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TY - CONF AU - Kobayashi, T. AU - Akai, K. AU - Deguchi, H. AU - Ebihara, K. AU - Hayashi, K. AU - Iwaki, T. AU - Kabe, A. AU - Nakanishi, K. AU - Nishiwaki, M. AU - Odagiri, J.-I. AU - Ryoshi, M. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Status of LLRF Control System for SuperKEKB Commissioning 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 - Beam commissioning of the SuperKEKB will be started in JFY2015. A new LLRF control system, which is an FPGA-based digital RF feedback control system on the MicroTCA platform, has been developed for high current beam operation of the SuperKEKB. The mass production and installation of the new systems has been completed as scheduled. The new LLRF control systems are applied to nine RF stations (klystron driving units) among existing thirty stations. As a new function, klystron phase lock loop was digitally implemented within the cavity FB control loop in the FPGA, and in the high power test it worked successfully to compensate for the klystron phase change. Beam loading was also simulated in the high power test by using an ARES cavity simulator, and then good performance in the cavity-voltage feedback control and the cavity tuning control was demonstrated to compensate the large beam loading for the SuperKEKB parameters. Fabrication of another new LLRF control system for damping ring which is required for low-emittance positron injection is scheduled in JFY2015. PB - JACoW CP - Geneva, Switzerland SP - 924 EP - 926 KW - controls KW - cavity KW - LLRF KW - beam-loading KW - klystron DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-MOPHA056 UR - http://jacow.org/ipac2015/papers/mopha056.pdf ER -