IPAC2014 - List of Authors (Noshiroya, S.)

Paper	Title	Page
WEPME035	Beam Loss Suppression by Improvement of Vacuum System in J-PARC RCS	2338
	J. Kamiya, M. Kinsho, S. Noshiroya, K. Yamamoto JAEA/J-PARC, Tokai-mura, Japan
	In high power beam accelerators, pressure of the beam line directly affects the amount of the beam loss. For example, in the early 1970’s in CERN’s Intersecting Storage Ring (ISR), the ion-induced pressure bump produced the fall-off of the beam current. 3GeV synchrotron (RCS) in J-PARC is no exception. RCS is one of the most high power beam accelerators in the world. It aims the 1 MW beam power, which corresponds to the average and peak beam current of 333 uA 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 line, H⁻ beam from Linac was converted to H⁰ by charge stripping due to the interaction between H⁻ beam and the residual gas molecules. Such H⁰ was not bended by the injection septum magnets and directly hit the vacuum wall. We decided to add the vacuum pumps in this line to reduce the residual gas molecules. We will present the effectivity of the additional pumps on the basis of the measured results of the pressure improvement and the beam loss suppression.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME035
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Paper

Title

Page

Beam Loss Suppression by Improvement of Vacuum System in J-PARC RCS

2338

J. Kamiya, M. Kinsho, S. Noshiroya, K. Yamamoto
JAEA/J-PARC, Tokai-mura, Japan

In high power beam accelerators, pressure of the beam line directly affects the amount of the beam loss. For example, in the early 1970’s in CERN’s Intersecting Storage Ring (ISR), the ion-induced pressure bump produced the fall-off of the beam current. 3GeV synchrotron (RCS) in J-PARC is no exception. RCS is one of the most high power beam accelerators in the world. It aims the 1 MW beam power, which corresponds to the average and peak beam current of 333 uA 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 line, H⁻ beam from Linac was converted to H⁰ by charge stripping due to the interaction between H⁻ beam and the residual gas molecules. Such H⁰ was not bended by the injection septum magnets and directly hit the vacuum wall. We decided to add the vacuum pumps in this line to reduce the residual gas molecules. We will present the effectivity of the additional pumps on the basis of the measured results of the pressure improvement and the beam loss suppression.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME035

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)