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TY - CONF AU - Nakanishi, Y. AU - Ichikawa, A. AU - Koseki, T. AU - Kuboki, H. AU - Minamino, A. AU - Nakamura, K.G. AU - Nakaya, T. AU - Toyama, T. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - The Development of 16-Electrode Monitor for Measurement of the Multipole-Moment J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - In the J-PARC main ring, the beam intensity is greatly increased to 750 kW or more in near future. Even the beam intensity become higher, the beam loss must be kept at the same level as present. Aiming to make the cause of beam loss clear, we have been developing the beam monitor to measure the beam size. The quadrupole moment is related to the beam size. In principle, monitors with more than four electrodes can measure the quadrupole moment. In addition, two monitors located at the places with different beta functions can measure the emittances and beam sizes, providing the horizontal and vertical beta functions. To obtain more precise quadrupole moment and higher multipoles, we are developing the multi-electrode monitor, tentatively, with 16 electrodes. As a reference of 16-electrode monitor, two 4-electrode BPMs are investigated to measure quadrupole moments. We will present the measurement result of 4-electrode monitors and the status of the development of the 32-electrode monitor. PB - JACoW CP - Geneva, Switzerland SP - 140 EP - 142 KW - quadrupole KW - injection KW - coupling KW - impedance KW - proton DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-MOPMB025 UR - http://jacow.org/ipac2016/papers/mopmb025.pdf ER -