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TY - CONF AU - Tomizawa, M. AU - Arakaki, Y. AU - Fujii, Y. AU - Fukao, Y. AU - Hashimoto, Y. AU - Igarashi, Y. AU - Kimura, T. AU - Mihara, S. AU - Moritsu, M. AU - Murasugi, S. AU - Muto, R. AU - Nishiguchi, H. AU - Okamura, K. AU - Shirakabe, Y. AU - Tamura, F. AU - Ueno, K. AU - Yanaoka, E. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - 8 Gev Slow Extraction Beam Test for Muon to Electron Conversion Search Experiment 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 - A muon to electron conversion search experiment (COMET) planned at J-PARC needs 8 GeV bunched proton beams with a continuous 1 MHz pulse structure. In this experiment, an intensity ratio of the residual to the main pulsed beam, which is expressed as extinction, should be less than the level of 10⁻¹⁰. In RUN78 (Jan. to Feb., 2018), we have succeeded in slow extraction of 8 GeV protons with 7.3×1012 ppp, satisfies the COMET phase-I requirement, and the extinction derived from a timing measurement of secondary particles from the target shows a promising result. A mechanism to explain the measured extinction will be also described in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2322 EP - 2325 KW - kicker KW - extraction KW - timing KW - injection KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPMP010 UR - http://jacow.org/ipac2019/papers/wepmp010.pdf ER -