Author: Chun, M.-H.
Paper Title Page
MOPEA048 Operation Status of RF System for the PLS-II Storage Ring 187
 
  • M.-H. Chun, J.Y. Huang, Y.D. Joo, H.-G. Kim, S.H. Nam, C.D. Park, H.J. Park, I.S. Park, Y.U. Sohn, I.H. Yu
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Funding: Supported by the Korea Ministry of Science and Technology
The RF sys­tem of the Po­hang Light Source-II (PLS-II) stor­age ring is op­er­at­ing at the 3.0GeV/200mA with two su­per­con­duct­ing RF (SRF) cav­i­ties. Each RF sta­tion is com­posed with a 300kW kly­stron with power sup­ply unit, trans­mis­sion com­po­nents, a dig­i­tal LLRF and a SRF cav­ity. And a cryo­genic sys­tem of 700W ca­pac­i­ties is sup­plied the LHe and LN2 to three cry­omod­ules of SRF cav­i­ties. The sec­ond SRF cav­ity is in­stalled dur­ing at the be­gin­ning in 2013 and the third one will be in­stalled dur­ing sum­mer shut­down in 2014 for sta­ble 400mA op­er­a­tion with all 20 in­ser­tion de­vices. Also the third high power RF sta­tion with a 300kW kly­stron, power sup­ply unit and WR1800 wave­guide com­po­nents will be pre­pared in 2013. The third LLRF sys­tem is al­ready in­stalled, but im­proved sta­bil­i­ties of am­pli­tude, phase and tuner con­trol. This paper de­scribes the pre­sent op­er­a­tion sta­tus and im­prove plan of the RF sys­tem for the PLS-II stor­age ring. 		 
 
WEPWO041 Beam Commissioning Superconducting RF Cavities for PLS-II Upgrade 2390
 
  • Y.U. Sohn, M.-H. Chun, J.Y. Huang, Y.D. Joo, S.H. Nam, C.D. Park, H.J. Park, I.S. Park, I.H. Yu
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Two su­per­con­duct­ing RF cav­i­ties were com­mis­sioned with elec­tron beam at PLS-II, which is up­graded ma­chine from PLS with 3 GeV, 20 in­ser­tion de­vices, and now on user ser­vice. These srf cav­i­ties have been pre­pared dur­ing last 3 years. Each cav­ity was tested with higher than 2 MV rf volt­age and 125 kW stand­ing wave power at CW mode after in­stal­la­tion at stor­age ring. PLS-II is on user op­er­a­tion with 200 mA beam cur­rent now, and on the way of beam cur­rent im­prove­ment upto 400mA, by syn­chro­tron con­di­tion­ing for beam cham­ber and in-vac­uum udu­la­tors. Upto 200 mA beam cur­rent no beam in­sta­bil­ity from the higher order modes is ob­served. With top-up mode op­er­a­tion, the er­rors of am­pli­tude of rf field and phase are recorded as 0.3% and 0.3 de­gree peak to peak, re­spec­tively dur­ing one day. Suc­cess­ful PLS-II up­grade with hard­ware and its de­signed per­for­mance will be de­clared at the end of 1st half user run in 2013.