title: Numerical study of plasma generation process and internal antenna heat loadings in J-PARC RF negative ion source.
abstract: A numerical model of plasma transport and electromagnetic field in the J-PARC (Japan Proton Accelerator Research Complex) radio frequency ion source has been developed to understand the relation between antenna coil heat loadings and plasma production/transport processes. From the calculation, the local plasma density increase is observed in the region close to the antenna coil. Electrons are magnetized by the magnetic field line with absolute magnetic flux density 30-120 Gauss which leads to high local ionization rate. The results suggest that modification of magnetic configuration can be made to reduce plasma heat flux onto the antenna.
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shibata
authors.affiliation: Keio University, Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa-ken 223-8522, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nishida
authors.affiliation: Keio University, Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa-ken 223-8522, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Mochizuki
authors.affiliation: European Organization for Nuclear Research (CERN), 1211 Geneva 23, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Mattei
authors.affiliation: European Organization for Nuclear Research (CERN), 1211 Geneva 23, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Lettry
authors.affiliation: Keio University, Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa-ken 223-8522, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Hatayama
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Ueno
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Oguri
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ohkoshi
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ikegami
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Takagi
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Asano
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
authors.forename: F
authors.initials: F
authors.lastname: Naito