Open AccessComparison of ion source plasma responses to extraction grid bias between hydrogen and deuterium operations in NIFS-RNIS
Author(s) -
H. Nakano,
S. Masaki,
E. Rattanawongnara,
K. Tsumori,
K. Ikeda,
Taiga Hamajima,
K. Nagaoka,
M. Osakabe
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2244/1/012046
Subject(s) - deuterium , plasma , ion , hydrogen , atomic physics , chemistry , isotope , physics , nuclear physics , organic chemistry
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.