Comparison of ion source plasma responses to extraction grid bias between hydrogen and deuterium operations in NIFS-RNIS. Issue 1 (1st April 2022)

• Record Type: Journal Article
• Authors: Nakano, H; Masaki, S; Rattanawongnara, E; Tsumori, K; Ikeda, K; Hamajima, T; Nagaoka, K; Osakabe, M
• Is Part Of: Journal of physics. Volume 2244:Issue 1(2022)
• Publication Date: 2022-04-01
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/2244/1/012046
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: An isotope effect of negative ion motion in plasma near a plasma grid (PG), which is a plasma-beam boundary grid, has been investigated in a negative hydrogen-ion source with the surface production process of the negative ion on the PG surface. Negative deuterium-ion (D - ) density was higher than negative hydrogen-ion (H - ) density in the condition without extraction-grid bias ( V egb ) and approached the H - density in the condition with V egb . Thus, the D - density responded stronger than the H - density to the V egb . The density of the negative hydrogen-ion isotopes and the density response to the V egb have been organized into respective identical trends by momenta of isotopes emitting from the PG. The Larmor motion can be a dominant mechanism of the negative ion transport from the PG to the plasma.