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TY - CONF AU - Mitsuda, C. AU - Harada, K. AU - Higashi, N. AU - Honda, T. AU - Kobayashi, Y. AU - Miyauchi, H. AU - Nagahashi, S. AU - Nakamura, N. AU - Nogami, T. AU - Obina, T. AU - Tadano, M. AU - Takai, R. AU - Takaki, H. AU - Tanimoto, Y. AU - Uchiyama, T. AU - Ueda, A. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Injection Section Upgrading with the Septum-Magnet Replacement in KEK-PF Ring J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - In 2015, the water leakage happened at the cooling pipe of the in-vacuum septum magnet installed into the injection point. Because the maintenance of the leakage needed the total replacement of the magnet, the water circulation was stopped permanently, and accordingly, the light absorber was installed upstream in the storage ring to prevent the synchrotron light of the bending magnet from coming to the septum wall. This treatment temporally worked well, but the beam injection efficiency was decreased to about 30% due to the physical aperture narrowed by the absorber. With the desired replacement of septum magnet to maintainable out-vacuum type, the injection section upgrading was simultaneously planned to recover and improve the injection efficiency. In this upgrade, the injection beam is closed to the stored beam more than before by adapting the thinner septum structure as a way to improve the injection efficiency. And some new ideas are introduced in the part of monitor and beam duct, for example, realtime beam monitor, thinner Inconel duct. The detailed design of the upgraded injection section and technical points will be reviewed in this conference. PB - JACoW Publishing CP - Geneva, Switzerland SP - 342 EP - 345 KW - injection KW - septum KW - vacuum KW - storage-ring KW - operation DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-MOPAB091 UR - https://jacow.org/ipac2021/papers/mopab091.pdf ER -