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Beam Monitor Calibration for Radiobiological Experiments With Scanned High Energy Heavy Ion Beams at FAIR

Luoni, Francesca ; Weber, Uli ; Boscolo, Daria ; Durante, Marco ; Reidel, Claire-Anne ; Schuy, Christoph ; Zink, Klemens ; Horst, Felix (2024)
Beam Monitor Calibration for Radiobiological Experiments With Scanned High Energy Heavy Ion Beams at FAIR.
In: Frontiers in Physics, 2020, 8
doi: 10.26083/tuprints-00015961
Article, Secondary publication, Publisher's Version

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Type of entry: Secondary publication
Title: Beam Monitor Calibration for Radiobiological Experiments With Scanned High Energy Heavy Ion Beams at FAIR
Language: English
Date: 5 March 2024
Place of Publication: Darmstadt
Year of primary publication: 20 September 2020
Place of primary publication: Lausanne
Publisher: Frontiers Media S.A.
Journal or Publication Title: Frontiers in Physics
Volume of the journal: 8
Collation: 11 Seiten
DOI: 10.26083/tuprints-00015961
Corresponding Links:
Origin: Secondary publication DeepGreen

Precise and reliable monitoring of the particle rate is of great importance at accelerator facilities worldwide. In this article we describe the standard beam monitor calibration currently employed at the multi-purpose experimental sites Cave A and Cave M at GSI, where intense highly energetic ion beams are routinely used for a wide variety of experiments. An absolute dose-to-water measurement is performed with an air-filled ionization chamber and transferred into a calibration per primary particle. This is necessary for the raster scanning system used to enable the irradiation of extended fields, required for biophysical experiments in the research fields of particle therapy or space radiation protection. The main focus of this work is to understand through Monte Carlo simulations whether the currently used dosimetry procedure is valid for all the ion species and energies that are provided at GSI Cave A and Cave M by the SIS18 synchrotron and that will be provided by the SIS100 at FAIR. With this aim the detailed geometry of the PTW 30013 Farmer ionization chamber currently used at GSI was implemented in the transport code FLUKA and the beam quality correction factor kQ for different energies and ion species was calculated. Further details about the robustness of the calibration are investigated as well, e.g., appropriate irradiation depth of biological samples. Evidence is presented that for ions above 1 GeV/u the kQ factor decreases due to the density effect, which modifies the water-to-air stopping power ratio at relativistic energies. These findings are of particular importance for future biophysics experiments with ion beams from the SIS100 in the framework of the FAIR project. For energies in the regime of several GeV/u the constant kQ value as used in common practice should be replaced with the energy-dependent correction factor provided in this work.

Uncontrolled Keywords: heavy ion dosimetry, beam monitor calibration, raster scanning, beam quality correction factor, kQ, radiobiological irradiations, farmer ionization chamber
Identification Number: Artikel-ID: 568145
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-159613
Additional Information:

This article is part of the Research Topic: Applied Nuclear Physics at Accelerators

Classification DDC: 500 Science and mathematics > 530 Physics
600 Technology, medicine, applied sciences > 610 Medicine and health
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 05 Mar 2024 13:47
Last Modified: 05 Mar 2024 13:48
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/15961
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