• J.-I. Odagiri, K. Akai, K. Furukawa, S. Michizono, T. Miura, T.T. Nakamura
  KEK, Ibaraki
• H. Deguchi, K. Hayashi, J. Mizuno, M. Ryoshi
  Mitsubishi Electric TOKKI Systems, Amagasaki, Hyogo

Gaz­ing at Su­perKEKB pro­ject, a new con­trol sub­sys­tem was de­signed and im­ple­ment­ed to up­grade the low level RF sys­tem of the KEKB ac­cel­er­a­tor based on Ex­per­i­men­tal and In­dus­tri­al Con­trol Sys­tem (EPICS). The new con­trol sub­sys­tem com­pris­es a uTCA, a PLC, and an in­dus­tri­al PC. Each card plugged in the uTCA chas­sis and the PLC func­tion as an em­bed­ded Input / Out­put Con­troller (IOC) by run­ning the EPICS core pro­gram on the Linux op­er­at­ing sys­tem. The in­dus­tri­al PC runs Ex­ten­si­ble Dis­play Manger on Linux to serve as an Op­er­a­tor In­ter­face (OPI). This paper de­scribes the de­tails of the de­sign and the im­ple­men­ta­tion of the fully em­bed­ded EPICS-based low level RF con­trol sub­sys­tem for Su­perKEKB.

• M. Adachi, K. Hayashi, M. Katoh, S.I. Kimura, J. Yamazaki, H. Zen
  UVSOR, Okazaki
• M. Hosaka, Y. Taira, Y. Takashima, N. Yamamoto
  Nagoya University, Nagoya
• T. Takahashi
  KURRI, Osaka
• T. Tanikawa
  Sokendai - Okazaki, Okazaki, Aichi

UVSOR, a 750 MeV syn­chrotron light source of 53m cir­cum­fer­ence had been op­er­at­ed for more than 20 years. After a major up­grade in 2003, this ma­chine was re­named to UVSOR-II. The ring is now rou­tine­ly op­er­at­ed with low emit­tance of 27 nm-rad and with four un­du­la­tors. By uti­liz­ing a part of the ex­ist­ing FEL sys­tem and an ul­tra-short laser sys­tem, co­her­ent syn­chrotron ra­di­a­tion in THz range and co­her­ent har­mon­ic gen­er­a­tion in VUV range have been ex­ten­sive­ly stud­ied under in­ter­na­tion­al col­lab­o­ra­tions. Based on re­sults ob­tained from pre­vi­ous co­her­ent light source de­vel­op­ments, a new five-year re­search pro­gram on the co­her­ent light source de­vel­op­ments has been start­ed from FY2008, which in­cludes cre­ation of a new 4-m long straight sec­tion by mov­ing the in­jec­tion point, up­grades of the un­du­la­tor and the laser sys­tem and con­struc­tion of ded­i­cat­ed beam-lines for these co­her­ent light sources. Pre­sent sta­tus and up­grade plan on these co­her­ent light sources at UVSOR-II will be pre­sent­ed at the con­fer­ence.

• H. Zen, K. Hayashi, J. Yamazaki
  UVSOR, Okazaki
• M. Adachi, M. Katoh, T. Tanikawa, H. Zen
  Sokendai - Okazaki, Okazaki, Aichi
• M. Hosaka, Y. Taira, N. Yamamoto
  Nagoya University, Nagoya

UVSOR-II is a low emit­tance, 750 MeV syn­chrotron light source. Low emit­tance and low en­er­gy syn­chrotron light sources nat­u­ral­ly suf­fered from short elec­tron life­time due to Tou­schek ef­fect. Top-up op­er­a­tion is a so­lu­tion for over­com­ing the ef­fect. In the UVSOR-II, tri­als of mul­ti-bunch top-up op­er­a­tion at the full en­er­gy were start­ed from 2008. In the tri­als, we have suc­ceed­ed in keep­ing the stored beam cur­rent around 300 mA for 12 hours. From this fis­cal year, sin­gle bunch in­jec­tion was start­ed for sin­gle bunch user op­er­a­tions and for ex­per­i­ments on ad­vanced light source de­vel­op­ment such as Free Elec­tron Laser (FEL), Co­her­ent Syn­chrotron Ra­di­a­tion (CSR), Co­her­ent Har­mon­ic Gen­er­a­tion (CHG), which re­quire sin­gle bunch or 2-bunch fill­ing op­er­a­tion. We have al­ready per­formed sin­gle bunch top-up op­er­a­tion in user time with the stored beam cur­rent of 50 mA. And FEL las­ing with top-up op­er­a­tion was also achieved at the laser wave­length of 215 nm with the stored beam cur­rent of 130 mA / 2-bunch. In the FEL las­ing ex­per­i­ment, we suc­ceed­ed in keep­ing the av­er­age power of FEL around 130 mW for three hours.