Non-Destructive Beam Monitoring via Secondary Radiation Detection with Ce-Doped Silica Fibers
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Soggetti: | |
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| _version_ | 1866912978285101056 |
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| author | Gottstein, Alexander Casolaro, Pierluigi Dellepiane, Gaia Eggimann, Lars Kasanda, Eva Mateu, Isidre Usherovich, Samuel Scampoli, Paola Hoehr, Cornelia Braccini, Saverio |
| author_facet | Gottstein, Alexander Casolaro, Pierluigi Dellepiane, Gaia Eggimann, Lars Kasanda, Eva Mateu, Isidre Usherovich, Samuel Scampoli, Paola Hoehr, Cornelia Braccini, Saverio |
| contents | Non-destructive beam diagnostics are essential for low-energy medical cyclotrons, where even thin interceptive devices can severely degrade beam quality. We investigate an external fiber monitor (EFM) based on Ce-doped silica scintillating fibers that detects secondary radiation generated at existing beamline components of the 18 MeV Bern Medical Cyclotron beam transfer line (BTL). Three use cases were studied: (i) beam intensity monitoring around an electrically isolated, water-cooled beam dump; (ii) beam-loss monitoring around a 10 mm collimator under varying the beam focusing; and (iii) by steering a 6.5 mm $\times$ 6.5 mm beam spot on a beam dump. For case (i), the summed EFM signal exhibits a linear dependence on the current on target over nearly three orders of magnitude. In case (ii), a normalized EFM-based beam-loss proxy scales monotonically with an electrical loss proxy across several focusing settings. Furthermore, opposing-fiber signal ratios provide decoupled, monotonic sensitivity to horizontal and vertical beam displacements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_18293 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Non-Destructive Beam Monitoring via Secondary Radiation Detection with Ce-Doped Silica Fibers Gottstein, Alexander Casolaro, Pierluigi Dellepiane, Gaia Eggimann, Lars Kasanda, Eva Mateu, Isidre Usherovich, Samuel Scampoli, Paola Hoehr, Cornelia Braccini, Saverio Instrumentation and Detectors Accelerator Physics Non-destructive beam diagnostics are essential for low-energy medical cyclotrons, where even thin interceptive devices can severely degrade beam quality. We investigate an external fiber monitor (EFM) based on Ce-doped silica scintillating fibers that detects secondary radiation generated at existing beamline components of the 18 MeV Bern Medical Cyclotron beam transfer line (BTL). Three use cases were studied: (i) beam intensity monitoring around an electrically isolated, water-cooled beam dump; (ii) beam-loss monitoring around a 10 mm collimator under varying the beam focusing; and (iii) by steering a 6.5 mm $\times$ 6.5 mm beam spot on a beam dump. For case (i), the summed EFM signal exhibits a linear dependence on the current on target over nearly three orders of magnitude. In case (ii), a normalized EFM-based beam-loss proxy scales monotonically with an electrical loss proxy across several focusing settings. Furthermore, opposing-fiber signal ratios provide decoupled, monotonic sensitivity to horizontal and vertical beam displacements. |
| title | Non-Destructive Beam Monitoring via Secondary Radiation Detection with Ce-Doped Silica Fibers |
| topic | Instrumentation and Detectors Accelerator Physics |
| url | https://arxiv.org/abs/2601.18293 |