IPAC2012 - List of Authors (Satou, K.)

Paper	Title	Page
MOPPR028	Upgrade Plan of BLM System of J-PARC MR	837
	K. Satou, T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	The upgrade plan of BLM system of J-PARC Main Ring synchrotron (MR) will be described. Existing proportional chamber beam loss monitors (P-BLMs) have fast signal rise time of about 100ns and high gas gain of about 2·10⁴ at the maximum. These abilities were quite advantageous for the early beam commissioning stage. On the other hand, the gas gain is degraded with increasing output current. The P-BLM is suitable for a measurement of a low level beam loss event, however, vulnerable to a measurement of an accidental beam loss event (fast loss) causing high radiation. To enhance the dynamic range of the system, 1m long Air Ionization Chambers (AICs) will be installed and operated with the P-BLM. Experiments using the real beam loss at collimator area and at the Co60 radiation facility have demonstrated the stable operations up to the radiation level activated by the maximum beam loss power of the collimator area. A new data taking system is now under development, and its performances will also be presented.

THPPP080	Beam Halo Reduction in the J-PARC 3-GeV RCS	3918
	H. Hotchi, H. Harada, P.K. Saha, Y. Shobuda, F. Tamura, K. Yamamoto, M. Yamamoto, M. Yoshimoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Irie, T. Koseki, Y. Sato, M.J. Shirakata KEK, Ibaraki, Japan K. Satou J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	The J-PARC RCS (3-GeV rapid cycling synchrotron) has two functions as a proton driver to the MLF (Materials and life science facility) and an injector to the MR (50-GeV main ring synchrotron). One of important issues in the current RCS bam tuning is to suppress the beam halo formation, which is essential especially to reduce the beam loss at the MR. In this paper, we present beam study results on the formation mechanism and reduction of the beam halo in the RCS.

Paper

Title

Page

Upgrade Plan of BLM System of J-PARC MR

837

K. Satou, T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

The upgrade plan of BLM system of J-PARC Main Ring synchrotron (MR) will be described. Existing proportional chamber beam loss monitors (P-BLMs) have fast signal rise time of about 100ns and high gas gain of about 2·10⁴ at the maximum. These abilities were quite advantageous for the early beam commissioning stage. On the other hand, the gas gain is degraded with increasing output current. The P-BLM is suitable for a measurement of a low level beam loss event, however, vulnerable to a measurement of an accidental beam loss event (fast loss) causing high radiation. To enhance the dynamic range of the system, 1m long Air Ionization Chambers (AICs) will be installed and operated with the P-BLM. Experiments using the real beam loss at collimator area and at the Co60 radiation facility have demonstrated the stable operations up to the radiation level activated by the maximum beam loss power of the collimator area. A new data taking system is now under development, and its performances will also be presented.

THPPP080

Beam Halo Reduction in the J-PARC 3-GeV RCS

3918

H. Hotchi, H. Harada, P.K. Saha, Y. Shobuda, F. Tamura, K. Yamamoto, M. Yamamoto, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
Y. Irie, T. Koseki, Y. Sato, M.J. Shirakata
KEK, Ibaraki, Japan
K. Satou
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

The J-PARC RCS (3-GeV rapid cycling synchrotron) has two functions as a proton driver to the MLF (Materials and life science facility) and an injector to the MR (50-GeV main ring synchrotron). One of important issues in the current RCS bam tuning is to suppress the beam halo formation, which is essential especially to reduce the beam loss at the MR. In this paper, we present beam study results on the formation mechanism and reduction of the beam halo in the RCS.