IPAC2022 - List of Keywords (power-supply)

Paper	Title	Other Keywords	Page
MOPOST039	Algorithm to Mitigate Magnetic Hysteresis in Magnets with Unipolar Power Supplies	quadrupole, optics, ISAC, cyclotron	156
	J. Nasser, R.A. Baartman, O.K. Kester, S. Kiy, T. Planche, S.D. Rädel, O. Shelbaya TRIUMF, Vancouver, Canada
	Funding: National Research Council Canada The effects of hysteresis on the fields produced by magnetic lenses are not accounted for in TRIUMF’s models of the accelerators. Under certain conditions, such as quadrupoles with unipolar power supplies operating at low currents, these effects have introduced significant field errors with consequences upon tranverse tunes. To combat these uncertainties and make the fields more reproducible and stable, a technique new to TRIUMF has been implemented. This technique ramps the current cyclically about the desired setpoint to reach a reproducible field that is independent of its history. Results of magnetic measurements at TRIUMF using this technique are presented, as well as the expected improvements to the accuracy of the beam optics model, particularly for unipolar quadrupoles.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOST039
About •	Received ※ 03 June 2022 — Revised ※ 09 June 2022 — Accepted ※ 12 June 2022 — Issue date ※ 17 June 2022
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MOPOTK041	Magnetic Field Noise Search Using Turn-by-Turn Data at CESR	kicker, simulation, electron, synchrotron	553
	V. Khachatryan, J. Barley, M.H. Berry, A.T. Chapelain, D.L. Rubin, J.P. Shanks, S. Wang Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: The authors thank NSF PHYS-1416318 and DMR-1829070. A method for searching for magnetic field noise has been developed using the CESR beam turn-by-turn data. The technique is tested using Monte-Carlo samples and turn-by-turn real data with induced noise in one of the CESR magnets. We estimate the analysis sensitivity for the noise sources slower than 4 kHz (or 100 CESR-turns) with the current CESR BPM system on the level of 1 microradian or 0.2 Gs×m field integral. In this work we report the observed noise sources and the improvements achieved by applying this technique. Long-term, several hours, beam stability analysis is also performed using the same method.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOTK041
About •	Received ※ 07 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 27 June 2022
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MOPOMS048	Fast Trigger System for Beam Abort System in SuperKEKB	hardware, kicker, detector, MMI	754
	H. Ikeda, T. Mimashi, S. Nakamura, T. Oki, S. Sasaki KEK, Ibaraki, Japan
	In order to protect the hardware components of the de-tector and accelerator from sudden beam loss of high beam currents, the fast beam abort system is developed in the SuperKEKB. The previous abort system was not fast enough for sudden beam loss that caused QCS quench, and it gave a damage to the collimator and the Belle-II detector. A fast abort system is required to pre-venting such damage. The abort system consists of sev-eral sensors that generate interlock signal (the loss moni-tor, dose in the Bell-II detector, and the magnet failure etc.), optical cable system to transfer the interlock signal to central control room (CCR), the abort trigger signal generation system and the abort kicker. To reduce total time, we reduce transmission time from local control room to CCR by changing signal cable route. Since the interlock signal produced by magnet power supply was slow, we modified the magnet power supply. For more quick generation of abort trigger signal, we increased number of the abort gap. By these improvements, an average abort time is reduced from 31µsec to 25µsec. This improvement looks small, but it brought preventing the serious radiation damage to many hardware compo-nents. Detail of the system and result is presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOMS048
About •	Received ※ 08 June 2022 — Revised ※ 12 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 10 July 2022
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TUPOPT026	Design and Status of Fast Orbit Feedback System at SOLARIS	controls, feedback, storage-ring, hardware	1059
	G.W. Kowalski, K. Gula, R. Panaś, A.I. Wawrzyniak, J.J. Wiechecki NSRC SOLARIS, Kraków, Poland
	SOLARIS storage ring has been built with basic set of diagnostic and feedback systems. FOFB system, as much more advanced and not as critical for startup was envisioned as later addition to the design. Now, we are in the process of implementing this addition. The system’s workhorse is Instrumentation Technologies Libera Brilliance⁺ with its Fast Acquisition data path and customizable FPGA modules. Feedback algorithm running in hardware provides fast calculations and direct communication with fast power supplies. The hardware installation is almost finished with configuration and software works running in parallel. First measurements of response matrix and proof-of-concept tests were performed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOPT026
About •	Received ※ 08 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 30 June 2022
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TUPOTK052	Influence of a Positive Grid Biasing on RF System in J-PARC RCS	controls, acceleration, operation, vacuum	1336
	M. Yamamoto, M. Nomura, H. Okita, T. Shimada, F. Tamura JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan K. Hara, K. Hasegawa, C. Ohmori, Y. Sugiyama, M. Yoshii KEK, Tokai, Ibaraki, Japan
