Author: Hsu, S-N.
Paper Title Page
THPFI071 Baking Tests and Results of A1050 Diamond Edge Gasket 3463
 
  • Y.T. Huang, C.-C. Chang, J.-R. Chen, G.-Y. Hsiung, S-N. Hsu, H.P. Hsueh
    NSRRC, Hsinchu, Taiwan
  • J.-R. Chen
    National Tsing Hua University, Hsinchu, Taiwan
  
  A1050 is a com­mon and soft ma­te­r­ial, widely used in every­day life. It is machin­able and cheap, which makes it a can­di­date for a gas­ket ma­te­r­ial. In the case of seal­ing be­tween dis­parate ma­te­ri­als, treat­ing the ther­mal ex­pan­sion when the gas­ket suf­fers from bak­ing is dif­fi­cult. The clear­ance and the ec­cen­tric­ity be­tween the gas­ket and the flange are also im­por­tant; most leaks occur about 80 ~ 110 oC. The ex­per­i­men­tal ap­pa­ra­tus com­prised a vac­uum cham­ber with six di­a­mond-edge gas­kets as­sem­bled, a turbo-mol­e­c­u­lar pump and an ex­trac­tor gauge. The pre-bak­ing torque for this gas­ket is 70 – 80 kg cm; the rates of both heat­ing and cool­ing are less than 40 oC per hour. The gas­kets are baked re­peat­edly under the same con­di­tions ex­clud­ing the tar­get tem­per­a­ture set for bak­ing. A1050 di­a­mond gas­kets work well after bak­ing at 120 ~ 140 oC; at tem­per­a­ture 170 ~ 180 oC, leaks some­times ap­pear on cool­ing. This paper pre­sents the bak­ing re­sults of A1050 di­a­mond-edge gas­ket and ex­plains the cause of leak­ing after bak­ing above 150 oC.  
 
THPFI075 Baking Test for an In-vacuum Undulator 3469
 
  • L.H. Wu, C.K. Chan, J.-R. Chen, G.-Y. Hsiung, S-N. Hsu, H.P. Hsueh, J.C. Huang, C.K. Yang
    NSRRC, Hsinchu, Taiwan
  • J.-R. Chen
    National Tsing Hua University, Hsinchu, Taiwan
  
  For Tai­wan Pho­ton Source in NSRRC, the in-vac­uum un­du­la­tor (IU22) will be set in the straight sec­tion. The bak­ing test took place in the NSRRC. The heat­ing wires were welded on the out­side wall of stain­less cham­ber. The tape heaters were used for the sites with­out the heat­ing wires. After ac­cep­ta­tion test, we as­sem­ble the resid­ual gas analy­sis (RGA) and ex­trac­tor gauge in the IU22. The pump­ing down curve and RGA spec­trum were recorded and in­ves­ti­gated. It was found the slope of the pump­ing curve near 1 h is -0.99. When the tem­per­a­ture grad­u­ally in­creases to about 185 oC, the vac­uum pres­sure ar­rives to about 8.7x10-5 Torr. The most gas source is from water be­fore bak­ing process. After bak­ing test, the major resid­ual gas in­cludes H2, CH4, H2O, CO, and CO2. We an­a­lyze the RGA spec­trum dur­ing the bak­ing process and dis­cuss in the paper.  
 
THPFI077 Construction Status of the TPS Vacuum Systems 3472
 
  • G.-Y. Hsiung, C.K. Chan, C.H. Chang, C.-C. Chang, S.W. Chang, Y.P. Chang, C.L. Chen, J.-R. Chen, Z.W. Chen, C.M. Cheng, Y.T. Cheng, S-N. Hsu, H.P. Hsueh, C.S. Huang, Y.T. Huang, T.Y. Lee, L.H. Wu, Y.C. Yang
    NSRRC, Hsinchu, Taiwan
  • J.-R. Chen
    National Tsing Hua University, Hsinchu, Taiwan
  
  The vac­uum sys­tems for the 3 GeV Tai­wan Pho­ton Source (TPS) have been con­structed since 2010. Most of the vac­uum com­po­nents and equip­ments have been man­u­fac­tured and de­liv­ered. For the elec­tron stor­age ring (SR), all the 24 cells of 14 m alu­minum vac­uum sys­tems have been welded and as­sem­bled. The vac­uum bak­ing for the cells in the lab­o­ra­tory was un­der­go­ing to achieve the ul­tra­high vac­uum pres­sure below 1×10-8 Pa. The vac­uum sys­tems ac­com­mo­dated with the in­ser­tion de­vices in the long straight sec­tions have been de­signed and under man­u­fac­tur­ing. For the booster (BR), all the stain­less steel cham­bers in­clud­ing the 0.7 mm el­lip­ti­cal cham­bers, BPM ducts, and the pump­ing cham­bers, have been man­u­fac­tured. The two trans­port lines: LTB for Linac to BR and BTS for BR to SR were man­u­fac­tured. Vac­uum cham­bers for BTS adopt the sim­i­lar cham­bers for BR but will be baked to ul­tra­high vac­uum for con­nect­ing with SR with­out in­jec­tion win­dow. The beam ducts for LTB will be made of alu­minum al­loys. The con­struc­tion works for TPS vac­uum sys­tems will be com­pleted be­fore April of 2013 while the in­stal­la­tion of the sys­tems in the TPS tun­nel will be started im­me­di­ately.