• I.C. Sheng, J.-R. Chen, Y.T. Cheng, G.-Y. Hsiung, C.K. Kuan, C.Y. Yang
  NSRRC, Hsinchu

The Tai­wan Pho­ton Source (TPS) is a third gen­er­a­tion syn­chrotron ac­cel­er­a­tor which the de­signed en­er­gy will be 3 GeV where­as the cur­rent is 500mA. The role of crotch ab­sorber is de­signed to pro­tect down­stream UHV vac­u­um cham­ber. It is is the only mask com­po­nent to ab­sorb large amount of syn­chrotron ra­di­a­tion (bend­ing mag­net) in the stor­age ring. Crotch ab­sorber is in­stalled from trans­verse di­rec­tion of the bend­ing cham­ber to in­ter­cept the power. Two bent OFHC cop­per tubes are vac­u­um brazed on the cop­per mask. A 30 de­gree groove is ma­chined to face bend­ing mag­net fan. The rea­son is not only to dis­si­pate the heat but also to limit back scat­ter­ing to the rest of cham­bers. Top and bot­tom of the ab­sorber are bolt­ed with beryl­li­um cop­per springs; they will pro­vide extra sup­port for the ab­sorber after it is in­stalled in the Alu­minum cham­ber. Three ther­mo­cou­ples will be em­bed­ded in­side of the mask to mon­i­tor the tem­per­a­ture gra­di­ent. Final pro­to­type of the crotch ab­sorber with ther­mal anal­y­sis, de­sign and ma­chined parts are also pre­sent­ed in this paper.

• C.Y. Yang, J.-R. Chen, G.-Y. Hsiung, Z.-D. Tsai
  NSRRC, Hsinchu

Alu­minum alloy was cho­sen for vac­u­um cham­ber ma­te­ri­als and oil-free man­u­fac­tur­ing, ozone water clean­ing pro­cess­es were used to ob­tain ul­tra­high vac­u­um in TPS vac­u­um sys­tem. The stor­age ring vac­u­um sys­tem is di­vid­ed into 24 unit cells and there are 6 ion­ized gauges, 8 ion pumps and 6 gate valves in one cell. An in­ter­lock sys­tem is de­signed to mon­i­tor and con­trol the vac­u­um de­vices to keep ul­tra­high vac­u­um. Be­cause the vac­u­um cham­ber is ex­posed to the high power syn­chrotron ra­di­a­tion di­rect­ly, cool­ing water and tem­per­a­ture sta­tus­es on the vac­u­um cham­ber are also mon­i­tored. The hard­ware, soft­ware and their as­so­ci­at­ed in­ter­lock logic will be de­scribed.