WE3 —  Wednesday Session 3   (14-Sep-22   16:30—18:00)
Chair: C. Kim, PAL, Pohang, Republic of Korea
Paper Title Page
WE3I1 Novel Fast Radiation-Hard Scintillation Detectors for Ion Beam Diagnostics 515
  • P. Boutachkov, M. Saifulin, C. Trautmann, B. Walasek-Höhne
    GSI, Darmstadt, Germany
  • E.I. Gorokhova
    GOI, St Petersburg, Russia
  • P. Rodnyi, I.D. Venevtsev
    SPbPU, St. Petersburg, Russia
  Novel radiation-hard scintillators were developed in the last years based on indium-doped ZnO ceramic with an extremely short decay time below a ns. Fast counting detectors and fast screens were considered as potential beam diagnostic applications of this material. At the GSI/FAIR facility, scintillation detectors are commonly used for measuring the intensity and detailed time structure of relativistic heavy ion beams. The scintillating material is inserted directly into the beam path. Signals from individual ions are counted, providing systematic-error-free beam intensity information. Standard scintillators require frequent maintenance due to radiation damage. To address this limitation, a large area ZnO radiation-hard detector was developed. The prototype detector operates at orders of magnitude higher irradiation levels, at higher counting rates and has better time resolution compared to a plastic scintillator. In addition, the novel detector material opens the possibilities for applications in other beam diagnostic systems, for example, scintillation screens for transverse profile measurements. Therefore, ZnO scintillation ceramics are of general interest for beam diagnostics.  
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slides icon Slides WE3I1 [15.046 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE3I1  
About • Received ※ 24 September 2022 — Revised ※ 24 October 2022 — Accepted ※ 25 October 2022 — Issue date ※ 27 November 2022
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WE3C2 Time-Resolved Proton Beam Dosimetry for Ultra-High Dose-Rate Cancer Therapy (FLASH) 519
  • P. Casolaro, S. Braccini, G. Dellepiane, A. Gottstein, I. Mateu, P. Scampoli
    AEC, Bern, Switzerland
  • P. Scampoli
    Naples University Federico II, Napoli, Italy
  Funding: This project was partially funded by the Bern Center for Precision Medicine (BCPM) of the University of Bern, and by the Swiss National Science Foundation (SNSF) [Grant: CRSII5180352]
A new radiotherapy modality, known as FLASH, is a potential breakthrough in cancer care as it features a reduced damage to healthy tissues, resulting in the enhancement of the clinical benefit. FLASH irradiations are characterized by ultra-high dose-rates (>40 Gy/s) delivered in fractions of a second. This represents a challenge in terms of beam diagnostics and dosimetry, as detectors used in conventional radiotherapy saturate or they are too slow for the FLASH regime. In view of the FLASH clinical translation, the development of new dosimeters is fundamental. Along this line, a research project is ongoing at the University of Bern aiming at setting-up new beam monitors and dosimeters for FLASH. The proposed detection system features millimeter scintillators coupled to optical fibers, transporting light pulses to a fast photodetector, readout by high bandwidth digitizers. First prototypes were exposed to the 18 MeV proton beam at the Bern medical cyclotron. The new detectors have been found to be linear in the range up to 780 Gy/s, with a maximum time resolution of 100 ns. These characteristics are promising for the development of a new class of detectors for FLASH radiotherapy.
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slides icon Slides WE3C2 [5.378 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE3C2  
About • Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 23 November 2022
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WE3C3 Fast Spill Monitor Studies for the SPS Fixed Target Beams 522
  • F. Roncarolo, P.A. Arrutia Sota, D. Belohrad, E. Calvo Giraldo, E. Effinger, M.A. Fraser, V. Kain, M. Martin Nieto, S. Mazzoni, I. Ortega Ruiz, J. Tan, F.M. Velotti, C. Zamantzas
    CERN, Meyrin, Switzerland
  • M. Bergamaschi
    MPI-P, München, Germany
  At the CERN Super Proton Synchrotron (SPS) the proton beam is supplied to the fixed target experiments in the North Area facility (NA) via a slow extraction process, taking place at 400 GeV. The monitoring of the spill quality during the extraction, lasting 4.8 seconds with the present SPS setup, is of high interest for minimising beam losses and providing the users with uniform proton-on-target rates. The monitor development challenges include the need for detecting, sampling, processing and publishing the data at rates ranging from few hundred Hz to support the present operation to several hundreds of MHz to serve future experiments proposed within the Physics Beyond Collider (PBC) programme. This paper will give an overview of the ongoing studies for optimizing the existing monitors performances and of the R&D dedicated to future developments. Different techniques are being explored, from Secondary Emission Monitors to Optical Transition Radiation (OTR), Gas Scintillation and Cherenkov detectors. Expected ultimate limitations from the various methods will be presented, together with 2022 experimental results, for example with a recently refurbished OTR detector.  
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slides icon Slides WE3C3 [2.339 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE3C3  
About • Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 26 November 2022
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WE3C4 Simulated Behavior of CNT Wires Irradiated in the HiRadMat Experimental Line at CERN 527
  • A. Mariet, B. Moser, R. Veness
    CERN, Meyrin, Switzerland
  • M. Devel, J.E. Groetz
    UFC, Besançon, France
  • A. Mikhalchan, J.J. Vilatela
    IMDEA, Madrid, Spain
  With the planned increase of luminosity at CERN for HL-LHC and FCC, instruments for beam quality control must meet new challenges. The current wires, made up of plain carbon fibers and gold-plated tungsten would be damaged due to their interactions with the higher luminosity beams. We are currently testing a new and innovative material, with improved performance: carbon nanotube fibers (CNTF). The HiRadMat (High Radiation for Material) experimental line at the output of the SPS is a user facility which can irradiate fix targets up to 440 GeV/c. CNTF with various diameters were irradiated in HiRadMat with different intensities, later imaged with a SEM microscope and tested for their mechanical properties. In addition, simulations have been carried out with the FLUKA particle physics Monte-Carlo code, in order to better understand the mechanisms and assess the energy deposition from protons at 440 GeV/c in those CNTF wires, depending mainly on their diameters and densities. This could lead to a good estimation of the CNTF temperature during irradiation. In this contribution, we first present the HiRadMat experimental setup and then we discuss the results of our FLUKA simulations.  
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slides icon Slides WE3C4 [4.793 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE3C4  
About • Received ※ 07 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 27 October 2022
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