	In order to accelerate a high intensity beam in the RCS, a large amplitude of the anode current is provided by a tube amplifier to compensate a heavy beam loading. Tetrode vacuum tubes are used in the RCS, and the control grid voltage enters into a positive region to feed such a large current. The positive grid biasing affects the waveform of the control grid voltage; it is deformed due to the induced control grid current under the condition of the multi-harmonic rf driving. Furthermore, the DC bias voltage drop on the control grid is observed because of the exceeding the ability for the control grid power supply. We describe the influence of the positive grid biasing in the RCS.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOTK052
About •	Received ※ 06 June 2022 — Revised ※ 17 June 2022 — Accepted ※ 22 June 2022 — Issue date ※ 24 June 2022
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TUPOTK058	Development and Testing of High Power CW 1497 MHz Magnetron	cathode, cavity, electron, simulation	1351
	M. Popovic, M.A. Cummings, A. Dudas, R.P. Johnson, R.R. Lentz, M.L. Neubauer, T. Wynn Muons, Inc, Illinois, USA T. Blassick, J.K. Wessel Richardson Electronics Ltd, Lafox, Illinois, USA K. Jordan, R.A. Rimmer, H. Wang JLab, Newport News, Virginia, USA
	Funding: Work supported by DOE NP STTR grant DE-SC0013203 We have designed, built, and tested a new magnetron tube that generates RF power at 1497 MHz. In the tests so far, the tube has produced CW 9 kW RF power, where the measured power is limited by the test equipment. The final goal is to use it to power superconducting (SC) cavities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOTK058
About •	Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 27 June 2022 — Issue date ※ 06 July 2022
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WEPOTK004	Status and Upgrade Plan of the MR Ring RF Systems in J-PARC	cavity, operation, proton, experiment	2031
	K. Hasegawa, K. Hara, C. Ohmori, Y. Sugiyama, M. Yoshii KEK, Ibaraki, Japan M. Nomura, H. Okita, T. Shimada, F. Tamura, M. Yamamoto JAEA/J-PARC, Tokai-mura, Japan
	The J-PARC Main Ring (MR) is a high intensity proton accelerator and delivers 30 GeV proton beams for the long-base line neutrino experiment and the hadron experiments. At present, the beam intensity supplied to the neutrino experiment reached 520 kW with a cycle time of 2.48 s. Toward the design beam power of 750 kW and future goal of 1.3 MW, we chose shortening the MR operation cycle. Accelerating time is shortened in order to shorten the cycle, so a high accelerating voltage is required. Therefore, it is necessary to upgrade the RF systems. This RF upgrade expands the current nine RF systems to a total of thirteen. We are planning to fabricate four RF power sources and add four additional cavities that are recombined with existing cavities. The present status and upgrade plan of the MR RF systems are reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOTK004
About •	Received ※ 08 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 23 June 2022 — Issue date ※ 07 July 2022
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WEPOTK024	Upgrade of Septum Magnets for Fast Extraction in J-Parc Main Ring	septum, operation, extraction, vacuum	2103
	S. Iwata, K. Ishii, H. Matsumoto, N. Matsumoto, Y. Sato, T. Shibata, T. Sugimoto, M. Uota KEK, Tokai, Ibaraki, Japan
	We aim to supply a high-power proton beam of 1.3 MW to the neutrino facility from J-PARC Main Ring (MR) by shortening the repetition cycle to 1.16 s from 2.48 s and increasing the number of particles by 30%. The six sep-tum magnets for fast extraction (FX) need to be replaced to reduce the heat that is generated as a result of shorten-ing the repetition cycle. The replacement of the septum magnets began in July 2021 and was completed at the end of May 2022. The beam commissioning starts in June 2022. We report the details of the replacement work and operation test of the new septum magnets. We found a defect in the magnetic coil of the septum (SM32) in August 2021. We decided to postpone its installation to around August 2022 and produce new magnet coils for the SM32. The beam extraction in June 2022 will be per-formed using a temporary vacuum duct instead of the SM32 magnet, and the extraction beam orbit will be maintained by increasing the magnetic field of the other five septum magnets.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOTK024
About •	Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 10 July 2022
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THOYSP2	The New Eddy Current Type Septum Magnet for Upgrading of Fast Extraction in Main Ring of J-PARC	septum, extraction, operation, injection	2428
	T. Shibata, K. Ishii, S. Iwata, H. Matsumoto, T. Sugimoto KEK, Ibaraki, Japan K. Fan HUST, Wuhan, People’s Republic of China
