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Saha, P. K.

Paper Title Page
TUPAN061 Updated Simulation for the Nuclear Scattering Loss Estimation at the RCS Injection Area 1526
  • P. K. Saha, H. Hotchi, Y. Irie, F. Noda
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • S. Machida
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  We have updated the simulation for the realistic beam loss estimation at the RCS (Rapid Cycling Synchrotron) injection area of J-PARC(Japan Proton Accelerator Research Complex). At the injection area, beam loss caused by the nuclear scattering together with the multiple coulomb scattering at the charge-exchange foil is the dominant one and is an important issue for designing mainly the foil thickness and other beam elements like, the falling time of bump magnets after the injection is finished and so on. The simulation tool GEANT for the scattering effect and the real injection process have been employed together in order to estimate the beam loss turn by turn including identification of loss points too.  
FRPMN047 Development of a Beam Induced Heat-Flow Monitor for the Beam Dump of the J-PARC RCS 4084
  • K. Satou, N. Hayashi, H. Hotchi, Y. Irie, M. Kinsho, M. Kuramochi, P. K. Saha, Y. Yamazaki
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • S. Lee
    KEK, Ibaraki
  A beam induced heat-flow monitor (BIHM) will be installed in front of the beam dump of the RCS (Rapid Cycling Synchrotron) at J-PARC (Japan Particle Accelerator Research Complex), where a power limitation of the beam dump is 4 kW. The purposes of this monitor are to observe a beam current injected into the beam dump and to generate an alarm signal for the main control system of the RCS. At the BIHM the beams penetrate a carbon plate of 1.5 mm in thickness, where the plate is supported by four rods on the monitor chamber. The heat generated by the interactions between the beam and the carbon plate propagates to the outer edge of the plate, and then to the monitor chamber through the four rods. By measuring the temperature differences between upstream and downstream ends of each rod, the total heat flow can be measured. The beam current can be determined by the measured heat flow with the help of the calculated stopping power of a proton in a carbon material. The design of the BIHM and test results of a prototype will be described.