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Park, I.S.

Paper Title Page
WEPEC045 Taper Shape Effects on the HOM Damping of the PLS-II SRF Cavities 2989
 
  • S. An, Y.D. Joo, H.-S. Kang, C.D. Park, I.S. Park, Y.U. Sohn
    PAL, Pohang, Kyungbuk
  
 

In the PLS-II stor­age ring, the avail­able length of a long straight sec­tion for RF sys­tem is 6.28 m, which is from quadrupole mag­net to quadrupole mag­net beam-pipe valves with an el­lip­ti­cal trans­verse cross sec­tion. In this room, two beam-pipe tran­si­tions from el­lip­ti­cal to cir­cle cross sec­tion, two com­mer­cial cry­omod­ules with a cir­cle trans­verse cross sec­tion, three bel­lows for ad­just­ing cry­omod­ule length and four vac­u­um valves could need to be in­stalled. Two com­mer­cial cry­omod­ules are too long to be in­stalled into this sec­tion. In order to in­stall two cry­omod­ules into this sec­tion, we need to mod­i­fy the ta­pers for re­duc­ing the total length of these parts. In this paper, the HOM damp­ing ef­fects for dif­fer­ent taper shapes has been stud­ied. The beam loss fac­tor in­flu­ence and broad-band impedance change due to taper shape changes have been es­ti­mat­ed.

  
WEPEC046 Design of Superconducting RF System for PLS-II Upgrade 2992
 
  • Y.U. Sohn, S. An, M.-H. Chun, Y.D. Joo, H.-S. Kang, H.-G. Kim, K.R. Kim, C.D. Park, H.J. Park, I.S. Park, I.H. Yu
    PAL, Pohang, Kyungbuk
  
 

The RF sys­tem for PLS-II up­grade, of which beam cur­rent and emit­tance are 400 mA and 5.6 nmrad at 3 GeV, be­comes much more im­por­tant com­pared to PLS. To re­duce the HOM in­ten­si­ty in RF cav­i­ties for sta­ble beam, a su­per­con­duct­ing RF cav­i­ty is se­lect­ed for the PLS-II. The RF sys­tem has to com­pen­sate beam loss power of 663 kW from 24 bend­ing mag­nets, 20 in­ser­tion de­vices and other loss­es by RF HOM and broad­band loss­es along vac­u­um cham­bers. For suf­fi­cient en­er­gy ac­cep­tance and life­time the de­sign RF volt­age is 4.5 MV. Three 500 MHz su­per­con­duct­ing cav­i­ties will be op­er­at­ed from Oc­to­ber 2012, fol­low­ing suc­cess­ful com­mis­sion­ing with PLS NC cav­i­ties from July 2011. For the 3 SRF cry­omod­ules, a 700 W class He cryo­genic sys­tem will be pre­pared in 2011. The de­sign of PLS-II SRF sys­tem in­clud­ing cryo­genic sys­tem will be re­port­ed in the paper.