Author: Lin, H.Y.
Paper Title Page
MOPAB380 Status and Progress of the RF System for High Energy Photon Source 1165
 
  • P. Zhang, J. Dai, Z.W. Deng, L. Guo, T.M. Huang, D.B. Li, J. Li, Z.Q. Li, H.Y. Lin, Y.L. Luo, Q. Ma, F. Meng, Z.H. Mi, Q.Y. Wang, X.Y. Zhang, F.C. Zhao, H.J. Zheng
    IHEP, Beijing, People’s Republic of China
 
  Funding: This work was supported in part by High Energy Photon Source, a major national science and technology infrastructure in China and in part by the Chinese Academy of Sciences.
High En­ergy Pho­ton Source (HEPS) is a 6 GeV dif­frac­tion-lim­ited syn­chro­tron light source cur­rently under con­struc­tion in Bei­jing. It adopts a dou­ble-fre­quency RF sys­tem with 166.6 MHz as fun­da­men­tal and 499.8 MHz as third har­monic. The fun­da­men­tal cav­ity is mak­ing use of a su­per­con­duct­ing quar­ter-wave β=1 struc­ture and the third har­monic is of su­per­con­duct­ing el­lip­ti­cal sin­gle-cell geom­e­try for the stor­age ring, while nor­mal-con­duct­ing 5-cell cav­i­ties are cho­sen for the booster ring. A total of 900 kW RF power shall be de­liv­ered to the beam by the 166.6 MHz cav­i­ties and the third har­monic cav­i­ties are ac­tive. All cav­i­ties are dri­ven by solid-state power am­pli­fiers and the RF fields are reg­u­lated by dig­i­tal low-level RF con­trol sys­tems. The cav­ity and an­cil­lar­ies, high-power RF sys­tem and low-level RF con­trol sys­tem are in the pro­to­typ­ing phase. This paper pre­sents the cur­rent sta­tus and progress of the RF sys­tem for HEPS.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB380  
About • paper received ※ 09 May 2021       paper accepted ※ 09 June 2021       issue date ※ 24 August 2021  
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MOPAB390 Development of a 166.6 MHz Low-Level RF System by Direct Sampling for High Energy Photon Source 1189
 
  • D.B. Li, H.Y. Lin, Q.Y. Wang, P. Zhang
    IHEP, Beijing, People’s Republic of China
 
  Funding: This work was supported by High Energy Photon Source, a major national science and technology infrastructure in China.
A dig­i­tal low-level radio fre­quency (LLRF) sys­tem by di­rect sam­pling has been pro­posed for 166.6 MHz su­per­con­duct­ing cav­i­ties at High En­ergy Pho­ton Source (HEPS). The RF field in­side the cav­i­ties has to be con­trolled bet­ter than ±0.1% (peak to peak) in am­pli­tude and ±0.1 deg (peak to peak) in phase. Con­sid­er­ing that the RF fre­quency is 166.6 MHz, which is well within the ana­log band­width of mod­ern high-speed ADCs and DACs, di­rect RF sam­pling and di­rect dig­i­tal mod­u­la­tion can be achieved. A dig­i­tal LLRF sys­tem uti­liz­ing di­rect sam­pling has there­fore been de­vel­oped with em­bed­ded ex­per­i­men­tal physics and in­dus­trial con­trol sys­tem (EPICS) in the field pro­gram­ma­ble gate array (FPGA). The per­for­mance in the lab has been char­ac­ter­ized in a self-closed loop with a resid­ual peak-to-peak noise of ±0.05% in am­pli­tude and ±0.03 deg in phase, which is well below the HEPS spec­i­fi­ca­tions. Fur­ther tests on a warm 166.6 MHz cav­ity in the lab are also pre­sented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB390  
About • paper received ※ 17 May 2021       paper accepted ※ 09 June 2021       issue date ※ 30 August 2021  
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TUPAB346 Development of a 500-MHz 150-kW Solid-State Power Amplifier for High Energy Photon Source 2312
 
  • Y.L. Luo, T.M. Huang, J. Li, H.Y. Lin, Q. Ma, Q.Y. Wang, P. Zhang, F.C. Zhao
    IHEP, Beijing, People’s Republic of China
 
  A 500-MHz 150-kW solid-state power am­pli­fier (SSA) has been de­vel­oped to test the 500-MHz nor­mal con­duct­ing cav­i­ties for High En­ergy Pho­ton Source (HEPS) booster ring. It will also be used to power nor­mal con­duct­ing cav­i­ties in the ini­tial beam com­mis­sion­ing stage of the HEPS stor­age ring. A total num­ber of 96 am­pli­fier mod­ules are com­bined ini­tially by coax­ial and later by wave­guide com­bin­ers to de­liver the 150-kW RF power. The final out­put is of EIA stan­dard WR1800 rec­tan­gu­lar wave­guide. Each am­pli­fier mod­ule con­sists four tran­sis­tors equipped with in­di­vid­ual cir­cu­la­tor and load and out­puts 2-kW RF power. Mod­u­lar­ity, re­dun­dancy and sat­is­fac­tory RF per­for­mance are demon­strated. In the final stage of HEPS pro­ject, this 150-kW am­pli­fier will be mod­i­fied to a 100-kW am­pli­fier to join the other five 100-kW SSAs for nor­mal op­er­a­tion of the booster cav­i­ties. The de­vel­op­ment and test re­sults are pre­sented in this paper.  
poster icon Poster TUPAB346 [1.870 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB346  
About • paper received ※ 19 May 2021       paper accepted ※ 21 June 2021       issue date ※ 15 August 2021  
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TUPAB347 Development of a 166-MHz 260-kW Solid-State Power Amplifier for High Energy Photon Source 2315
 
