Author: Otani, M.
Paper Title Page
MOPAB325 Development of Bunch Width Monitor with High Time Resolution for Low Emittance Muon Beam in the J-PARC Muon g-2 / EDM Experiment 1004
 
  • M. Yotsuzuka, T. Iijima, K. Inami, Y. Sue, K. Sumi
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • T. Iijima
    KMI, Nagoya, AIchi Prefecture, Japan
  • Y. Kondo
    JAEA, Ibaraki-ken, Japan
  • T. Mibe
    KEK, Tsukuba, Japan
  • Y. Nakazawa
    Ibaraki University, Ibaraki, Japan
  • M. Otani, N. Saito
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • Y. Takeuchi
    Kyushu University, Fukuoka, Japan
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
  
  The J-PARC muon g-2/EDM ex­per­i­ment plans to mea­sure the muon anom­alous mag­netic mo­ment and elec­tric di­pole mo­ment sen­si­tive to new physics with high pre­ci­sion. This ex­per­i­ment uses a novel method using the low-emit­tance muon beam achieved by cool­ing and re-ac­cel­er­a­tion. In the muon linac con­sist­ing of four dif­fer­ent ac­cel­er­at­ing cav­i­ties, the main cause of the emit­tance growth is the beam mis­match be­tween the dif­fer­ent cav­i­ties. Es­pe­cially for the cav­ity in the low-beta sec­tion (ß=0.08-0.27), the lon­gi­tu­di­nal ac­cep­tance is nar­row and beam mis­match has a sig­nif­i­cant im­pact. In order to per­form beam match­ing in the low-beta cav­ity, a new beam mon­i­tor that can mea­sure the low-emit­tance muon beam with high time res­o­lu­tion is re­quired. There­fore, we de­vel­oped a bunch width mon­i­tor (BWM) using a mi­crochan­nel plate. The time res­o­lu­tion of the BWM was mea­sured to be 40 pi­cosec­onds on the test bench using a pi­cosec­ond pulse laser. It means that the BWM is pos­si­ble to per­form di­ag­no­sis with a phase ac­cu­racy of 1% for the ac­cel­er­a­tion phase of 324 MHz. We also eval­u­ated fac­tors that limit the cur­rent time res­o­lu­tion. In this pre­sen­ta­tion, the re­sults of an eval­u­a­tion of the BWM are re­ported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB325  
About • paper received ※ 19 May 2021       paper accepted ※ 08 June 2021       issue date ※ 10 August 2021  
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TUPAB174 Basic Design Study for Disk-Loaded Structure in Muon LINAC 1801
 
  • K. Sumi, T. Iijima, K. Inami, Y. Sue, M. Yotsuzuka
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • H. Ego, T. Mibe, M. Yoshida
    KEK, Ibaraki, Japan
  • T. Iijima
    KMI, Nagoya, AIchi Prefecture, Japan
  • Y. Kondo
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Nakazawa
    Ibaraki University, Hitachi, Ibaraki, Japan
  • M. Otani, N. Saito
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • Y. Takeuchi
    Kyushu University, Fukuoka, Japan
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
  
  The world’s first disk-loaded struc­ture (DLS) at the high-ve­loc­ity part of a muon LINAC is under de­vel­op­ment for the J-PARC muon g-2/EDM ex­per­i­ment. We have sim­u­lated the first de­signed con­stant im­ped­ance DLS to ac­cel­er­ate muons from ß = 0.7 to 0.94 at an op­er­at­ing fre­quency of 1296 MHz and a phase of -10 de­grees to en­sure lon­gi­tu­di­nal ac­cep­tance and have shown the qual­ity of the beam meets our re­quire­ments. Be­cause the struc­ture needs a high RF power of 80 MW to gen­er­ate a gra­di­ent of 20 MV/m, a con­stant gra­di­ent DLS with the higher ac­cel­er­a­tion ef­fi­ciency is being stud­ied for lower op­er­at­ing RF power. In this poster, we will show the cell struc­ture de­sign yield­ing a gra­di­ent of 20 MV/m with lower RF power.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB174  
About • paper received ※ 19 May 2021       paper accepted ※ 31 August 2021       issue date ※ 18 August 2021  
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WEXB06 Development of an APF IH-DTL in the J-PARC Muon g-2/EDM Experiment 2544
 
  • Y. Nakazawa, H. Iinuma
    Ibaraki University, Hitachi, Ibaraki, Japan
  • E. Cicek, N. Kawamura, T. Mibe, M. Yoshida
    KEK, Ibaraki, Japan
  • N. Hayashizaki
    RLNR, Tokyo, Japan
  • Y. Iwata
    NIRS, Chiba-shi, Japan
  • R. Kitamura, Y. Kondo, T. Morishita
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • M. Otani, N. Saito
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • Y. Sue, K. Sumi, M. Yotsuzuka
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • Y. Takeuchi
    Kyushu University, Fukuoka, Japan
  • T. Yamazaki
    KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
  
