Author: Dyks, L.A.
Paper Title Page
MOPOPT046 Linearity and Response Time of the LHC Diamond Beam Loss Monitors in the CLEAR Beam Test Facility at CERN 355
SUSPMF092   use link to see paper's listing under its alternate paper code  
 
  • S. Morales Vigo, E. Calvo Giraldo, L.A. Dyks, E. Effinger, W. Farabolini, P. Korysko, A.T. Lernevall, B. Salvachúa, C. Zamantzas
    CERN, Meyrin, Switzerland
  • S. Morales Vigo, C.P. Welsch, J. Wolfenden
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Chemical Vapour Deposition (CVD) diamond detectors have been tested during the Run 2 operation period (2015-2018) as fast beam loss monitors for the Beam Loss Monitoring (BLM) system of the Large Hadron Collider (LHC) at CERN. However, the lack of raw data recorded during this operation period restrains our ability to perform a deep analysis of their signals. For this reason, a test campaign was carried out at the CLEAR beam test facility at CERN with the aim of studying the linearity and response time of the diamond detectors against losses from electron beams of different intensities. The signal build-up from multi-bunched electron beams was also analyzed. The conditions and procedures of the test campaign are explained, as well as the most significant results obtained.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOPT046  
About • Received ※ 08 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 07 July 2022  
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THPOST018 The Design of a Second Beamline for the CLEAR User Facility at CERN 2479
 
  • 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
 
  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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST018  
About • Received ※ 07 June 2022 — Revised ※ 16 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 19 June 2022
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THPOMS030 Updates, Status and Experiments of CLEAR, the CERN Linear Electron Accelerator for Research 3022
 
  • 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
 
  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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS030  
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
 
  • 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
 
  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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS031  
About • Received ※ 08 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 06 July 2022
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THPOMS029 Testing the Properties of Beam-Dose Monitors for VHEE-FLASH Radiation Therapy 3018
 
  • 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
 
  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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS029  
About • Received ※ 08 June 2022 — Revised ※ 12 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 16 June 2022
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THPOST019 Generation of Transversely Uniform Bunches from a Gaussian Laser Spot in a Photoinjector for Irradiation Experiments 2483
 
  • 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
 
  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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST019  
About • Received ※ 07 June 2022 — Revised ※ 12 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 16 June 2022
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