	For our first goal of the beam power of Main Ring for Fast eXtraction (FX), 750 kW, we have been evaluating a new Low-Field FX Septum magnets which are induced eddy current type (Eddy-Septum) since 2014. The pending technical issues are disagreement in two current monitor systems and the long switching time of the Main-charger to Sub-charger at low charging voltage. We measured a gap field during measurement of current, and found no drift in time variation of gap field. Our conclusion was that the cause of the disagreement is electric and radiative noise which make the drift in the time variation. The long-term stability of the output pulsed current depends on the switching time and charging voltage. We investigated the correlation between the keeping time of flat-top charging voltage and long-time stability with various charging voltages. In June 2021, we have first conducted the 1 Hz operation and high-voltage test of the Eddy-Septum which is mounted in a vacuum chamber, and we found no problem. A new pure iron duct type magnetic shield for reducing the leakage field were produced in July 2021. The new LF FX-Septum will be installed in MR in early of 2022.
	Slides THOYSP2 [5.375 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THOYSP2
About •	Received ※ 20 May 2022 — Revised ※ 11 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 21 June 2022
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THPOST048	RHIC Machine Protection System Upgrades	detector, kicker, operation, monitoring	2548
	M. Valette, D. Bruno, K.A. Drees, P.S. Dyer, R.L. Hulsart, J.S. Laster, J. Morris, G. Robert-Demolaize, J. Sandberg, C. Schultheiss, T.C. Shrey, G.M. Tustin BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. ’In order to protect the future sPHENIX detector from spontaneous and asynchronous firing of one of the five RHIC abort kickers, mechanical relays were added to the triggering channel for each of them. The mechanical relays add several milliseconds to the delay between the detection of a failure or beam loss and the beam being safely disposed of. In order to account for this delay new inputs were included into the RHIC Machine Protection System to ensure detection of abnormal conditions as early as possible. These inputs include system diagnostics and beam measurements such as Beam Position Monitor signals. In this paper we detail the upgrades that will allow reliable operations with high intensity and high energy ion beams and the new detector as well as related operational challenges and how they were addressed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST048
About •	Received ※ 08 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 16 June 2022
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THPOPT010	Beam Loss Reduction During Energy Ramp-Up at the SAGA-LS	storage-ring, acceleration, quadrupole, sextupole	2583
	Y. Iwasaki SAGA, Tosu, Japan
	The accelerator of the SAGA Light Source (SAGA-LS) consists of a 255 MeV injector linac and a 1.4 GeV storage ring. The energy of the electrons is ramped up to 1.4 GeV in 4 minutes in the storage ring. The electron beam current stored in the storage ring is about 300 mA. At the begging of the energy ramp-up, the electron beam was lost like step function. The lost beam current was normally about 5 mA to 30 mA. To understand the beam loss mechanism, we developed simultaneous image logging system of beam profile in addition to the beam current, the magnets power supplies, and the beam positions using National Instruments PXI. It was found that the vertical beam size was growing in the step-like beam loss process. The small perturbation of the output currents of the quadrupole power supplies caused the vertical beam size growth. By optimizing the ramp-up pattern of the quadrupole power supplies, sextupole power supplies, and the steering power supplies for the orbit control, we have achieved the reduction of the step-like beam loss and total time of the ramp-up.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT010
About •	Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 28 June 2022
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THPOPT017	Orbit Stability Studies for the Diamond-II Storage Ring	electron, storage-ring, cavity, resonance	2602
	I.P.S. Martin, C.A. Abraham, D. Crivelli, H. Ghasem, B. Nicholson, T. Olsson, P. Sanchez Navarro DLS, Oxfordshire, United Kingdom
	The photon-beam positional stability relative to the beam size is a key performance parameter for storage ring light sources. The natural emittance of the Diamond-II ring will be lowered by a factor 16.7 compared to the existing ring, so the absolute stability requirement for the electron beam must reduce accordingly. In addition, advances in detector speed and resolution mean the tolerances are tighter compared to previous generations of storage rings, with a target of 3 % of beam size up to 1 kHz having been adopted for Diamond-II. In this paper we present studies of how the anticipated ground vibrations, girder motion and power supply ripple will affect the electron beam stability as a function of frequency.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT017
About •	Received ※ 08 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 06 July 2022
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THPOPT031	SUNDAE1: A Liquid Helium Vertical Test-Stand for 2m Long Superconducting Undulator Coils	undulator, FEL, photon, experiment	2646
	B. Marchetti, S. Abeghyan, J.E. Baader, S. Casalbuoni, M. Di Felice, U. Englisch, V. Grattoni, D. La Civita, M. Vannoni, M. Yakopov, P. Ziolkowski EuXFEL, Schenefeld, Germany S. Barbanotti, H.-J. Eckoldt, A. Hauberg, K. Jensch, S. Lederer, L. Lilje, R. Ramalingam, T. Schnautz, R. Zimmermann DESY, Hamburg, Germany A.W. Grau KIT, Karlsruhe, Germany
