• P.C. Chiu, J. Chen, Y.K. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Kuo
  NSRRC, Hsinchu

To keep and achieve de­sired per­for­mance of a mod­ern syn­chrotron light source, it re­quires con­tin­u­ous ef­forts in­clud­ing good de­sign of the ac­cel­er­a­tor, good per­formed sub­sys­tems and so­phis­ti­cat­ed feed­back sys­tem. While some won­ders hap­pen un­ex­pect­ed­ly and could de­te­ri­o­rate per­for­mance of the light source. For ex­am­ples, some strong source oc­ca­sion­al­ly oc­curred es­pe­cial­ly after long shut down or mal­func­tion of some cor­rec­tor power sup­ply and it would re­sult in in­creased noise level. Non ideal in­jec­tion el­e­ment will cause large per­tur­ba­tion as well. This re­port pre­sents al­go­rithms to spa­tial­ly lo­cate source and sum­ma­rize some of our prac­ti­cal ex­pe­ri­ence to iden­ti­fy the source.

• K.L. Tsai, C.-T. Chen, Y.-S. Cheng, C.-S. Fann, K.T. Hsu, S.Y. Hsu, K.H. Hu, K.-K. Lin, C.Y. Wu
  NSRRC, Hsinchu
• Y.-C. Liu
  National Tsing-Hua University, Hsinchu

The test re­sults of a dual one-turn coils con­fig­u­ra­tion for Tai­wan Light Source (TLS) boost­er ex­trac­tion kick­er is pre­sent­ed in this re­port. The achieved ca­pa­bil­i­ty of the test unit demon­strates that the rise-time of the kick­er cur­rent pulse has been im­proved for beam ex­trac­tion op­ti­miza­tion. This im­proved per­for­mance is main­ly ac­com­plished by re­duc­ing the load in­duc­tance ef­fec­tive­ly with a dual one-turn coils con­fig­u­ra­tion. The mea­sured re­sult of rise-time vari­a­tion ver­sus the cor­re­spond­ing load in­duc­tance change is briefly dis­cussed.

• Y.K. Chen, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Wu
  NSRRC, Hsinchu

Mod­bus-TCP is a wide­ly used in in­dus­try for a long time and ac­cel­er­a­tor con­trol sys­tem re­cent­ly. Mod­bus pro­to­col over Eth­er­net has ad­van­tages for non re­al-time ap­pli­ca­tions due to its ma­tu­ri­ty. The TPS (Tai­wan Pho­ton Source) pro­ject will have many Mod­bus-TCP en­able de­vices which dis­tribut­ed in util­i­ty sys­tem and ac­cel­er­a­tor sys­tem. The ac­cel­er­a­tor con­trol en­vi­ron­ment of TPS pro­ject is an EPICS toolk­it based sys­tem. Mod­bus-TCP might adopt for some sub­sys­tems. There are sev­er­al pos­si­ble Mod­bus-TCP de­vices in­clud­ing the pro­to­type power sup­ply for mag­net field map­ping ap­pli­ca­tion equip with Mod­bus-TCP in­ter­face, vac­u­um sys­tem local con­troller, front-end con­troller, and some mon­i­tor­ing de­vices. In this paper, we will sum­marise prepa­ra­tion ef­forts to ac­com­mo­date the Mod­bus-TCP sup­port in the TPS con­trol sys­tem.

• Y.-S. Cheng, J. Chen, Y.K. Chen, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Wu
  NSRRC, Hsinchu

To en­hance wave­form and spec­trum re­mote ac­cess sup­ports in the Tai­wan Light Source (TLS), de­vel­op­ment of the EPICS sup­port of Eth­er­net-based os­cil­lo­scope and spec­trum an­a­lyz­er for the TLS is under way. The EPICS plat­forms which built to in­ter­face these in­stru­ments could ac­cess the wave­form and spec­trum through the PV (Pro­cess Vari­able) chan­nel ac­cess. By using re­mote op­er­a­tions of wave­form and spec­trum ac­qui­si­tion, long dis­tance ca­bling could be elim­i­nat­ed and sig­nal qual­i­ty be im­proved. The EDM (Ex­ten­si­ble Dis­play Man­ag­er) tool is used to im­ple­ment the op­er­a­tion in­ter­face of con­trol con­sole and pro­vide wave­form dis­play. Ac­cord­ing to spe­cif­ic pur­pose use, dif­fer­ent graph­i­cal user in­ter­faces to in­te­grate wave­form and spec­trum ac­qui­si­tion are built. This pro­ject is the prepa­ra­tion for fu­ture con­trol room in­te­gra­tion with the Tai­wan Pho­ton Source con­trol room. The ef­forts will be de­scribed at this re­port.

