-
Author(s):
M. Sasao, Y. Okabe, A. Fujisawa, H. Iguchi, J. Fujita, H. Yamaoka and M. Wada
-
Title:
Development of Negative Heavy Ion Sources for Plasma Potential Measurement
Date of publication:
Oct. 1991
-
Key words:
Au^- negative ion source, plasma potential, Heavy ion beam probe, energy spread, work function
-
Abstract:
A plasma sputter negative ion source was studied for its applicability to the potential measurement of a fusion plasma. Both the beam current density and the beam energy spread are key issues. Energy spectra of a self extracted Au^- beam from the source were measured under the condition of a constant work function of the production surface. The FWHM increases from 3 eV to 9 eV monotonically as the target voltage increases from 50 V to 300 V, independently from the target surface work function of 2.2 - 3 eV.
-
|