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Kamiya, Junichiro; Kinsho, Michikazu; Noshiroya, Shiyoji; Yamamoto, Kazami
Proceedings of 5th International Particle Accelerator Conference (IPAC '14) (Internet), p.2338 - 2340, 2014/07
In high power beam accelerators, pressure of the beam line directly affects the amount of the beam loss. J-PARC RCS is one of the most high power beam accelerators in the world. It aims the 1MW beam power, which corresponds to the average and peak beam current of 333 
A and about 10 A, respectively. In the present stage, the injection line called L3BT line (Linac to 3GeV Beam Transport line), is the section, where the pressure notably produces the beam loss. In this section, H
beam from Linac was converted to H
beam by charge stripping due to the interaction between H beam and the residual gas molecules. Such H beam was not bended by the injection septum magnets and directly hit the vacuum wall. We decided to add the vacuum pumps in this section to reduce the residual gas molecules in the beam line. In this paper, we will present the effectivity of the additional pumps by showing the relation between the beam line pressure and beam loss.
Noshiroya, Shiyoji
no journal, ,
In order to increase the beam intensity J-PARC 3GeV synchrotron at (RCS), it is necessary to uniform as much as possible the distribution of vacuum pressure, to further improve the vacuum. Since the beam loss is low where you have increased TMP temporary beam line to the RCS (L3BT) from the entrance portion to fiscal 2012, was expanded to two TMP exhaust system to the beam line in fiscal 2013. As a result beam loss has been reduced by 40% or more. RF1 section was added a new two as the same fiscal 2014. I have developed a mechanism that can be baked in a vacuum also kicker magnet further. I will introduce an overview.
Kamiya, Junichiro; Noshiroya, Shiyoji; Namekawa, Yuya; Hikichi, Yusuke; Sato, Atsushi; Kinsho, Michikazu; Yanagibashi, Toru*
no journal, ,
The 3 GeV synchrotron (Rapid Cycling Synchrotron: RCS) in J-PARC facility is one of the highest proton beam power accelerators, aiming 1 MW beam power. The RCS was completed in 2007. Since then, the vacuum system of the RCS has been stably operated through the steady/non-steady maintenances and the additional upgrades. This report aims to introduce the upgrade in the RCS vacuum system and the vacuum status of the beam line during the accelerator operation period.