• K.T. Hsu, Y.-T. Chang, J. Chen, Y.K. Chen, Y.-S. Cheng, P.C. Chiu, S.Y. Hsu, K.H. Hu, C.H. Kuo, D. Lee, Y.R. Pan, C.-J. Wang, C.Y. Wu
  NSRRC, Hsinchu

Im­ple­men­ta­tion of the Con­trol sys­tem for the Tai­wan Pho­ton Source (TPS) is on going. The TPS con­trol sys­tem will pro­vide ver­sa­tile en­vi­ron­ments for ma­chine com­mis­sion­ing, op­er­a­tion, and to do ac­cel­er­a­tor ex­per­i­ments. The con­trol sys­tem is based on EPICS toolk­its. Test-bed has set up for var­i­ous de­vel­op­ments. The open ar­chi­tec­ture will fa­cil­i­tate ma­chine up­grade, mod­i­fi­ca­tion eas­i­ly and min­i­mize ef­forts for ma­chine main­te­nance. Per­for­mance and re­li­a­bil­i­ty of the con­trol sys­tem will be guar­an­teed from the de­sign phase. De­vel­op­ment sta­tus will be sum­ma­ry in this re­port.

• P.C. Chiu, J. Chen, Y.K. Chen, Y.-S. Cheng, K.T. Hsu, C.H. Kuo, C.Y. Wu
  NSRRC, Hsinchu

In order to help early de­vel­op­ment of TPS con­trol sys­tem and user in­ter­face, a vir­tu­al ac­cel­er­a­tor model is con­struct­ed. The vir­tu­al ac­cel­er­a­tor has been cre­at­ed by AT tool­box and sim­u­lat­ed beam be­hav­ior; the Mid­dle Layer pro­vid­ing high level ac­cel­er­a­tor ap­pli­ca­tion is also used. LabCA in­ter­faces be­tween Mat­lab and EPICS (Ex­per­i­men­tal Physics and In­dus­tri­al Con­trol Sys­tem). Such a sys­tem could speed de­vel­op­ment of com­mis­sion­ing re­quired soft­ware and ex­am­ine the cor­rec­tion of all pro­ce­dures.

• C.Y. Wu, J. Chen, Y.-S. Cheng, C.-S. Fann, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Kuo, D. Lee, K.-K. Lin
  NSRRC, Hsinchu
• K. Furukawa, J.-I. Odagiri
  KEK, Ibaraki

The EPICS em­bed­ded pro­grammable logic con­troller (PLC) has been de­vel­oped based on F3R­P61-2L, a CPU mod­ule of a FA-M3R se­ries PLC run­ning Linux OS. The EPICS IOC resid­ed in F3R­P61-2L mod­ule can ac­cess the reg­is­ters of se­quence CPU mod­ules and I/O mod­ules of the PLC. The em­bed­ded EPICS PLC was ap­plied to con­trol the pro­to­type of pulse mag­net power sup­ply and sup­port func­tion­al­i­ty test­ing re­mote­ly. The sys­tem com­pris­es var­i­ous input/out­put mod­ules and a CPU mod­ule with built-in Eth­er­net in­ter­face. The con­trol in­for­ma­tion (sta­tus of the power sup­ply, ON, OFF, warn up, reset, read/write volt­age, etc.) can be ac­cessed re­mote­ly using EPICS client tools. The EDM is se­lect­ed to de­vel­op the GUI for it­self. Ef­forts are sum­ma­rized in this re­port.

• C.H. Kuo, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu
  NSRRC, Hsinchu

As the lat­est gen­er­a­tion light source, TPS (Tai­wan Pho­ton Source) has strin­gent re­quire­ments to per­form sub­mi­cron beam sta­bil­i­ty with low emit­tance. The slow and fast cor­rec­tors of in­te­grat­ed orbit feed­back sys­tem have been de­signed for TPS pro­ject, there­fore some feed­back sys­tem de­signed based on them an op­er­a­tion ex­pe­ri­ences from TLS. This re­port will pre­sent per­for­mance sim­u­la­tion and the ini­tial de­sign of sys­tem in­fras­truc­ture for large scale cal­cu­la­tion and wide band­width com­mu­ni­ca­tion. To per­form this re­quire­ment, FP­GA-based plat­form will be im­ple­ment­ed to achieve low la­ten­cy and fast com­pu­ta­tion. Some stud­ies of in­te­grat­ed feed­back loop, com­mu­ni­ca­tion struc­ture, de­vices con­trol such as BPM elec­tron­ics and cor­rec­tor power sup­plies are also de­scribed.

• K.-B. Liu, K.T. Hsu, Y.D. Li, B.S. Wang
  NSRRC, Hsinchu
• J.C. Hsu
  CMS/ITRI, Hsinchu

Based on the re­quire­ment of beam sta­bil­i­ty for the third-gen­er­a­tion syn­chrotron ra­di­a­tion light source is more strin­gent, lower rip­ple and high­er band­width of out­put cur­rent of cor­rec­tor mag­net power con­vert­ers should be de­vel­oped to im­ple­ment the closed orbit cor­rec­tion of Tai­wan Photo Source (TPS). The ±10A/±50V cor­rec­tor mag­net power con­vert­er uses a full bridge con­fig­u­ra­tion, the switch­ing fre­quen­cy of power MOS­FET is 40 kHz, in that each bridge leg has its own in­de­pen­dent PWM con­troller and the out­put cur­rent band­width is 1 kHz when con­nect­ed with the cor­rec­tor mag­net load. Using a DCCT as the cur­rent feed­back com­po­nent the out­put cur­rent rip­ple of this con­vert­er could be lower than 5 ppm. In this paper, we will de­scribe the hard­ware struc­ture and con­trol method of the cor­rec­tor mag­net power con­vert­er and the test re­sults will be demon­strat­ed.

