Author: Hu, K.H.
Paper Title Page
MOPO015 Operation Status of Bunch-by-bunch Feedback System in the TLS 514
 
  • C.H. Kuo, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  There are sev­er­al FPGA based bunch-by-bunch feed­back sys­tems that were de­ployed in the Tai­wan Light Source now. They play var­i­ous roles to sup­press beam in­sta­bil­i­ty. By using SPring-8 de­signed feed­back pro­ces­sors is pi­o­neer to apply in the stor­age ring of TLS suc­cess­ful­ly and help Dim­tel sys­tem to be quick com­mis­sion. The Dim­tel feed­back sys­tem pro­vide a life spare unit and ex­plore to con­trol sys­tem in­te­gra­tion es­pe­cial­ly to the EPICS toolk­it sys­tem. Rich func­tion­al­i­ty in­cludes of ex­ci­ta­tion of in­di­vid­u­al bunch or spec­i­fies bunch­es, av­er­aged spec­trum, tune mea­sure­ment by the feed­back dip in the av­er­aged spec­trum. Op­er­a­tion sta­tus of the sys­tem will be sum­ma­ry in this re­port.  
 
MOPO016 Commissioning Tune Feedback in the Taiwan Light Source 517
 
  • C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao, C.Y. Wu
    NSRRC, Hsinchu, Taiwan
  
  The tune con­trol is im­por­tant pa­ram­e­ter in the in­ser­tion de­vices op­er­a­tion. There are many dif­fer­ence type in­ser­tion de­vices are dis­turbed in the stor­age ring of TLS. The tra­di­tion­al feed-for­ward con­trol to cor­rect orbit change and tune shift that isn’t enough when dif­fer­ence type in­ser­tion de­vices are op­er­at­ed with var­i­ous con­di­tion. The tune feed­back is used to solve the tune change prob­lem. The sta­ble tune mea­sure­ment is nec­es­sary in the sta­ble stor­age ring. There are var­i­ous ex­cit­ed bunch train meth­ods to get sta­ble tune that will be also dis­cussed in this re­port.  
 
MOPO040 RF Reference Distribution for the Taiwan Photon Source 571
 
  • K.H. Hu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, S.Y. Hsu, C.H. Kuo, D. Lee, C.-Y. Liao, C.Y. Wu
    NSRRC, Hsinchu, Taiwan
  
  Tai­wan Pho­ton Source (TPS) is a low-emit­tance 3-GeV syn­chrotron light source with cir­cum­fer­ence of 518.4 m which is being under con­struc­tion at Na­tion­al Syn­chrotron Ra­di­a­tion Re­search Cen­ter (NSRRC) cam­pus. Low noise 500 MHz mas­ter os­cil­la­tor and novel fiber based CW RF ref­er­ence dis­tri­bu­tion sys­tem will be em­ployed to take ad­van­tages of ad­vanced tech­nol­o­gy in this field and de­liv­er bet­ter per­for­mance. The pre­lim­i­nary test of the pro­to­type sys­tem is sum­ma­rized in this re­port.  
 
MOPO041 Preliminary Testing of TPS Timing System 574
 
  • C.Y. Wu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.-Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  The tim­ing sys­tem of Tai­wan Pho­ton Source (TPS) pro­vides syn­chro­niza­tion for elec­tron gun, mod­u­la­tors of linac, pulse mag­net power sup­plies, boost­er power sup­ply ramp, buck­et ad­dress­ing of stor­age ring, di­ag­nos­tic equip­ments, beam­line gat­ing sig­nal for top-up in­jec­tion. The tim­ing sys­tem uti­lizes a cen­tral event gen­er­a­tor to gen­er­ate events and dis­tribute them over optic fiber net­work, and de­codes them at the event re­ceivers. The sys­tem sup­ports up­link func­tion­al­i­ty which will be used for the fast in­ter­lock sys­tem to dis­tribute sig­nals like beam dump and post-mortem trig­ger. The tim­ing sys­tem has now been in op­er­a­tion for Linac of TPS. This paper pre­sents pro­to­type for the tim­ing sys­tem of TPS.  
 
TUPC144 Preliminary BPM Electrics Testing for the Taiwan Photon Source Project 1362
 
  • C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  The pre­lim­i­nary BPM electrics are de­vel­op­ing and test­ing for Tai­wan Pho­ton Source (TPS), is a 3 GeV syn­chrotron light source which being in con­struc­tion at NSRRC. This new BPM elec­tron­ics with in­te­grat­ed FPGA based hard­ware, and will be test­ing in the TLS (Tai­wan Light Source) with real beam at first. The en­hance func­tion­al­i­ty of cur­rent gen­er­a­tion will be adopt­ed in the TPS. The elec­tron­ic pro­to­type test­ing and rel­a­tive prop­er­ty will be re­port­ed in this re­port.  
 
