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TY - CONF AU - Otani, M. AU - Futatsukawa, K. AU - Hirano, K. AU - Liu, Y. AU - Maruta, T. AU - Miura, A. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Longitudinal Bunch Size Measurements with an RF Deflector at J-PARC LINAC J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - Measurement of the longitudinal bunch size is important for the stable beam operation. Especially in a medium energy beam transport (MEBT) located after a radio-frequency quadrupole in J-PARC, it is necessary to measure the bunch size with minimum set of equipment to avoid subsequent emittance growth due to space charge. We had proposed a longitudinal size measurement with an rf deflector normally used for deflecting theμbunch; phase spread is migrated to spatial one if the reference particle arrives at the deflector when the voltage is rising in time and is zero. Then a buncher cavity located upstream of the deflector is utilized to scan the phase spread to measure the longitudinal beam parameters. In this poster, recent measurement results are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 974 EP - 976 KW - simulation KW - radio-frequency KW - linac KW - rfq KW - DTL DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-TUPAK008 UR - http://jacow.org/ipac2018/papers/tupak008.pdf ER -