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Asano, H.

Paper Title Page
TUPAN043 RF Amplitude and Phase Tuning of J-PARC DTL 1481
 
  • M. Ikegami, Z. Igarashi, H. Tanaka
    KEK, Ibaraki
  • H. Asano, T. Kobayashi
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • K. Hasegawa, T. Ito, T. Morishita, S. Sato, A. Ueno
    JAEA/LINAC, Ibaraki-ken
  • H. Sako
    JAEA, Ibaraki-ken
 
  The beam commissioning of J-PARC linac has been started in November 2006. In the beam commissioning, the tuning of the RF phase and amplitude for its DTL (Drift Tube Linac) has been performed with a phase-scan method. Detailed results of the RF tuning are presented with a brief discription of the tuning procedure.  
TUPAN058 High Power Conditioning of the DTL for J-PARC 1517
 
  • T. Ito, H. Asano, T. Morishita
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • H. Ao
    JAEA/LINAC, Ibaraki-ken
  • T. Kato, F. Naito, E. Takasaki, H. Tanaka
    KEK, Ibaraki
 
  For the J-PARC, DTL (Drift Tube Linac) is used to accelerate an H- ion beam from 3MeV to 50MeV. The DTL consists of 3 tanks and the all tanks were installed in the accelerator tunnel for J-PARC. After the installation, the high power conditioning has been started in Oct. 2006. The required rf power levels for beam acceleration are about 1.08MW, 1.2MW and 1.03MW (the pulse length is 600μsec and the pulse repetition is 25Hz) for the 1st, 2nd and 3rd tanks, respectively. As a result of the conditioning, we have been achieved that the rf power levels are about 1.3MW, 1.45MW and 1.23MW of 1.2 times required power levels (the pulse length is 650μsec and the pulse repetition is 25Hz). In this paper, the results of the high power conditioning of the DTL tanks are described.  
TUPAN059 The Precise Survey and the Alignment Results of the J-PARC Linac 1520
 
  • T. Morishita, H. Asano, M. Ikegami
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • K. Hasegawa
    JAEA, Ibaraki-ken
  • A. Ueno
    JAEA/LINAC, Ibaraki-ken
 
  J-PARC linear accelerator components have been installed and the beam commissioning has been started in Nov. 2006. A total length is more than 400 m including the beam transport line to the 3GeV RCS(Rapid Cycling Synchrotron). Precise alignment of the accelerator components is essential for high quality beam acceleration. After the completion of the linac building, floor elevation was surveyed periodically for more than one year to adjust the beam height from the ion source to the RCS. Before the beam commissioning, a metrological survey has been done. The reference points on the tunnel wall were set up to form a survey network to reduce the survey error less than 1mm in the entire linac. Based on the survey results, the linac components were re-aligned finely to satisfy the requirement. In this paper, the results of the floor elevation and the final alignment are described.  
TUPAN060 The DTL/SDTL Alignment of the J-PARC Linac 1523
 
  • T. Morishita, H. Asano, M. Ikegami, T. Ito
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • K. Hasegawa
    JAEA, Ibaraki-ken
  • F. Naito, E. Takasaki, H. Tanaka, K. Yoshino
    KEK, Ibaraki
  • A. Ueno
    JAEA/LINAC, Ibaraki-ken
 
  J-PARC linear accelerator components have been installed and the beam commissioning has been started in Nov. 2006. The length of the linear section is about 300 m which consists of the ion source, the radio frequency quadropole linac(RFQ), the drift tube linac(DTL), separated type DTL(SDTL), and the beam transport line. Precise alignment of the accelerator components is essential for high quality beam acceleration. The required alignment error in the J-PARC linac is 0.1mm in transverse direction. In the DTL/SDTL section, the fine alignment was carried out by using an optical alignment telescope along with the cavity installation. The relay targets were placed at short intervals for smooth connection between neighboring components. After the installation, the DTL/SDTL positions were confirmed by measuring the reference base by using a laser tracker. In this paper, the alignment procedure for the DTL/SDTL section and the results by the laser tracker measurements are described.