	Superconducting Undulators (SCUs) can produce higher photon flux and cover a wider photon energy range compared to permanent magnet undulators (PMUs) with the same vacuum gap and period length. To build the know-how to implement superconducting undulators for future upgrades of the European XFEL facility, two magnetic measurement test stands named SUNDAE 1 and 2 (Superconducting UNDulAtor Experiment) are being developed. SUNDAE1 will facilitate research and development on magnet design thanks to the possibility of training new SCU coils and characterizing their magnetic field. The experimental setup will allow the characterization of magnets up to 2m in length. These magnets will be immersed in a Helium bath at 2K or 4K temperature. In this article, we describe the experimental setup and highlight its expected performances.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT031
About •	Received ※ 03 June 2022 — Revised ※ 17 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 17 June 2022
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THPOPT041	Commissioning of New Kicker Power Supplies to Improve Injection Perturbations at the ESRF	injection, kicker, SRF, storage-ring	2683
	S.M. White, N. Carmignani, L.R. Carver, M. Dubrulle, L. Hoummi, M. Morati, T.P. Perron, B. Roche ESRF, Grenoble, France
	The ESRF-EBS storage ring resumed operation in 2020. Due to the reduced lifetime, top-up injection is required for all operation modes. Perturbations on the stored beam introduced by the pulsed injection elements represent a significant disturbance to the beam lines that need to run experiments across injection. In order to reduce these perturbation, new kicker power supplies with slower ramping times and better shot-to-shot reproducibility were developed at ESRF to improve the efficiency of the feed-forward compensation scheme. This paper reports on the design, commissioning and first experimental validation of these new power supplies.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT041
About •	Received ※ 07 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 01 July 2022
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THPOTK015	Solid-State Pulsed Power Supply for a 100 keV Electron Source of the New Synchrotron Facility in Thailand	electron, gun, high-voltage, simulation	2803
	W. Phacheerak, S. Bootiew, T. Chanwattana, Ch. Dhammatong, N. Juntong, K. Kittimanapun SLRI, Nakhon Ratchasima, Thailand K. Manasatitpong Synchrotron Light Research Institute (SLRI), Muang District, Thailand
	The new synchrotron light source project in Thailand will utilize a thermionic DC electron gun. The maximum operation of the gun is 100 keV, which requires a pulsed power supply of 100kV. The present synchrotron machine uses a conventional design of the gun power supply. To improve the high voltage pulsed quality, the solid-state design of the gun power supply is utilized. The output pulse width can be adjusted easily and the droop is less compared to the conventional design. The designed output of 100 kV amplitude with 5 µs pulsed width can be achieved with this design. It also produces a less droop of 1.8%. The design process and results will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOTK015
About •	Received ※ 08 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 26 June 2022
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THPOTK019	Collider NICA Power Supply Magnet System	collider, controls, superconducting-magnet, focusing	2806
	V. Karpinsky, R.M. Ahmadrizyalov, S.A. Arefev, A.V. Butenko, A.V. Karavaev, S.V. Kirov, A.V. Kopchenov, A.A. Kozlykovskaya, T.A. Kulaeva, A.L. Osipenkov, A.V. Sergeev, A.A. Shurygin, E. Syresin, V.G. Tovstuha, N.V. Travin JINR, Dubna, Moscow Region, Russia M.I. Kuznetsov JINR/VBLHEP, Dubna, Moscow region, Russia
	A power supply system for Collider structural magnets is considered, which consists of precision current sources, energy evacuation devices for superconducting elements, additional sources, and control and monitoring equipment. The status of the equipment and the plan of its placement in Collider bld. 17 are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOTK019
About •	Received ※ 02 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 07 July 2022
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THPOMS013	Electron Gun System Design for FLASH Radiotherapy	electron, gun, cathode, radiation	2970
	H.-S. Lee, J.H. Jang, K.Y. Jang, J.C. Koo, H.S. Shin, D.H. Yu VITZRONEXTECH, Ansan-si, Gyeonggi-do, Republic of Korea D.H. An, S.H. Choi, K.U. Kang, G.B. Kim, J.H. Kim KIRAMS, Seoul, Republic of Korea Y.G. Son PAL, Pohang, Republic of Korea
	An electron gun is a device that emits electron beams used in an electron accelerator, an electron beam welder, an x-ray generator, etc. This device can be broadly divided into three components: a cathode, a grid, and an anode. A medical electron gun, which is a sub-system of an electron accelerator for FLASH radiotherapy, requires a high current. The electron gun was designed to obtain a peak current up to 15A using EIMAC Y824 cathode. We would like to introduce the structure of the electron gun and the required power supply system. In this paper, we will describe the optimization process of the electron gun structure design, the Marx-type power supply providing 200 kV pulse voltage, and the grid pulse power supply ranging from 1ns to 1.5 ’s. Electron gun design, Accelerator, Radiotherapy, High Current
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS013
About •	Received ※ 08 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 28 June 2022 — Issue date ※ 10 July 2022
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Paper

