Beam loss suppression by improvement of vacuum system in J-PARC RCS

Kamiya, Junichiro; Kinsho, Michikazu; Noshiroya, Shiyoji; Yamamoto, Kazami

Proceedings of 5th International Particle Accelerator Conference (IPAC '14) (Internet), p.2338 - 2340, 2014/07

http://accelconf.web.cern.ch/AccelConf/IPAC2014/papers/wepme035.pdf

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.

TIARA annual report 2002

Advanced Radiation Technology Center

JAERI-Review 2003-033, 390 Pages, 2003/11

JAERI-Review-2003-033-p0001-p0187.pdf:18.1MB
JAERI-Review-2003-033-p0188-p0390.pdf:15.87MB

This annual report describes research and development activities which have been performed with the JAERI TIARA (Takasaki Ion Accelerators for Advanced Radiation Application) facilities from April 1, 2002 to March 31, 2003. Summary reports of 113 papers and brief descriptions on the status of TIARA in the period are contained. A list of publications, the type of research collaborations and organization of TIARA are also given as appendices.

Proceedings of the Symposium on the Joint Research Project between JAERI and Universities; Status and Perspective of the Advanced Radiation Technology Project, January 27, 1999, National Education Center, Tokyo, Japan

Committee for the Joint Research Project on the Advanced Radiation Technology; Committee for the Collaborative Research on the Advanced Radiation Technology

JAERI-Conf 2000-008, 113 Pages, 2000/06

JAERI-Conf-2000-008.pdf:11.5MB

no abstracts in English

Accelerator application programs in JAERI

*

Proc. of 6th China-Japan Joint Symposium on Accelerators for Nuclear Science and Their Applications, 0, p.376 - 379, 1996/00

no abstracts in English

Present status and development of negative ion sources

Kasokuki Kagaku, 1(2), p.3 - 20, 1984/00

no abstracts in English

Measurement of Differential Thermal Neutron Spectra in Graphite Poisoned with Indium, Cadmium and Samarium by Time of Flight Method

Akino, Fujiyoshi; ; S.F.Hanna*; ;

JAERI-M 5399, 39 Pages, 1973/09

JAERI-M-5399.pdf:1.56MB

no abstracts in English

Present status of JAEA-Tokai tandem accelerator facility

Tayama, Hidekazu

no journal, , 

no abstracts in English