A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Kato, T.

Paper Title Page
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.  
THICKI02 Design of Large-sized Accelerator Tunnel 2697
  • T. Kato
    Nikken Sekkei Ltd.
  • A. Tamura
    Nikken Sekkei Civil Ltd, Tokyo
  There are several key points in designing the underground tunnel where large-sized accelerator is installed. The following two points are very important. (1) Transformation of the tunnel should be minimal. (2) Level of integrity and durability of the tunnel structure should be high. In order to accomplish minimal transformation of the tunnel and stable operation of the accelerator, we recommend not to provide the expansion joints in the tunnel concrete. As the result of structural analysis which we performed on temperature change inside the tunnel without expansion joints, we confirmed that there was few incidence of harmful cracks and transformation.  
slides icon Slides