TUPC145 Vibration and Beam Motion Monitoring in TLS 1365
 
  • Y.K. Chen, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo
    NSRRC, Hsinchu, Taiwan
  
  Due to asyn­chronous na­ture of var­i­ous vi­bra­tion and beam mo­tion re­lat­ed sub­sys­tems, it is hard to anal­y­sis the cor­re­la­tion be­tween them. There­fore, the syn­chronous dis­tribut­ed data ac­qui­si­tion sys­tem is de­signed to make an im­prove­ment for bet­ter anal­y­sis. For dif­fer­ent cir­cum­stances, the sys­tem sup­ports two data flow: one is dis­play the re­al-time data which could be archived con­tin­u­ous­ly and the other is wave­form which could be ac­quired on de­mand or trig­gered by event with high sam­pling rate. In ad­di­tion, the view­er will im­prove some use­ful fea­tures, such as trig­ger by cus­tomize sig­nal or EPICS PV record, au­to­mat­ic screen­shot and plot the mul­ti­ple his­to­ry events. The pre­lim­i­nary test re­sults and im­ple­men­ta­tion de­tails will be sum­ma­rized in this re­port.  
 
TUPC146 Beam Profiles Analysis for Beam Diagnostic Applications 1368
 
  • C.-Y. Liao, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Kuo, C.Y. Wu
    NSRRC, Hsinchu, Taiwan
  
  Beam pro­file and its anal­y­sis play an im­por­tant role in beam di­ag­nos­tics of a par­ti­cle ac­cel­er­a­tor sys­tem. Use of de­struc­tive screen mon­i­tor or non-de­struc­tive syn­chrotron ra­di­a­tion mon­i­tor for beam pro­file mea­sure­ment is a sim­ple way and has been wide­ly used in syn­chrotron light source fa­cil­i­ty. An­a­lyze beam pro­files can ob­tain beam pa­ram­e­ters in­clud­ing beam cen­ter, σ, and tilt angle which has be­come a use­ful tool for beam di­ag­nos­tic. In this re­port the com­par­i­son of fit­ting strate­gies af­fect the anal­y­sis re­sults are stud­ied. The com­put­er sim­u­lat­ed beam pro­files with dif­fer­ent back­ground noise level and con­di­tions are used to eval­u­ate the com­put­ing time, and the es­ti­mat­ed fit­ting er­rors.  
 
WEPC156 Virtual Power Supply Control Environment for the TPS Project 2349
 
  • Y.-S. Cheng, Y.-T. Chang, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.-Y. Liao, C.Y. Wu
    NSRRC, Hsinchu, Taiwan
  
  The Tai­wan Pho­ton Source (TPS) is the lat­est gen­er­a­tion of 3 GeV syn­chrotron light source which has been under con­struc­tion since 2010. The con­trol sys­tem in­fras­truc­ture of TPS pro­ject is based upon the EPICS frame­work. In order to de­vel­op the con­trol ap­pli­ca­tions be­fore power sup­plies of mag­nets de­liv­ered, it is nec­es­sary to set up the vir­tu­al con­trol en­vi­ron­ment to de­vel­op high level ap­pli­ca­tion pro­grams for the power sup­plies of mag­nets in ad­vance. The high level ap­pli­ca­tion pro­grams in­clude op­er­a­tion pro­cess, de­gauss pro­cess and etc. for power sup­plies of mag­net. The soft-IOCs (Input Out­put Con­troller) and var­i­ous database records are need­ed to be built to sim­u­late the power sup­ply con­trol en­vi­ron­ment. In ad­di­tion, the op­er­a­tion in­ter­faces of power sup­ply will be de­signed and in­te­grat­ed ac­cord­ing to lo­ca­tion prop­er­ties. The ef­forts will be de­scribed at this re­port.  
 
WEPC157 Post-mortem Analysis at TLS 2352
 
  • Y.R. Pan, Y.-T. Chang, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.-Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  High avail­abil­i­ty and sta­bil­i­ty of the beam are im­por­tant is­sues for the syn­chrotron light source. An­a­lyz­ing of the post-mortem data is one of the most im­por­tant ap­proach­es to re­flect the ma­chine error and iden­ti­fy the rea­son of beam trip. The post-mortem sys­tem has been de­vel­oped at Tai­wan Light Source (TLS) in 2008. This di­ag­nos­tic data can pro­vide use­ful in­for­ma­tion for trou­bleshoot­ing and im­prove the beam re­li­a­bil­i­ty. The var­i­ous di­ag­nos­tic sig­nals are read from hard­ware buffer and writ­ten to the file sys­tem by the post-mortem event trig­ger, which is gen­er­at­ed by the sig­nals of the beam trip de­tec­tor, the su­per­con­duct­ing RF sys­tem in­ter­lock and the su­per­con­duct­ing in­ser­tion de­vice in­ter­lock. In this re­port a pro­cess­ing is run­ning to check whether a new trip event, prompt­ly find out the un­usu­al sig­nals, and gen­er­ate an an­a­lyz­ing re­sult mes­sage. The de­tail will be dis­cussed and sum­ma­rized.