Title

Other Keywords

Page

MOPOST039

Algorithm to Mitigate Magnetic Hysteresis in Magnets with Unipolar Power Supplies

quadrupole, optics, ISAC, cyclotron

156

J. Nasser, R.A. Baartman, O.K. Kester, S. Kiy, T. Planche, S.D. Rädel, O. Shelbaya
TRIUMF, Vancouver, Canada

Funding: National Research Council Canada
The effects of hysteresis on the fields produced by magnetic lenses are not accounted for in TRIUMF’s models of the accelerators. Under certain conditions, such as quadrupoles with unipolar power supplies operating at low currents, these effects have introduced significant field errors with consequences upon tranverse tunes. To combat these uncertainties and make the fields more reproducible and stable, a technique new to TRIUMF has been implemented. This technique ramps the current cyclically about the desired setpoint to reach a reproducible field that is independent of its history. Results of magnetic measurements at TRIUMF using this technique are presented, as well as the expected improvements to the accuracy of the beam optics model, particularly for unipolar quadrupoles.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOST039

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Received ※ 03 June 2022 — Revised ※ 09 June 2022 — Accepted ※ 12 June 2022 — Issue date ※ 17 June 2022

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MOPOTK041

Magnetic Field Noise Search Using Turn-by-Turn Data at CESR

kicker, simulation, electron, synchrotron

553

V. Khachatryan, J. Barley, M.H. Berry, A.T. Chapelain, D.L. Rubin, J.P. Shanks, S. Wang
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: The authors thank NSF PHYS-1416318 and DMR-1829070.
A method for searching for magnetic field noise has been developed using the CESR beam turn-by-turn data. The technique is tested using Monte-Carlo samples and turn-by-turn real data with induced noise in one of the CESR magnets. We estimate the analysis sensitivity for the noise sources slower than 4 kHz (or 100 CESR-turns) with the current CESR BPM system on the level of 1 microradian or 0.2 Gs×m field integral. In this work we report the observed noise sources and the improvements achieved by applying this technique. Long-term, several hours, beam stability analysis is also performed using the same method.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOTK041

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Received ※ 07 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 27 June 2022

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MOPOMS048

Fast Trigger System for Beam Abort System in SuperKEKB

hardware, kicker, detector, MMI

754

H. Ikeda, T. Mimashi, S. Nakamura, T. Oki, S. Sasaki
KEK, Ibaraki, Japan

In order to protect the hardware components of the de-tector and accelerator from sudden beam loss of high beam currents, the fast beam abort system is developed in the SuperKEKB. The previous abort system was not fast enough for sudden beam loss that caused QCS quench, and it gave a damage to the collimator and the Belle-II detector. A fast abort system is required to pre-venting such damage. The abort system consists of sev-eral sensors that generate interlock signal (the loss moni-tor, dose in the Bell-II detector, and the magnet failure etc.), optical cable system to transfer the interlock signal to central control room (CCR), the abort trigger signal generation system and the abort kicker. To reduce total time, we reduce transmission time from local control room to CCR by changing signal cable route. Since the interlock signal produced by magnet power supply was slow, we modified the magnet power supply. For more quick generation of abort trigger signal, we increased number of the abort gap. By these improvements, an average abort time is reduced from 31µsec to 25µsec. This improvement looks small, but it brought preventing the serious radiation damage to many hardware compo-nents. Detail of the system and result is presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOMS048

About •

Received ※ 08 June 2022 — Revised ※ 12 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 10 July 2022

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TUPOPT026

Design and Status of Fast Orbit Feedback System at SOLARIS

controls, feedback, storage-ring, hardware

1059

G.W. Kowalski, K. Gula, R. Panaś, A.I. Wawrzyniak, J.J. Wiechecki
NSRC SOLARIS, Kraków, Poland

SOLARIS storage ring has been built with basic set of diagnostic and feedback systems. FOFB system, as much more advanced and not as critical for startup was envisioned as later addition to the design. Now, we are in the process of implementing this addition. The system’s workhorse is Instrumentation Technologies Libera Brilliance⁺ with its Fast Acquisition data path and customizable FPGA modules. Feedback algorithm running in hardware provides fast calculations and direct communication with fast power supplies. The hardware installation is almost finished with configuration and software works running in parallel. First measurements of response matrix and proof-of-concept tests were performed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOPT026

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Received ※ 08 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 30 June 2022

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TUPOTK052

Influence of a Positive Grid Biasing on RF System in J-PARC RCS

controls, acceleration, operation, vacuum

1336

M. Yamamoto, M. Nomura, H. Okita, T. Shimada, F. Tamura
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
K. Hara, K. Hasegawa, C. Ohmori, Y. Sugiyama, M. Yoshii
KEK, Tokai, Ibaraki, Japan

