Author: Michizono, S.
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MOPCTH010 Design Work of the ERL-FEL as the High Intense EUV Light Source 4
 
  • N. Nakamura, S. Chen, T. Furuya, K. Haga, I. Hanyu, K. Harada, T. Honda, Y. Honda, E. Kako, Y. Kamiya, R. Kato, H. Kawata, Y. Kobayashi, T. Konomi, T. Kubo, S. Michizono, T. Miyajima, H. Nakai, T. Obina, K. Oide, H. Sakai, S. Sakanaka, M. Shimada, K. Tsuchiya, K. Umemori, M. Yamamoto
    KEK, Ibaraki, Japan
  • R. Hajima, N. Nishimori
    JAEA, Ibaraki-ken, Japan
  
  En­ergy re­cov­ery linac(ERL)-based free elec­tron lasers(FELs) are promis­ing can­di­dates for high-power EUV sources. They can re­cover most ac­cel­er­a­tion en­ergy from the elec­tron beams and greatly re­duce the dumped beam power and ac­ti­va­tion com­pared with those based on or­di­nary lin­ear ac­cel­er­a­tors. We have in­ves­ti­gated a fea­si­ble de­sign of a 10-kW class ERL-FEL op­er­ated at 13.5 nm for EUV lith­o­g­ra­phy ap­pli­ca­tions. In this talk, we will pre­sent the de­sign work of the ERL-FEL as the high-power EUV source.  
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WEIBLH2054 Operational Experience of CW SRF Injector and Main Linac Cryomodules at the Compact ERL 63
 
  • H. Sakai, K. Enami, T. Furuya, E. Kako, Y. Kondo, S. Michizono, T. Miura, F. Qiu, M. Sato, K. Shinoe, T. Shishido, K. Umemori, K. Watanabe, Y. Yamamoto
    KEK, Ibaraki, Japan
  • E. Cenni
    Sokendai, Ibaraki, Japan
  • M. Sawamura
    JAEA, Ibaraki-ken, Japan
  
  We de­vel­oped ERL in­jec­tor cry­omod­ule and main linac for Com­pact ERL (cERL) pro­ject. The in­jec­tor cry­omod­ule in­cludes three 2-cell L-band su­per­con­duct­ing cav­i­ties. The main linac cry­omod­ule in­cludes two 9-cell L-band su­per­con­duct­ing cav­i­ties. After con­struc­tion of cERL in­jec­tor and re­cir­cu­la­ton loop, beam op­er­a­tion was started with 20 MeV beam and after pre­cise beam tun­ing, en­ergy re­cov­ery op­er­a­tion was achieved with more than 80uA. In­jec­tor and main linac cav­ity were sta­ble for ERL beam op­er­a­tion with Dig­i­tal LLRF sys­tem. Field emis­sion is the se­vere prob­lem for main linac and heat­ing of HOM cou­pler is the prob­lem for in­jec­tor. We mainly de­scribe the cav­ity per­for­mances of two cERL cry­omod­ules dur­ing long-term beam op­er­a­tion.  
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WEIDLH2066 Performance of the Digital LLRF Systems at KEK cERL 84
 
  • F. Qiu, D.A. Arakawa, Y. Honda, H. Katagiri, T. Matsumoto, S. Michizono, T. Miura, T. Obina, H. Sakai
    KEK, Ibaraki, Japan
  • S.B. Wibowo
    Sokendai, Ibaraki, Japan
  
  A com­pact en­ergy re­cov­ery linac (cERL), which is a test ma­chine for the next gen­er­a­tion syn­chro­tron light source 3-GeV ERL, was con­structed at KEK. In the cERL, a nor­mal con­duct­ing (NC) buncher cav­ity and three su­per­con­duct­ing (SC) two-cell cav­i­ties were in­stalled for the in­jec­tor, and two nine-cell SC cav­i­ties were in­stalled for the main linac (ML). The ra­dio-fre­quency (RF) fluc­tu­a­tions for each cav­ity are re­quired to be main­tained at less than 0.1% rms in am­pli­tude and 0.1° in phase. These re­quire­ments are ful­filled by ap­ply­ing dig­i­tal low-level ra­dio-fre­quency (LLRF) sys­tems. Dur­ing the beam-com­mis­sion­ing, the LLRF sys­tems were eval­u­ated and val­i­dated. A mea­sured beam mo­men­tum jit­ter of 0.006% shows that the tar­get of the LLRF sys­tems is achieved. To fur­ther im­prove the sys­tem per­for­mance, an adap­tive feed­for­ward (FF) con­trol-based ap­proach was pro­posed and demon­strated in the beam-com­mis­sion­ing. The cur­rent sta­tus of LLRF sys­tem and the adap­tive FF ap­proach for LLRF con­trol in the cERL are pre­sented in this paper.  
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