Paper |
Title |
Page |
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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