In order to accelerate a high intensity beam in the RCS, a large amplitude of the anode current is provided by a tube amplifier to compensate a heavy beam loading. Tetrode vacuum tubes are used in the RCS, and the control grid voltage enters into a positive region to feed such a large current. The positive grid biasing affects the waveform of the control grid voltage; it is deformed due to the induced control grid current under the condition of the multi-harmonic rf driving. Furthermore, the DC bias voltage drop on the control grid is observed because of the exceeding the ability for the control grid power supply. We describe the influence of the positive grid biasing in the RCS.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOTK052

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Received ※ 06 June 2022 — Revised ※ 17 June 2022 — Accepted ※ 22 June 2022 — Issue date ※ 24 June 2022

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TUPOTK058

Development and Testing of High Power CW 1497 MHz Magnetron

cathode, cavity, electron, simulation

1351

M. Popovic, M.A. Cummings, A. Dudas, R.P. Johnson, R.R. Lentz, M.L. Neubauer, T. Wynn
Muons, Inc, Illinois, USA
T. Blassick, J.K. Wessel
Richardson Electronics Ltd, Lafox, Illinois, USA
K. Jordan, R.A. Rimmer, H. Wang
JLab, Newport News, Virginia, USA

Funding: Work supported by DOE NP STTR grant DE-SC0013203
We have designed, built, and tested a new magnetron tube that generates RF power at 1497 MHz. In the tests so far, the tube has produced CW 9 kW RF power, where the measured power is limited by the test equipment. The final goal is to use it to power superconducting (SC) cavities.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOTK058

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Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 27 June 2022 — Issue date ※ 06 July 2022

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WEPOTK004

Status and Upgrade Plan of the MR Ring RF Systems in J-PARC

cavity, operation, proton, experiment

2031

K. Hasegawa, K. Hara, C. Ohmori, Y. Sugiyama, M. Yoshii
KEK, Ibaraki, Japan
M. Nomura, H. Okita, T. Shimada, F. Tamura, M. Yamamoto
JAEA/J-PARC, Tokai-mura, Japan

The J-PARC Main Ring (MR) is a high intensity proton accelerator and delivers 30 GeV proton beams for the long-base line neutrino experiment and the hadron experiments. At present, the beam intensity supplied to the neutrino experiment reached 520 kW with a cycle time of 2.48 s. Toward the design beam power of 750 kW and future goal of 1.3 MW, we chose shortening the MR operation cycle. Accelerating time is shortened in order to shorten the cycle, so a high accelerating voltage is required. Therefore, it is necessary to upgrade the RF systems. This RF upgrade expands the current nine RF systems to a total of thirteen. We are planning to fabricate four RF power sources and add four additional cavities that are recombined with existing cavities. The present status and upgrade plan of the MR RF systems are reported.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOTK004

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Received ※ 08 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 23 June 2022 — Issue date ※ 07 July 2022

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WEPOTK024

Upgrade of Septum Magnets for Fast Extraction in J-Parc Main Ring

septum, operation, extraction, vacuum

2103

S. Iwata, K. Ishii, H. Matsumoto, N. Matsumoto, Y. Sato, T. Shibata, T. Sugimoto, M. Uota
KEK, Tokai, Ibaraki, Japan

We aim to supply a high-power proton beam of 1.3 MW to the neutrino facility from J-PARC Main Ring (MR) by shortening the repetition cycle to 1.16 s from 2.48 s and increasing the number of particles by 30%. The six sep-tum magnets for fast extraction (FX) need to be replaced to reduce the heat that is generated as a result of shorten-ing the repetition cycle. The replacement of the septum magnets began in July 2021 and was completed at the end of May 2022. The beam commissioning starts in June 2022. We report the details of the replacement work and operation test of the new septum magnets. We found a defect in the magnetic coil of the septum (SM32) in August 2021. We decided to postpone its installation to around August 2022 and produce new magnet coils for the SM32. The beam extraction in June 2022 will be per-formed using a temporary vacuum duct instead of the SM32 magnet, and the extraction beam orbit will be maintained by increasing the magnetic field of the other five septum magnets.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOTK024

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Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 10 July 2022

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THOYSP2

The New Eddy Current Type Septum Magnet for Upgrading of Fast Extraction in Main Ring of J-PARC

septum, extraction, operation, injection

2428

T. Shibata, K. Ishii, S. Iwata, H. Matsumoto, T. Sugimoto
KEK, Ibaraki, Japan
K. Fan
HUST, Wuhan, People’s Republic of China

For our first goal of the beam power of Main Ring for Fast eXtraction (FX), 750 kW, we have been evaluating a new Low-Field FX Septum magnets which are induced eddy current type (Eddy-Septum) since 2014. The pending technical issues are disagreement in two current monitor systems and the long switching time of the Main-charger to Sub-charger at low charging voltage. We measured a gap field during measurement of current, and found no drift in time variation of gap field. Our conclusion was that the cause of the disagreement is electric and radiative noise which make the drift in the time variation. The long-term stability of the output pulsed current depends on the switching time and charging voltage. We investigated the correlation between the keeping time of flat-top charging voltage and long-time stability with various charging voltages. In June 2021, we have first conducted the 1 Hz operation and high-voltage test of the Eddy-Septum which is mounted in a vacuum chamber, and we found no problem. A new pure iron duct type magnetic shield for reducing the leakage field were produced in July 2021. The new LF FX-Septum will be installed in MR in early of 2022.

