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MOPOPT053 |
A Beam Position Monitor for Electron Bunch Detection in the Presence of a More Intense Proton Bunch for the AWAKE Experiment |
381 |
SUSPMF095 |
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- C. Pakuza, P. Burrows
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
- P. Burrows, C. Pakuza
JAI, Oxford, United Kingdom
- R. Corsini, W. Farabolini, P. Korysko, M. Krupa, T. Lefèvre, S. Mazzoni, E. Senes, M. Wendt
CERN, Meyrin, Switzerland
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The Advanced Proton Driven Plasma Wakefield Experiment (AWAKE) at CERN uses 6 cm long proton bunches extracted from the Super Proton Synchrotron (SPS) at 400 GeV beam energy to drive high gradient plasma wakefields for the acceleration of electron bunches to 2 GeV within a 10 m length. Knowledge and control of the position of both copropagating beams is crucial for the operation of the experiment. Whilst the current electron beam position monitoring system at AWAKE can be used in the absence of the proton beam, the proton bunch signal dominates when both particle bunches are present simultaneously. A new technique based on the generation of Cherenkov diffraction radiation (ChDR) in a dielectric material placed in close proximity to the particle beam has been designed to exploit the large bunch length difference of the particle beams at AWAKE, 200 ps for protons versus a few ps for electrons, such that the electron signal dominates. Hence, this technique would allow for the position measurement of a short electron bunch in the presence of a more intense but longer proton bunch. The design considerations, numerical analysis and plans for tests at the CERN Linear Electron Accelerator for Research (CLEAR) facility are presented.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOPT053
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About • |
Received ※ 20 May 2022 — Revised ※ 09 June 2022 — Accepted ※ 10 June 2022 — Issue date ※ 17 June 2022 |
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THPOST018 |
The Design of a Second Beamline for the CLEAR User Facility at CERN |
2479 |
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- L.A. Dyks, R. Corsini, P. Korysko
CERN, Meyrin, Switzerland
- P. Burrows
JAI, Oxford, United Kingdom
- P. Burrows, P. Korysko
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
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The CERN Linear Electron Accelerator for Research (CLEAR) has been operating as a general user facility since 2017 providing beams for a wide range of user experiments. However, with its current optical layout, the beams available to users are not able to cover every request. To overcome this, a second experimental beamline has been proposed. In this paper we discuss the potential optics of the new line as well as detailing the hardware required for its construction. Branching from the current beamline, via a dogleg chicane that could be used for bunch compression, the new beamline would provide an additional in-air test stand to be available to users. The beamline before the test stand would utilise large aperture quadrupoles to allow the irradiation of large target areas or strong focussing of beams onto a target. In addition to this there would also be further in-vacuum space to install experiments.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST018
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About • |
Received ※ 07 June 2022 — Revised ※ 16 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 19 June 2022 |
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THPOST019 |
Generation of Transversely Uniform Bunches from a Gaussian Laser Spot in a Photoinjector for Irradiation Experiments |
2483 |
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- L.A. Dyks, P. Burrows
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
- P. Burrows
JAI, Oxford, United Kingdom
- R. Corsini, A. Latina
CERN, Meyrin, Switzerland
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Beams of uniform transverse beam profile are desirable for a variety of applications such as irradiation experiments. The generation of beams with such profiles has previously been investigated as a method of reducing emittance growth. These methods, however, often use complicated optics setups or short, femtosecond laser pulse lengths. In this paper, we demonstrate that if ultra low emittance is not the target of the photoinjector, it is possible to produce transversely uniform beam profiles using a simple Gaussian laser, with a bunch length of a few picoseconds, utilising space-charge effects only.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST019
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About • |
Received ※ 07 June 2022 — Revised ※ 12 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 16 June 2022 |
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THPOMS029 |
Testing the Properties of Beam-Dose Monitors for VHEE-FLASH Radiation Therapy |
3018 |
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- J.J. Bateman, P. Burrows, L.A. Dyks
JAI, Oxford, United Kingdom
- R. Corsini, M. Dosanjh, W. Farabolini, A. Gerbershagen, N. Heracleous, P. Korysko, S. Morales Vigo, V. Rieker, B. Salvachúa, M. Silari, G. Zorloni
CERN, Meyrin, Switzerland
- F. Murtas
LNF-INFN, Frascati, Italy
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Very High Energy Electrons (VHEE) of 50 - 250 MeV are an attractive choice for FLASH radiation therapy (RT). Before VHEE-FLASH RT can be considered for clinical use, a reliable dosimetric and beam monitoring system needs to be developed, able to measure the dose delivered to the patient in real-time and cut off the beam in the event of a machine fault to prevent overdosing the patient. Ionisation chambers are the standard monitors in conventional RT; however, their response saturates at the high dose rates required for FLASH. Therefore, a new dosimetry method is needed that can provide reliable measurements of the delivered dose in these conditions. Experiments using 200 MeV electrons were done at the CLEAR facility at CERN to investigate the properties of detectors such as diamond beam loss detectors, GEM foil detectors, and Timepix3 ASIC chips. From the tests, the GEM foil proved to be the most promising.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS029
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About • |
Received ※ 08 June 2022 — Revised ※ 12 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 16 June 2022 |
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THPOMS030 |
Updates, Status and Experiments of CLEAR, the CERN Linear Electron Accelerator for Research |
3022 |
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- P. Korysko
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
- J.J. Bateman, C.S. Robertson
JAI, Oxford, United Kingdom
- R. Corsini, M. Dosanjh, L.A. Dyks, A. Gilardi, V. Rieker
CERN, Meyrin, Switzerland
- W. Farabolini
CEA-DRF-IRFU, France
- K.N. Sjobak
University of Oslo, Oslo, Norway
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The CERN Linear Accelerator for Research (CLEAR) at CERN is a test facility using a 200 MeV electron beam. In 2020 and 2021, a few hardware upgrades were done: comparators for position measurements were added on components, the in-air experimental area was re-arranged in order to provide more space, a robotic system was built to enable remote samples manipulations for irradiation studies, the BPM reading system was optimized and the laser double-bunch system implemented to allow for a doubling of the electron bunch frequency from 1.5 GHz to 3 GHz. In the paper, we describe such improvements, we outline the experimental activities during 2021 and illustrate the diverse program for the next 4 years, including high doses’ irradiation studies for medical applications.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS030
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About • |
Received ※ 08 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 28 June 2022 |
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THPOMS031 |
VHEE High Dose Rate Dosimetry Studies in CLEAR |
3026 |
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- V. Rieker, R. Corsini, L.A. Dyks
CERN, Meyrin, Switzerland
- J.J. Bateman
JAI, Oxford, United Kingdom
- W. Farabolini
CEA-DRF-IRFU, France
- P. Korysko
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
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The 200 MeV electron beam of the CERN Linear Accelerator for Research (CLEAR) user facility at CERN has been intensively used to study the potential use of Very High Energy Electrons (VHEE) in cancer radiotherapy. In particular, irradiation tests have been performed in the high dose rate regime, which has gained a lot of interest for the so called FLASH biological effect, in which cancer cells are damaged while healthy tissue is largely spared. High dose rate dosimetry, though, poses a number of challenges: to validate standard or new methods of passive dosimetry, like radiochromic films and alanine pellets, and especially to develop new methods for real-time dosimetry since the normally used ionization chambers suffer from non-linear effects at high dose rates. In this paper we describe the results of experimental activities at CLEAR aimed at developing solid, high-dose rate dosimetry standards adapted to VHEE beams.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS031
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About • |
Received ※ 08 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 06 July 2022 |
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