  An in­ter-dig­i­tal H-mode drift-tube linac (IH-DTL) is under de­vel­op­ment in a muon linac at the J-PARC muon g-2/EDM ex­per­i­ment. It ac­cel­er­ates muons from 0.34 MeV to 4.3 MeV at an op­er­at­ing fre­quency of 324 MHz. The cav­ity can be minia­tur­ized by in­tro­duc­ing the al­ter­na­tive phase fo­cus­ing (APF) method that en­ables trans­verse fo­cus­ing only with an E-field. The APF IH-DTL cav­ity was mod­eled by a three-di­men­sional field analy­sis, and the beam dy­nam­ics were eval­u­ated nu­mer­i­cally. The beam emit­tance was cal­cu­lated as 0.316pi and 0.189pi mm mrad in the hor­i­zon­tal and ver­ti­cal di­rec­tions, re­spec­tively. It sat­is­fies the ex­per­i­men­tal re­quire­ment. Ac­tu­ally, the field error due to the fab­ri­ca­tion er­rors and ther­mal ex­pan­sion dur­ing op­er­a­tion causes an emit­tance growth. It was eval­u­ated that the op­ti­mized tuners can sup­press the emit­tance growth to less than 10%. In this paper, the de­tailed de­sign of the APF IH-DTL in­clud­ing the tuner will be re­ported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEXB06  
About • paper received ※ 19 May 2021       paper accepted ※ 29 July 2021       issue date ※ 20 August 2021  
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MOPAB195 Development of a Disk-and-Washer Cavity for the J-PARC Muon g-2/EDM Experiment 658
 
  • Y. Takeuchi, J. Tojo
    Kyushu University, Fukuoka, Japan
  • E. Cicek, K. Futatsukawa, N. Kawamura, T. Mibe, M. Otani, T. Yamazaki, M. Yoshida
    KEK, Ibaraki, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • R. Kitamura, Y. Kondo, T. Morishita
    JAEA/J-PARC, Tokai-mura, Japan
  • Y. Nakazawa
    Ibaraki University, Hitachi, Ibaraki, Japan
  • N. Saito
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • Y. Sue, K. Sumi, M. Yotsuzuka
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
  
  At J-PARC, an ex­per­i­ment using muons ac­cel­er­ated by a linac is planned to mea­sure the anom­alous mag­netic mo­ment of muons and to search for the elec­tric di­pole mo­ment. A 1296 MHz disk and washer (DAW) cou­pled cav­ity linac (CCL) is being de­vel­oped for use in the mid­dle beta sec­tion of the muon linac. The DAW CCL con­sists of 14 tanks with 11 cells each. All tanks are con­nected by bridge cou­plers and elec­tro­mag­netic quadru­pole dou­blets for fo­cus­ing are in­stalled in each bridge cou­pler. The basic de­sign of the DAW cav­ity has al­ready been com­pleted, and now de­tailed cav­ity de­sign stud­ies and man­u­fac­tur­ing process stud­ies are un­der­way. In this poster, we will re­port about these stud­ies and the prepa­ra­tion sta­tus of man­u­fac­tur­ing the DAW cav­ity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB195  
About • paper received ※ 20 May 2021       paper accepted ※ 01 June 2021       issue date ※ 23 August 2021  
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THXC05 Simulation of Imaging Using Accelerated Muon Beams 3740
 
  • M. Otani
    KEK, Tokai, Ibaraki, Japan
  • H.M. Miyadera
    LANL, Los Alamos, New Mexico, USA
  • T. Shiba
    Japan Atomic Energy Agency, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  
  Muons are el­e­men­tary par­ti­cles with strong pen­e­trat­ing power and cos­mic-ray muons have been uti­lized to see through large struc­tures such as the pyra­mids. Re­cently, we have suc­ceeded in ac­cel­er­at­ing muons using a ra­dio-fre­quency ac­cel­er­a­tor, open­ing the door to new imag­ing tech­niques using ac­cel­er­ated muon beams. Cur­rently, imag­ing with cos­mic-ray muons is lim­ited in imag­ing time and res­o­lu­tion by their in­ten­sity and en­ergy fluc­tu­a­tions. The muon beams can have high in­ten­sity and mono­chro­matic en­ergy, al­low­ing for bet­ter res­o­lu­tion imag­ing in less time. In this poster, imag­ing of spent nu­clear fuel in casks using cos­mic rays and muon beams, as well as imag­ing in other cases, will be eval­u­ated and com­pared.  
poster icon Poster THXC05 [2.560 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXC05  
About • paper received ※ 16 May 2021       paper accepted ※ 19 July 2021       issue date ※ 15 August 2021  
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