ArticleJournal of applied clinical medical physics2026
Evaluation of a Faraday cup-style detector as a beam diagnostic system for ultra-high dose rate (FLASH) electron beams.
Article in Journal of applied clinical medical physics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- Evaluation of a Faraday cup-style detector as a beam diagnostic system for ultra-high dose rate (FLASH) electron beams.Journal of applied clinical medical physics · 2026Article
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Authors and funding
6 authors.
Funding
Abstract
backgroundBeam diagnostic systems are essential for the development and quality assurance of ultra-high dose rate (UHDR) radiation sources to enable reliable delivery of FLASH radiotherapy (RT). Critically, suitable beam diagnostic systems for electron FLASH sources are lacking. PURPOSE: In this study, we evaluated a Faraday cup-style beam collector (BC), the BC-145-Al, on an UHDR electron linac for FLASH-RT applications.
methodsThe BC performance was benchmarked against a reference alternating-current current transformer (ACCT) across a wide range of beam currents and pulse structures to test the BC's charge linearity and signal resolution capabilities. Two termination impedances were tested: 200 kΩ and 13 Ω.
resultsThe highly time-resolved signal of the BC was charge-proportional when terminated at 200 kΩ and current-proportional when terminated at 13 Ω, agreeing well with the time-resolved ACCT signal. The cumulative signals from the BC and ACCT showed excellent agreement, maintaining linearity with a deviation of less than ± 0.5% over 50 consecutive pulses (4-µs pulse width, 120-Hz pulse repetition frequency [PRF]). The BC/ACCT signal ratio remained stable within ± 0.5% as the PRF increased from 5 to 120 Hz at constant pulse width. Pulse width measurements from both detectors were also consistent within ± 0.5% across all nominal pulse width values (0.5-4 µs). When the charge per pulse was modulated by either increasing the pulse width or decreasing the source-to-surface distance (from 32.3 to 19.3 cm), the BC signal remained approximately linear with respect to the ACCT signal; however, the BC/ACCT ratio deviated by up to ± 6% across this range.
conclusionsThe BC produced highly time-resolved absolute charge measurements of a pulsed UHDR electron beam across a large range of beam parameters. These results support its potential as a beam diagnostic system for both preclinical studies and clinical applications of electron FLASH radiotherapy.
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