Author: Harada, H.
Paper Title Page
MOPME020 Development of the New Measurement Method for the Incoherent Tune Spread and the Tune Shift Caused by the Space Charge Effect 512
 
  • S. Kato
    Tohoku University, Graduate School of Science, Sendai, Japan
  • H. Harada, H. Hotchi, M. Kinsho, K. Okabe
    JAEA/J-PARC, Tokai-mura, Japan
  
  For the high in­ten­sity ac­cel­er­a­tor, the in­co­her­ent tune which is the fre­quency of the in­di­vid­ual par­ti­cles is shifted and de­creases due to the space charge ef­fect. In ad­di­tion, the in­co­her­ent tune is formed into spread shape com­monly. When the in­co­her­ent tune sat­is­fies a res­o­nance con­di­tion, it might be oc­curred the beam emit­tance growth and the beam loss. So it is nec­es­sary to re­duce the in­co­her­ent tune spread and the tune shift as much as pos­si­ble. To achieve this con­di­tion, it is de­sired to mea­sure the in­co­her­ent tune spread and the tune shift di­rectly. There­fore we are de­vel­op­ing the new mea­sure­ment method of the in­co­her­ent tune spread and the shift due to the space charge ef­fect. From the sim­u­la­tion re­sults, it was cleared that the beam dis­tri­b­u­tion can be mod­i­fied in the case of using the mono fre­quency di­pole ex­citer be­cause a par­ti­cle which has the tune cor­re­spond­ing to the ex­citer can be res­onated tem­po­rary. In ad­di­tion, it was cleared that it is pos­si­ble to eval­u­ate the in­co­her­ent tune spread and the tune shift by the mea­sure­ment of the dis­tri­b­u­tion tran­si­tion. We pre­sent the out­line of this method and the de­vel­op­ing plane at the J-PARC RCS.  
 
MOPME021 Ionization Profile Monitor (IPM) of J-PARC 3-GeV RCS 515
 
  • H. Harada, K. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • S. Kato
    Tohoku University, Graduate School of Science, Sendai, Japan
  
  Ion­iza­tion pro­file mon­i­tors (IPM) were in­stalled in the 3-GeV RCS ring of J-PARC and used to ob­serve the beam-pro­file for the trans­verse plane in beam com­mis­sion­ing. These elec­trodes and MCPs of IPMs were up­graded in 2012 sum­mer shut­down in order to im­prove the ex­ter­nal elec­tric field for lead­ing the elec­trons and ions to MCPs. This pre­sen­ta­tion will be de­scribed the re­sults of ob­served beam pro­file in beam com­mis­sion­ing and be dis­cussed the new is­sues for the ion and elec­tron col­lec­tion mode.  
 
MOPME022 Beam Commissioning of Two Horizontal Pulse Steering Magnets for Changing Injection Painting Area from MLF to MR in the 3-GeV RCS of J-PARC 518
 
  • P.K. Saha, H. Harada, N. Hayashi, H. Hotchi, M. Kinsho, T. Takayanagi, N. Tani
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Irie
    KEK, Ibaraki, Japan
  • S. Kato
    Tohoku University, Graduate School of Science, Sendai, Japan
  
  We have been suc­cess­fully com­mis­sioned two pulse steer­ing mag­nets in­stalled in the Linac to 3-GeV RCS (Rapid Cy­cling Syn­chro­tron) in­jec­tion beam trans­port (BT) line of J-PARC. RCS has to de­liver a si­mul­ta­ne­ous as well as spe­cific beam as de­mand by the down­stream fa­cil­i­ties of MLF (Ma­te­r­ial and Life Sci­ence Fa­cil­ity) and the MR (Main Ring). In order to ob­tain rel­a­tively a smaller trans­verse emit­tance at ex­trac­tion, those mag­nets were de­signed to per­form a smaller in­jec­tion paint­ing for the MR beam as com­pared to the MLF one. As strip­per foil po­si­tion is fixed for the charge ex­change H− in­jec­tion, in­cli­na­tion of the in­jected beam cen­troid on foil for the MR beam is only moved to a smaller value by the pulse steer­ing mag­nets, while DC sep­tum mag­nets are fixed as de­ter­mined first for the MLF beam. Their pa­ra­me­ters were found to be very con­sis­tent with ex­pec­ta­tion and thus al­ready in op­er­a­tion for switch­ing to a paint­ing area of 100 pi mm mrad for the MR beam as com­pared to that of 150 pi mm mrad for the MLF beam.  
 