• K.-B. Liu, K.T. Hsu, Y.D. Li, B.S. Wang
  NSRRC, Hsinchu

The Tai­wan Pho­ton Source (TPS), a third-gen­er­a­tion syn­chrotron ra­di­a­tion light source, should be in­stalled with 1032 sets of mag­net power sup­plies for the stor­age ring and 152 sets for the in­jec­tor. All of the power sup­plies are pre­ferred in PWM switched mode with IGBT or MOS­FET. A high pre­ci­sion DC power sup­ply for 48 dipoles of the stor­age ring; there are 240 quadrupole mag­nets and 168 sex­tupole mag­nets in stor­age ring, the main wind­ing of quadrupole and 168 sex­tupole mag­nets are pow­ered by in­di­vid­u­al power sup­plies. In the boost­er ring, one set of dy­nam­ic power sup­ply for the dipole mag­nets and four sets for quadrupole mag­nets run at the bi­ased 3Hz quasi si­nu­soidal wave. There are sev­er­al hun­dred cor­rec­tor (fast and slow) mag­nets and skew quadrupole mag­nets in stor­age ring and in­jec­tor are pow­ered by the same bipo­lar power con­vert­ers.

• B.S. Wang, K.T. Hsu, Y.D. Li, K.-B. Lin, K.-B. Liu
  NSRRC, Hsinchu

This paper pre­sents an im­ple­men­ta­tion of a pre­ci­sion cor­rec­tor mag­net power con­vert­er using the dig­i­tal­ly con­trolled pulse width mod­u­la­tion method. The out­put cur­rent pre­ci­sion of this ±10A/±50V cor­rec­tor mag­net power con­vert­er is with­in ±10ppm. The dig­i­tal con­trol cir­cuit of the power con­vert­er is im­ple­ment­ed with using a high speed AD­S8382 18-bits ana­log-to-dig­i­tal con­vert­er and a TM­S320F28335 dig­i­tal sig­nal pro­ces­sor. The con­vert­er uses a full bridge con­fig­u­ra­tion, the switch­ing fre­quen­cy of power MOS­FET is 40 kHz and the con­trol res­o­lu­tion is 17-bits. Using a DCCT as the cur­rent feed­back com­po­nent the out­put cur­rent rip­ple of this con­vert­er could be lower than 5 ppm that is be­yond the re­quire­ment of TLS cor­rec­tor power con­vert­er and suit­able to be used in TPS.

• K.L. Tsai, C.-T. Chen, Y.-S. Cheng, C.-S. Fann, K.T. Hsu, S.Y. Hsu, K.-K. Lin, K.-B. Liu
  NSRRC, Hsinchu
• Y.-C. Liu
  National Tsing-Hua University, Hsinchu

A test unit of a pulse-form­ing-net­work (PFN) kick­er power sup­ply has been de­signed and fab­ri­cat­ed for Tai­wan Pho­ton Source (TPS) beam in­jec­tion/ex­trac­tion of the boost­er ring. In order to ful­fill the re­quire­ments, the per­for­mance of the de­signed unit has been bench test­ed and the re­sults are ex­am­ined for eval­u­a­tion pur­pose. The pulse-to-pulse sta­bil­i­ty and the flat­top spec­i­fi­ca­tions are spec­i­fied ac­cord­ing to the beam in­jec­tion/ex­trac­tion re­quire­ments. Ef­fort has been made to en­hance the rise/fall time of the de­liv­ered pulse cur­rent. The en­gi­neer­ing eval­u­a­tion and its pos­si­ble ap­pli­ca­tion for beam di­ag­nos­tics pur­pose are briefly dis­cussed.

• F.H. Tseng, H.-P. Chang, J. Chen, P.C. Chiu, K.T. Hsu, C.-C. Kuo, H.-J. Tsai
  NSRRC, Hsinchu

Tai­wan Pho­ton Source (TPS) is the sec­ond syn­chrotron light source in Tai­wan which is cur­rent­ly under con­struc­tion at the NSRRC ex­ist­ing site. With a 3 GeV beam en­er­gy, low emit­tance, 24-DB struc­ture in the stor­age ring, the TPS can gen­er­ate high­er bril­liance and more abun­dant X-ray sources. TPS is in com­ple­men­tary to the over­booked 1.5 GeV Tai­wan Light Source (TLS). The MAT­LAB-based ac­cel­er­a­tor physics ap­pli­ca­tion pro­grams planned for the TPS com­mis­sion­ing and op­er­a­tion is a high-lev­el soft­ware col­lec­tion in­clud­ing the MML, AT, LOCO, etc., de­vel­oped at ALS and SLAC. In this re­port, the test­ing re­sults by em­ploy­ing this pack­age to the Tai­wan Light Source (TLS) are given and the sim­u­la­tions of the TPS vir­tu­al ma­chine are also demon­strat­ed.