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TY - CONF AU - Huang, W.L. AU - Huang, M.Y. AU - Li, F. AU - Liu, M.Y. AU - Qiu, R.Y. AU - Wang, A.X. AU - Xu, T.G. ED - Schaa, Volker RW ED - Jansson, Andreas ED - Shea, Thomas ED - Olander, Johan TI - A Dual Functional Current Monitor for Stripping Efficiency Measurement in CSNS J2 - Proc. of IBIC2019, Malmö, Sweden, 08-12 September 2019 CY - Malmö, Sweden T2 - International Beam Instrumentation Conferenc T3 - 8 LA - english AB - China Spallation Neutron Source (CSNS), the biggest platform for neutron scattering research in China, has been finished construction and already in user operation stage by the end of 2017. During the multi-turn charge-exchange injection, H⁻ stripping by a carbon primary stripper foil (100 ¿g/cm²) and a secondary stripper foil (200 ¿g/cm²) is adopted for this high intensity proton synchrotron. In order to evaluate the stripping efficiency and the foil aging, a dual-function low noise current transformer and corresponding electronics are designed to measure the ultra-low intensity of H⁻ and H⁰, which are not stripped completely by the 1st foil but totally stripped charge changing to H⁺ and delivered to the IN-DUMP. The self-designed CT sensors made of domestic nanocrystalline toroids, the noise analysis and elimination, measurement results and further improvement proposals are presented in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 96 EP - 99 KW - electronics KW - electron KW - injection KW - proton KW - shielding DA - 2019/11 PY - 2019 SN - 2673-5350 SN - 978-3-95450-204-2 DO - doi:10.18429/JACoW-IBIC2019-MOPP011 UR - http://jacow.org/ibic2019/papers/mopp011.pdf ER -