Author: Huang, W.L.
Paper Title Page
WEPFI027 The Measurement of the Ferrite Rings for the Mass Production RF Cavity of CSNS RCS 2762
 
  • H. Shi, W.L. Huang, B. Jiang, X. Li, W. Long, W.Y. Song, H. Sun, J.Y. Tang, C.L. Xie, C.L. Zhang, W. Zhang
    IHEP, Beijing, People's Republic of China
  
  The Rapid Cy­cling Syn­chro­tron (RCS) of the China Spal­la­tion Neu­tron Source (CSNS) will in­stall 8 fer­rite-loaded coax­ial res­o­nant cav­i­ties. The con­struc­tion and mea­sure­ment of pro­to­type cav­ity have been fin­ished. Based on the ex­ist­ing ex­pe­ri­ences, the small inner di­am­e­ter (ID) rings T500/250/25-4M2 (mm) have been adopted for the mass pro­duc­tion RF cav­ity, and the test re­sults have shown that such rings can bear more RF mag­netic flux den­sity and have lower power loss. The char­ac­ter­is­tics of 60 small ID rings have been mea­sured with two-ring test sys­tem, and we fig­ured out that the rings have good con­sis­tence and the shunt im­ped­ance of all rings is above 100 Ω.  
 
WEPFI028 RF System of the CSNS Synchrotron 2765
 
  • H. Sun, W.L. Huang, X. Li, W. Long, H. Shi, C.L. Zhang, F.C. Zhao
    IHEP, Beijing, People's Republic of China
  
  The ac­cel­er­a­tor of China Spal­la­tion Neu­tron Source (CSNS) con­sists of a H− linac and a rapid cy­cling syn­chro­tron (RCS). The pro­tons in­jected into the RCS will be ac­cel­er­ated from 81MeV to 1.6GeV by the Ring RF sys­tem pro­vid­ing a max­i­mum ac­cel­er­at­ing volt­age of 165kV. The RF fre­quency sweeps from 1.02 MHz to 2.44 MHz. with a rep­e­ti­tion rate of 25Hz. The fer­rite-loaded RF cav­i­ties will be used in the ring RF sys­tem. Each cav­ity has own RF power tube am­pli­fier, bias cur­rent sup­ply and full dig­i­tal LLRF con­trol loops. The R&D of ring rf sys­tem have been com­pleted, it com­pose of the pro­to­types of a full size fer­rite loaded RF cav­ity, a high power tetrode am­pli­fier, a switch­ing type bias sup­ply of 3000A and a full dig­i­tal em­bed­ded con­troller of LLRF. CSNS ring RF sys­tem de­sign and the re­sults of the R&D will be de­scribed in this paper.  
 
WEPFI063 Progress on the ISIS Synchrotron Low Power RF System Upgrade 2839
 
  • A. Seville, D.B. Allen, D. Bayley, N.E. Farthing, I.S.K. Gardner, R.J. Mathieson
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • W.L. Huang
    IHEP, Beijing, People's Republic of China
  
  The ISIS syn­chro­tron at the Ruther­ford Ap­ple­ton Lab­o­ra­tory in the UK now rou­tinely uses a dual har­monic RF sys­tem to ac­cel­er­ate beam cur­rents in ex­cess of 230 uA to op­er­ate two tar­get sta­tions si­mul­ta­ne­ously. To give more sta­ble con­trol of the RF volt­age at each of the fun­da­men­tal (1RF) and sec­ond har­monic (2RF) cav­i­ties, changes have been made to the low power RF (LPRF) con­trol sys­tems. A new FPGA based mas­ter os­cil­la­tor has been im­ple­mented using a Na­tional In­stru­ments FlexRIO mod­ule. The re­place­ment mas­ter os­cil­la­tor has been tested with beam for the first time. This paper re­ports on the tests of the FlexRIO mas­ter os­cil­la­tor and de­scribes plans for the grad­ual re­place­ment of the re­main­ing parts of the LPRF sys­tem.