Numerical study of plasma generation process and internal antenna heat loadings in J-PARC RF negative ion source

T Shibata; K Nishida; S Mochizuki; S Mattei; J Lettry; A Hatayama; A Ueno; H Oguri; K Ohkoshi; K Ikegami; A Takagi; H Asano; F Naito

doi:10.1063/1.4931787

Numerical study of plasma generation process and internal antenna heat loadings in J-PARC RF negative ion source

Rev Sci Instrum. 2016 Feb;87(2):02B128. doi: 10.1063/1.4931787.

Authors

T Shibata¹, K Nishida², S Mochizuki², S Mattei³, J Lettry³, A Hatayama², A Ueno¹, H Oguri¹, K Ohkoshi¹, K Ikegami¹, A Takagi¹, H Asano¹, F Naito¹

Affiliations

¹ J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
² Keio University, Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa-ken 223-8522, Japan.
³ European Organization for Nuclear Research (CERN), 1211 Geneva 23, Switzerland.

PMID: 26932010
DOI: 10.1063/1.4931787

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.