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Noumi, H.

Paper Title Page
MOPE024 Development of Radiation Registant Optics System for High Intensity Proton Beamline at the J-PARC 1017
 
  • A. Toyoda, A. Agari, E. Hirose, M. Ieiri, Y. Katoh, A. Kiyomichi, M. Minakawa, T.M. Mitsuhashi, R. Muto, M. Naruki, Y. Sato, S. Sawada, Y. Suzuki, H. Takahashi, M. Takasaki, K.H. Tanaka, H. Watanabe, Y. Yamanoi
    KEK, Tsukuba
  • H. Noumi
    RCNP, Osaka
  
 

Op­ti­cal beam mea­sure­ment such as OTR(Op­ti­cal Tran­si­tion Ra­di­a­tion), ODR(Op­ti­cal Diffrac­tion Ra­di­a­tion), gas Cerenkov, and so on is a pow­er­ful tool to ob­serve a two-di­men­sion­al in­for­ma­tion of high in­ten­si­ty beam pro­file, so that this method is wide­ly used at var­i­ous elec­tron and hadron ac­cel­er­a­tors. How­ev­er, high ra­di­a­tion field to dam­age an op­ti­cal sys­tem grad­u­al­ly be­comes a major issue with in­creas­ing the beam in­ten­si­ty to ex­plore new physics. Our pre­sent ef­fort is de­vot­ed to de­vel­op a high ef­fi­cient op­ti­cal sys­tem to re­sist such high ra­di­a­tion field. We newly de­signed an op­ti­cal sys­tem com­posed of two spher­i­cal mir­rors which do not have any lens­es vul­ner­a­ble to ra­di­a­tion. De­tailed op­tics de­sign and a re­sult of op­ti­cal per­for­mance test will be pre­sent­ed. Also we will re­port a re­sult of a beam test ex­per­i­ment of this op­tics sys­tem com­bined with an OTR screen per­formed at high in­ten­si­ty pro­ton ex­trac­tion beam­line of the J-PARC.

  
THPEC045 Electrostatic Separator and K1.8 Secondary Beamline at the J-PARC Hadron-Hall 4161
 
  • M. Ieiri, A. Agari, E. Hirose, Y. Katoh, M. Minakawa, R. Muto, M. Naruki, Y. Sato, S. Sawada, Y. Suzuki, H. Takahashi, T. Takahashi, M. Takasaki, K.H. Tanaka, A. Toyoda, H. Watanabe, Y. Yamanoi
    KEK, Tsukuba
  • H. Noumi
    RCNP, Osaka
  
 

In the hadron ex­per­i­men­tal hall at the 50-GeV Pro­ton Syn­chrotron (PS) of J-PARC, the sec­ondary beam line K1.8 with dou­ble stage sep­a­ra­tor is ex­pect­ed to pro­vide 1-2 GeV/c kaon beams with less con­tam­i­na­tion of pions main­ly for hadron and nu­cle­ar physics ex­per­i­ments with strangeness. An elec­tro­stat­ic (ES) sep­a­ra­tor is one of key el­e­ments of this sec­ondary beam line. The ES sep­a­ra­tor will gen­er­ate a 75kV/cm elec­tro­stat­ic field be­tween par­al­lel elec­trodes of 10cm gap and 6m in length along the beam di­rec­tion. It is de­signed so as to be ra­di­a­tion-proof and to lower spark rate at the high in­ten­si­ty pro­ton ac­cel­er­a­tor fa­cil­i­ty. The K1.8 line has two 6m ES sep­a­ra­tors with the in­ter­me­di­ate focal point up­stream of sep­a­ra­tors to re­duce the pion back­grounds from the pro­duc­tion tar­get. The K-/π- ratio of the line is ex­pect­ed to have a larg­er value than 1 at the ex­per­i­men­tal tar­get. Beam com­mis­sion­ing of the K1.8 has just start­ed. We will re­port sep­a­ra­tor per­for­mance, op­tics de­sign of the K1.8 beam line and the first re­sult of the beam com­mis­sion­ing.