MOPME023 ORBIT Beam Simulation Progress in the 3-GeV Rapid Cycling Synchrotron of J-PARC 521
 
  • P.K. Saha, H. Harada, H. Hotchi, Y. Shobuda, M. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • J.A. Holmes
    ORNL, Oak Ridge, Tennessee, USA
  • S. Kato
    Tohoku University, Graduate School of Science, Sendai, Japan
  
  We have made a nu­mer­ous progress for beam sim­u­la­tion in the 3-GeV RCS (Rapid Cy­cling Syn­chro­tron) of J-PARC (Japan Pro­ton Ac­cel­er­a­tor Re­search Com­plex) by using 3-D par­ti­cle track­ing code, ORBIT. Namely, the TEAPOT lat­tice file used for ORBIT track­ing has been made to give ex­actly same re­sults to that with SAD model used for the RCS beam com­mis­sion­ing. In ad­di­tion, time de­pen­dent lat­tice func­tions of the in­jec­tion chi­cane mag­nets and sim­i­lar other time de­pen­dent lat­tice im­per­fec­tions, which are al­ready found to have sig­nif­i­cant in­flu­ences on the beam losses in the real ma­chine have also been suc­cess­fully in­tro­duced. At pre­sent, time de­pen­dent trans­verse and lon­gi­tu­di­nal im­ped­ances are going to be in­tro­duced. That should prove the ORBIT code much more ma­tured for beam sim­u­la­tions in syn­chro­trons. Lat­est beam sim­u­la­tion re­sults il­lus­trat­ing these new re­al­is­tic fea­tures are pre­sented.  
 
THPWO032 Progress of Injection Energy Upgrade Project for J-PARC RCS 3833
 
  • N. Hayashi, H. Harada, K. Horino, H. Hotchi, J. Kamiya, M. Kinsho, P.K. Saha, Y. Shobuda, T. Takayanagi, N. Tani, T. Togashi, T. Ueno, M. Watanabe, Y. Watanabe, K. Yamamoto, M. Yamamoto, Y. Yamazaki, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Irie
    KEK, Ibaraki, Japan
  • T. Toyama
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  
  The in­jec­tion en­ergy of the J-PARC RCS will be up­graded in 2013. New power sup­plies for the shift bump mag­net sys­tem will be in­stalled. Some of other sys­tems, up­grade of the paint­ing bump power sup­plies and pulse steer­ing sys­tems, are al­ready in­stalled and tested or used for the nom­i­nal op­er­a­tion. The paper re­ports the progress of in­jec­tion en­ergy up­grade pro­ject.  
 
THPWO033 High Intensity Beam Trial of up to 540 kW in J-PARC RCS 3836
 
  • H. Hotchi, H. Harada, N. Hayashi, M. Kinsho, P.K. Saha, Y. Shobuda, F. Tamura, K. Yamamoto, M. Yamamoto, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Irie
    KEK, Ibaraki, Japan
  • S. Kato
    Tohoku University, Graduate School of Science, Sendai, Japan
  
  Re­cently we have per­formed a high in­ten­sity beam trial of up to 540 kW. In this paper, beam in­ten­sity de­pen­dece and in­jec­tion paint­ing pa­ra­me­ter de­pen­dence of beam loss, ob­served in this beam ex­per­i­ment, will be dis­cussed with the cor­re­spond­ing nu­mer­i­cal sim­u­la­tion re­sults.