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Hayashi, N.

Paper Title Page
WGF03 Beam Loss Monitoring Using Proportional Counters at J-PARC 450
 
  • T. Toyama, A. Akiyama, Y. Hashimoto, S. Lee, H. Nakagawa, J.-I. Odagiri, T. Suzuki, M. Tejima, N. Yamamoto
    KEK, Ibaraki
  • N. Hayashi, K. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • K. Satou
    J-PARC, KEK&JAEA, Ibaraki-ken
 
 

Proportional counter is adopted as a main beam loss monitor system for the RCS and MR of J-PARC. The advantages are signal amplification and radiation hardness. In our case the signal amplification more than 500 and the radiation hardness of not only component materials but also its sensitivity which keeps constant upto the charge accumulation of 0.0035 C/mm by Co-60 γ-ray source irradiation, corresponds more than several years operation. The rise time is an order of μs which satisfies the requirement of MPS (Machine Protection System). The system will be overviewed and the performance with radiation sources and beams will be reported comparing with the MARS simulation.

 
WGF11 Beam Diagnostic System of the Main Ring Synchrotron of J-PARC 472
 
  • K. Satou
    J-PARC, KEK&JAEA, Ibaraki-ken
  • D.A. Arakawa, A. Arinaga, Y. Hashimoto, S. Igarashi, M. Tejima
    KEK, Ibaraki
  • N. Hayashi, K. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • T. Toyama
    J-PARC, KEK & JAEA, Ibaraki-ken
 
 

The beam commissioning of the J-PARC Main Ring synchrotron (MR) has been started from May of this year. A single bunch beam from 3 GeV Rapid Cycling Synchrotron (RCS) was injected to the ring through 3-50 beam transporting (3-50BT) and then was extracted to the beam dump after 1000 turns (typically) without acceleration. The beam intensity was 4·1011 ppb that is 2 orders of magnitude smaller than that of the design intensity. The beam diagnostic system was used to establish the beam operational parameters. The system includes the instrumentations as follows; 3 types of Current Transformers (CTs), DCCT, fast CT (FCT), and Wall Current Monitor (WCM); Beam Position Monitors (BPMs); proportional counter type Beam Loss Monitors (BLMs) at each quadropole magnet; horizontal and vertical tune monitors with exciter systems; and 3 types of beam profile monitors, Multi Wire Profile Monitors (MWPMs) at 3-50BT and downstream of injection septa, a horizontal Flying Wire Profile Monitor (FWPM) and a vertical residual gas Ionization Profile Monitor (IPM) in the ring. At the workshop, the present status of the system will be presented.

 

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