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MOP33 |
Beam Current Measurements at the Nano-Ampere Level Using a Current Transformer |
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- M. Xiao
UMCG, Groningen, The Netherlands
- S. Brandenburg, M.J. Goethem
PARTREC, Groningen, The Netherlands
- T. Delaviere, L. Dupuy, F. Stulle
BERGOZ Instrumentation, Saint Genis Pouilly, France
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In conventional proton therapy (PT) typical beam currents are of the order of 1 nA. At these currents dose monitoring is reliably achieved with an ionization chamber. However, at the very high dose rates used in FLASH irradiations (employing beam currents >100 nA) ionization chambers will exhibit large intensity dependent recombination effects and cannot be used. A possible solution is a current transformer. Here we report on the performance of the LC-CWCT (Bergoz Instrumentation, France) which has been developed to push noise floor of such non-destructive current measurement systems into the nano-ampere range. We present first beam current measurements at the PARTREC cyclotron (Netherlands). Beam currents measured by the LC-CWCT and a Faraday Cup were shown to linearly correlate up to the maximum intensity of 400 nA used in the measurements. For pulsed beams, charge measured by the LC-CWCT linearly correlated with pulse length over the measurement range from 50 to 1000 µs. Measurement noise as low as 2.8 nA was achieved. The results confirm that the LC-CWCT has the potential to be applied in FLASH PT for accurate determination of beam current and macro pulse charge.
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DOI • |
reference for this paper
※ doi:10.18429/JACoW-IBIC2022-MOP33
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About • |
Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 14 September 2022 |
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