• T.-C. Yu, L.-H. Chang, M.-C. Lin, Ch. Wang, M.-S. Yeh
  NSRRC, Hsinchu

The RF power source using sol­id-state am­pli­fi­er for ac­cel­er­a­tor ap­pli­ca­tion has be­come pop­u­lar in re­cent years. The am­pli­fiers array using power di­vider and power com­bin­er could ob­tain equiv­a­lent power level as those using klystron or IOT. Such sol­id-state RF power source also has the ad­van­tage of easy main­te­nance, low cost, low DC power volt­age and high flex­i­bil­i­ty. The de­vel­op­ment of sol­id-state power am­pli­fi­er mod­ule at 499.65 MHz using the lat­est RF power chip has been built to have the power level of 900 Watts with above 60% ef­fi­cien­cy of sin­gle power mod­ule. The more power that one mod­ule can pro­vide, the less num­ber of mod­ules would be re­quired under the same total out­put power of am­pli­fiers array. Thus, the con­struc­tion of a trans­mit­ter by sol­id-state tech­nique for RF sys­tem would be less com­plex for easy main­te­nance.

• M.-C. Lin, L.-H. Chang, M.H. Chang, L.J. Chen, W.-S. Chiou, F.-T. Chung, F. Z. Hsiao, Y.-H. Lin, C.H. Lo, H.H. Tsai, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh, T.-C. Yu
  NSRRC, Hsinchu
• M. Di Palma, S. Lange, H. Lehmann, K. Schippl
  NEXANS Deutschland Industries AG & Co. KG, Moenchengladbach

The Na­tion­al Syn­chrotron Ra­di­a­tion Re­search Cen­ter is con­struct­ing the Tai­wan Pho­ton Source (TPS), a 3-GeV syn­chro­ton fa­cil­i­ty. The su­per­con­duct­ing radio fre­quen­cy (SRF) cav­i­ty mod­ules are se­lect­ed as the ac­cel­er­at­ing cav­i­ties in the elec­tron stor­age ring. A test area for the SRF mod­ules is es­tab­lished in the RF lab­o­ra­to­ry, which in­cludes cryo­genic en­vi­ron­ment, RF trans­mit­ter, low level RF con­trol sys­tem, and ra­di­a­tion shield­ed space. The liq­uid he­li­um is trans­ferred from the cryo­genic plant in the ex­per­i­men­tal area of the Tai­wan Light Source (TLS), which is not only far from the RF lab­o­ra­to­ry but also char­ac­ter­ized by a com­pli­cat­ed route of 205 me­ters. The main con­cerns on the cryo­genic trans­fer are the in­stal­la­tion dif­fi­cul­ty, heat loss, two-phase flow, and pres­sure loss. In­stead of a mul­ti-chan­nel trans­fer line, which would re­quest a long in­stal­la­tion pe­ri­od on ra­di­a­tion-re­strict area, flex­i­ble cryo­genic trans­fer lines from Nex­ans were cho­sen. The in­stal­la­tion pe­ri­od was dra­mat­i­cal­ly re­duced to one week. With a test Dewar in the RF lab and valve boxes on both ends of the trans­fer lines, a long dis­tance cryo­genic trans­fer sys­tem was com­plet­ed and proved to work func­tion­al.