Author: Yu, T.-C.
Paper Title Page
WEPO036 Design of a Cryogenic Regulation Valve Box for SRF Operation at TPS 2475
 
  • M.H. Chang, L.-H. Chang, L.J. Chen, F.-T. Chung, F. Z. Hsiao, M.-C. Lin, Y.-H. Lin, C.H. Lo, H.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh, T.-C. Yu
    NSRRC, Hsinchu, Taiwan
  • L.L. Han, M.H. Tsai
    NTUT, Hsinchu, Taiwan, Taiwan
  
  A 3-GeV light source named Tai­wan Pho­ton Source (TPS) at Na­tion­al Syn­chrotron Ra­di­a­tion Re­search Cen­ter (NSRRC) is under con­struc­tion, and is sched­uled for com­mis­sion­ing in 2013/2014. An SRF mod­ule of KEKB type has been se­lect­ed for the TPS as the ac­cel­er­at­ing cav­i­ty of its stor­age ring. The SRF valve boxes, as part of the cryo­genic trans­fer sys­tem, sta­bi­lize the cryo­genic op­er­a­tional con­di­tions re­quired for var­i­ous needs of SRF op­er­a­tion. The SRF op­er­a­tion re­quires a large dy­nam­ic vari­a­tion in the cryo­genic load­ing that chal­lenges ap­pro­pri­ate siz­ing of the cryo­genic reg­u­la­tion valves to min­i­mize the pres­sure drop and con­cur­rent­ly to main­tain a fine reg­u­la­tion of pres­sure. Here, we re­port our de­sign con­sid­er­a­tions for an SRF valve box with em­pha­sis on high­ly sta­bi­liz­ing the he­li­um pres­sure for SRF op­er­a­tion with a du­al-re­turn valve scheme. The es­ti­mat­ed fluc­tu­a­tions of pres­sure due to fi­nite ac­cu­ra­cy of the valve open­ing de­crease to a tenth of what is ob­tained from the con­ven­tion­al sin­gle re­turn-valve scheme.