The sources of Fe impurity in Heliotron E plasma during NBI

The sources of iron impurity in the Heliotron E plasma during NBI are investigated. When n e is smaller than 1×10 19 m -3 , the main mechanism of iron impurity production is sputtering of the beam dump by a high energy oxygen beam which is included in the neutral beam. The iron impurity is reduced b...

Full description

Saved in:
Bibliographic Details
Published in:Japanese Journal of Applied Physics 1988-06, Vol.27 (6), p.1017-1021
Main Authors: NISHINO, N, KONDO, K, MOTOJIMA, O, OBIKI, T, IIYOSHI, A, UO, K, ZUSHI, H, KANEKO, H, MIZUUCHI, T, BESSHOU, S, SATO, M, MUTOH, T, SANO, F, SUDO, S
Format: Article
Language:English
Subjects:
Exact sciences and technology
Magnetic confinement and equilibrium
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The sources of iron impurity in the Heliotron E plasma during NBI are investigated. When n e is smaller than 1×10 19 m -3 , the main mechanism of iron impurity production is sputtering of the beam dump by a high energy oxygen beam which is included in the neutral beam. The iron impurity is reduced by half after Ti-gettering at the ion source of the NB injector. When n e is larger than 3×10 19 m -3 , the main impurity source is the plasma-wall interaction, and this impurity is not reduced by the Ti-gettering.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.27.1017