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TY - CONF AU - Hashimoto, Y. AU - Endo, M. AU - Hori, Y. AU - Murakami, M. AU - Murashima, K. AU - Muto, R. AU - Sakai, H. AU - Tachibana, M. AU - Tatami, A. AU - Tomizawa, M. AU - Toyama, T. AU - Uota, M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Beam Profile Monitor for Slow Extracted Beam Using Multi-Layered Graphene at J-PARC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Extracted-beam profiles in slow extraction at J-PARC has been measured by using secondary electrons emitted from a target array made by multi-layered graphen, in real time during spill time of around 2 seconds. The target array consists of 20 ribbons with width of 1 mm, pitch of 2 mm, and thickness of 1.1 micron. Secondary-electron current at each channel is measured by a current amplifier having sensitivity more than 1 pA. These configuration produces useful information for beam dynamics in slow extraction. We have set this monitor at the entrance of a septum magnet, then we can also measure the last few-turns beam with the extracted beam simultaneously. We will discuss about features of this instrument and recent beam study with 51 kW extracted-beams. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2532 EP - 2535 KW - target KW - electron KW - extraction KW - proton KW - real-time DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW030 UR - http://jacow.org/ipac2019/papers/wepgw030.pdf ER -