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@inproceedings{xiao:ibic2022-mop33, author = {M. Xiao and S. Brandenburg and T. Delaviere and L. Dupuy and M.J. Goethem and F. Stulle}, title = {{Beam Current Measurements at the Nano-Ampere Level Using a Current Transformer}}, & booktitle = {Proc. IBIC'22}, booktitle = {Proc. 11th Int. Beam Instrum. Conf. (IBIC'22)}, pages = {121--124}, eid = {MOP33}, language = {english}, keywords = {experiment, proton, electron, electronics, controls}, venue = {Kraków, Poland}, series = {International Beam Instrumentation Conference}, number = {11}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {12}, year = {2022}, issn = {2673-5350}, isbn = {978-3-95450-241-7}, doi = {10.18429/JACoW-IBIC2022-MOP33}, url = {https://jacow.org/ibic2022/papers/mop33.pdf}, abstract = {{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.}}, }