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TY - CONF AU - Saha, P.K. AU - Harada, H. AU - Hayashi, N. AU - Miura, A. AU - Okabe, K. AU - Yoshimoto, M. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - Measurement of Each 324 MHz Micro Pulse Stripping Efficiency for H⁻ Laser Stripping Experiment in J-PARC RCS J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - In 3-GeV RCS of J-PARC, an experiment for H⁻ stripping to protons by using lasers is under preparation. The experiment requires measurements of all three charge fractions of each 324 MHz H-μpulse in the downstream of laser and H⁻ interaction point (IP). However, at the first stage, only a single H-μpulse is aimed to strip by using lasers. It is therefore very essential to establish a new measurement method for that purpose, which has not yet been studied anywhere in that direction. We consider measuring BPM (beam position monitor) pickup signal by using an oscilloscope of 4 GHz bandwidth and sampling rate no less than 1TS/s. To test the system, we have done some experimental studies, where beam halo scrapper (carbon foil), placed at the L-3BT (linac to 3-GeV beam transport) is used for H⁻ stripping. The unstripped H⁻ and the stripped protons separated by a bending magnet in the downstream of the scrapper are simultaneously measured by two BPMs in two beam lines. The H-μpulses were clearly measured with good resolution, where a ratio of the pulses without and with scrapper gives the stripping efficiency. A detail of the present study results are presented. PB - JACoW CP - Geneva, Switzerland SP - 233 EP - 236 KW - ion KW - laser KW - experiment KW - pick-up KW - proton DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-TUPCF12 UR - http://jacow.org/ibic2017/papers/tupcf12.pdf ER -