  • Y.L. Luo, T.M. Huang, J. Li, H.Y. Lin, Q. Ma, Q.Y. Wang, P. Zhang, F.C. Zhao
    IHEP, Beijing, People’s Republic of China
 
  166-MHz 260-kW solid-state power am­pli­fiers have been cho­sen to drive the 166.6-MHz su­per­con­duct­ing cav­i­ties for the stor­age ring of High En­ergy Pho­ton Source. Highly mod­u­lar yet com­pact are de­sired. A total num­ber of 112 am­pli­fier mod­ules of 3 kW each are com­bined in a multi-stage power com­bin­ing topol­ogy. The final out­put is of 9-3/16" 50 Ω coax­ial rigid line. Each am­pli­fier mod­ule con­sists of 3 LDMOS tran­sis­tors with in­di­vid­ual cir­cu­la­tor and load. Ther­mal sim­u­la­tions of the am­pli­fier mod­ule have been con­ducted to op­ti­mize cool­ing ca­pa­bil­i­ties for both trav­el­ling-wave and full-re­flec­tion op­er­a­tion sce­nar­ios. High ef­fi­ciency, suf­fi­cient re­dun­dancy and ex­cel­lent RF per­for­mances of the 260-kW sys­tem are demon­strated. A con­trol sys­tem is also in­te­grated and EPICS is used to man­age the mon­i­tored data. The de­sign and test re­sults of the am­pli­fier sys­tem are pre­sented in this paper.  
poster icon Poster TUPAB347 [1.972 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB347  
About • paper received ※ 19 May 2021       paper accepted ※ 21 June 2021       issue date ※ 29 August 2021  
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WEPAB394 Development of a New Interlock and Data Acquisition for the RF System at High Energy Photon Source 3630
 
  • Z.W. Deng, J.P. Dai, H.Y. Lin, Q.Y. Wang, P. Zhang
    IHEP, Beijing, People’s Republic of China
 
  Funding: This work was supported by High Energy Photon Source, a major national science and technology infrastructure in China.
A new in­ter­lock and data ac­qui­si­tion (DAQ) sys­tem is being de­vel­oped for the RF sys­tem at High En­ergy Pho­ton Source (HEPS) to pro­tect es­sen­tial de­vices as well as to lo­cate the fault. Var­i­ous sig­nals col­lected and pre-processed by the DAQ sys­tem and in­di­vid­ual in­ter­lock sig­nals from solid-state power am­pli­fiers, low-level RFs, arc de­tec­tors, etc. are sent to the in­ter­lock sys­tem for logic de­ci­sion to con­trol the RF switch. Pro­gram­ma­ble logic con­trollers (PLC) are used to col­lect slow sig­nals like tem­per­a­ture, water flowrate, etc., while fast ac­qui­si­tion for RF sig­nals is re­al­ized by ded­i­cated boards with down-con­ver­sion fron­tend and dig­i­tal sig­nal pro­cess­ing boards. In order to im­prove the re­sponse time, field pro­gram­ma­ble gate array (FPGA) has been used for in­ter­lock logic im­ple­men­ta­tion with an em­bed­ded ex­per­i­men­tal physics and in­dus­trial con­trol sys­tem (EPICS). Data stor­age is man­aged by using EPICS Archiver Ap­pli­ance and an op­er­a­tor in­ter­face is de­vel­oped by using Con­trol Sys­tem Stu­dio (CSS) run­ning on a stand­alone com­puter. This paper pre­sents the de­sign and the first test of the new in­ter­lock and DAQ for HEPS RF sys­tem.
 
poster icon Poster WEPAB394 [2.140 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB394  
About • paper received ※ 16 May 2021       paper accepted ※ 14 July 2021       issue date ※ 31 August 2021  
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WEPAB402 Status and Progress of the High-Power RF System for High Energy Photon Source 3653
 
  • T.M. Huang, J. Li, H.Y. Lin, Y.L. Luo, Q. Ma, W.M. Pan, P. Zhang, F.C. Zhao
    IHEP, Beijing, People’s Republic of China
 
  Funding: Work was supported in part by High Energy Photon Source, a major national science and technology infrastructure in China, and in part by the National Natural Science Foundation of China(12075263).
High En­ergy Pho­ton Source is a 6-GeV dif­frac­tion-lim­ited syn­chro­tron light source cur­rently under con­struc­tion in Bei­jing. Three types of high-power RF sys­tems are used to drive the booster and the stor­age ring. For the booster ring, a total of 600-kW con­tin­u­ous-wave (CW) RF power is gen­er­ated by six 500-MHz solid-state power am­pli­fiers (SSA) and fed into six nor­mal-con­duct­ing cop­per cav­i­ties. Con­cern­ing the stor­age ring, five CW 260-kW SSAs at 166 MHz and two CW 260-kW SSAs at 500-MHz are used to drive five fun­da­men­tal and two third-har­monic su­per­con­duct­ing cav­i­ties re­spec­tively. The RF power dis­tri­b­u­tions are re­al­ized by 9-3/16" rigid coax­ial line for the 166-MHz sys­tem and EIA stan­dard WR1800 wave­guide for the 500-MHz one. High-power cir­cu­la­tors and loads are in­stalled at the out­puts of all SSAs to fur­ther pro­tect the power trans­mit­ters from dam­ages due to re­flected power al­though each am­pli­fier mod­ule is equipped with in­di­vid­ual iso­la­tors. The over­all sys­tem lay­out and the progress of the main com­po­nents are pre­sented in this paper.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB402  
About • paper received ※ 18 May 2021       paper accepted ※ 02 July 2021       issue date ※ 14 August 2021  
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