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TY - CONF AU - Nakamura, K.G. AU - Chin, Y.H. AU - Koseki, T. AU - Obina, T. AU - Okada, M. AU - Shobuda, Y. AU - Tobiyama, M. AU - Toyama, T. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Development of Wideband BPM for Precise Measurement of Internal Bunch Motion J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - To suppress intra-bunch oscillations and to reduce particle losses, the intra-bunch feedback (IBFB) system has been developed in 2014 for the J-PARC Main Ring (MR). A new BPM was also installed to the MR for the IBFB system. This BPM has a sufficient frequency response and position sensitivity(up to 1.5GHz within 15% fluctuation ). However, a better performance may be needed in future for more precise analysis of internal motions (e.g. due to an electron cloud). We report the development of the BPM and precise measurement results of the BPM characteristics. We also report simulation studies of the digital equalizer which helps to reconstructs the beam shape from beam signals. PB - JACoW CP - Geneva, Switzerland SP - 937 EP - 939 KW - impedance KW - coupling KW - feedback KW - synchrotron KW - network DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-MOPTY001 UR - http://jacow.org/ipac2015/papers/mopty001.pdf ER -