Slides THOYSP2 [5.375 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THOYSP2

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Received ※ 20 May 2022 — Revised ※ 11 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 21 June 2022

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THPOST048

RHIC Machine Protection System Upgrades

detector, kicker, operation, monitoring

2548

M. Valette, D. Bruno, K.A. Drees, P.S. Dyer, R.L. Hulsart, J.S. Laster, J. Morris, G. Robert-Demolaize, J. Sandberg, C. Schultheiss, T.C. Shrey, G.M. Tustin
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
’In order to protect the future sPHENIX detector from spontaneous and asynchronous firing of one of the five RHIC abort kickers, mechanical relays were added to the triggering channel for each of them. The mechanical relays add several milliseconds to the delay between the detection of a failure or beam loss and the beam being safely disposed of. In order to account for this delay new inputs were included into the RHIC Machine Protection System to ensure detection of abnormal conditions as early as possible. These inputs include system diagnostics and beam measurements such as Beam Position Monitor signals. In this paper we detail the upgrades that will allow reliable operations with high intensity and high energy ion beams and the new detector as well as related operational challenges and how they were addressed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST048

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Received ※ 08 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 16 June 2022

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THPOPT010

Beam Loss Reduction During Energy Ramp-Up at the SAGA-LS

storage-ring, acceleration, quadrupole, sextupole

2583

Y. Iwasaki
SAGA, Tosu, Japan

The accelerator of the SAGA Light Source (SAGA-LS) consists of a 255 MeV injector linac and a 1.4 GeV storage ring. The energy of the electrons is ramped up to 1.4 GeV in 4 minutes in the storage ring. The electron beam current stored in the storage ring is about 300 mA. At the begging of the energy ramp-up, the electron beam was lost like step function. The lost beam current was normally about 5 mA to 30 mA. To understand the beam loss mechanism, we developed simultaneous image logging system of beam profile in addition to the beam current, the magnets power supplies, and the beam positions using National Instruments PXI. It was found that the vertical beam size was growing in the step-like beam loss process. The small perturbation of the output currents of the quadrupole power supplies caused the vertical beam size growth. By optimizing the ramp-up pattern of the quadrupole power supplies, sextupole power supplies, and the steering power supplies for the orbit control, we have achieved the reduction of the step-like beam loss and total time of the ramp-up.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT010

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Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 28 June 2022

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THPOPT017

Orbit Stability Studies for the Diamond-II Storage Ring

electron, storage-ring, cavity, resonance

2602

I.P.S. Martin, C.A. Abraham, D. Crivelli, H. Ghasem, B. Nicholson, T. Olsson, P. Sanchez Navarro
DLS, Oxfordshire, United Kingdom

The photon-beam positional stability relative to the beam size is a key performance parameter for storage ring light sources. The natural emittance of the Diamond-II ring will be lowered by a factor 16.7 compared to the existing ring, so the absolute stability requirement for the electron beam must reduce accordingly. In addition, advances in detector speed and resolution mean the tolerances are tighter compared to previous generations of storage rings, with a target of 3 % of beam size up to 1 kHz having been adopted for Diamond-II. In this paper we present studies of how the anticipated ground vibrations, girder motion and power supply ripple will affect the electron beam stability as a function of frequency.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT017

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Received ※ 08 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 06 July 2022

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THPOPT031

SUNDAE1: A Liquid Helium Vertical Test-Stand for 2m Long Superconducting Undulator Coils

undulator, FEL, photon, experiment

2646

B. Marchetti, S. Abeghyan, J.E. Baader, S. Casalbuoni, M. Di Felice, U. Englisch, V. Grattoni, D. La Civita, M. Vannoni, M. Yakopov, P. Ziolkowski
EuXFEL, Schenefeld, Germany
S. Barbanotti, H.-J. Eckoldt, A. Hauberg, K. Jensch, S. Lederer, L. Lilje, R. Ramalingam, T. Schnautz, R. Zimmermann
DESY, Hamburg, Germany
A.W. Grau
KIT, Karlsruhe, Germany

Superconducting Undulators (SCUs) can produce higher photon flux and cover a wider photon energy range compared to permanent magnet undulators (PMUs) with the same vacuum gap and period length. To build the know-how to implement superconducting undulators for future upgrades of the European XFEL facility, two magnetic measurement test stands named SUNDAE 1 and 2 (Superconducting UNDulAtor Experiment) are being developed. SUNDAE1 will facilitate research and development on magnet design thanks to the possibility of training new SCU coils and characterizing their magnetic field. The experimental setup will allow the characterization of magnets up to 2m in length. These magnets will be immersed in a Helium bath at 2K or 4K temperature. In this article, we describe the experimental setup and highlight its expected performances.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT031

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Received ※ 03 June 2022 — Revised ※ 17 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 17 June 2022

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THPOPT041

Commissioning of New Kicker Power Supplies to Improve Injection Perturbations at the ESRF

injection, kicker, SRF, storage-ring

2683

S.M. White, N. Carmignani, L.R. Carver, M. Dubrulle, L. Hoummi, M. Morati, T.P. Perron, B. Roche
ESRF, Grenoble, France

The ESRF-EBS storage ring resumed operation in 2020. Due to the reduced lifetime, top-up injection is required for all operation modes. Perturbations on the stored beam introduced by the pulsed injection elements represent a significant disturbance to the beam lines that need to run experiments across injection. In order to reduce these perturbation, new kicker power supplies with slower ramping times and better shot-to-shot reproducibility were developed at ESRF to improve the efficiency of the feed-forward compensation scheme. This paper reports on the design, commissioning and first experimental validation of these new power supplies.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT041

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Received ※ 07 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 01 July 2022

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THPOTK015

Solid-State Pulsed Power Supply for a 100 keV Electron Source of the New Synchrotron Facility in Thailand

electron, gun, high-voltage, simulation

2803

W. Phacheerak, S. Bootiew, T. Chanwattana, Ch. Dhammatong, N. Juntong, K. Kittimanapun
SLRI, Nakhon Ratchasima, Thailand
K. Manasatitpong
Synchrotron Light Research Institute (SLRI), Muang District, Thailand

The new synchrotron light source project in Thailand will utilize a thermionic DC electron gun. The maximum operation of the gun is 100 keV, which requires a pulsed power supply of 100kV. The present synchrotron machine uses a conventional design of the gun power supply. To improve the high voltage pulsed quality, the solid-state design of the gun power supply is utilized. The output pulse width can be adjusted easily and the droop is less compared to the conventional design. The designed output of 100 kV amplitude with 5 µs pulsed width can be achieved with this design. It also produces a less droop of 1.8%. The design process and results will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOTK015

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Received ※ 08 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 26 June 2022

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THPOTK019

Collider NICA Power Supply Magnet System

collider, controls, superconducting-magnet, focusing

2806

V. Karpinsky, R.M. Ahmadrizyalov, S.A. Arefev, A.V. Butenko, A.V. Karavaev, S.V. Kirov, A.V. Kopchenov, A.A. Kozlykovskaya, T.A. Kulaeva, A.L. Osipenkov, A.V. Sergeev, A.A. Shurygin, E. Syresin, V.G. Tovstuha, N.V. Travin
JINR, Dubna, Moscow Region, Russia
M.I. Kuznetsov
JINR/VBLHEP, Dubna, Moscow region, Russia

A power supply system for Collider structural magnets is considered, which consists of precision current sources, energy evacuation devices for superconducting elements, additional sources, and control and monitoring equipment. The status of the equipment and the plan of its placement in Collider bld. 17 are presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOTK019

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Received ※ 02 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 07 July 2022

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THPOMS013

Electron Gun System Design for FLASH Radiotherapy

electron, gun, cathode, radiation

2970

H.-S. Lee, J.H. Jang, K.Y. Jang, J.C. Koo, H.S. Shin, D.H. Yu
VITZRONEXTECH, Ansan-si, Gyeonggi-do, Republic of Korea
D.H. An, S.H. Choi, K.U. Kang, G.B. Kim, J.H. Kim
KIRAMS, Seoul, Republic of Korea
Y.G. Son
PAL, Pohang, Republic of Korea

An electron gun is a device that emits electron beams used in an electron accelerator, an electron beam welder, an x-ray generator, etc. This device can be broadly divided into three components: a cathode, a grid, and an anode. A medical electron gun, which is a sub-system of an electron accelerator for FLASH radiotherapy, requires a high current. The electron gun was designed to obtain a peak current up to 15A using EIMAC Y824 cathode. We would like to introduce the structure of the electron gun and the required power supply system. In this paper, we will describe the optimization process of the electron gun structure design, the Marx-type power supply providing 200 kV pulse voltage, and the grid pulse power supply ranging from 1ns to 1.5 ’s.
Electron gun design, Accelerator, Radiotherapy, High Current

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS013

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Received ※ 08 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 28 June 2022 — Issue date ※ 10 July 2022

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