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Author(s):
M. Sasao, Y. Okabe, A. Fujisawa, H. Iguchi, J. Fujita, H. Yamaoka and M. Wada
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Title:
Development of Negative Heavy Ion Sources for Plasma Potential Measurement
Date of publication:
Oct. 1991
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Key words:
Au^- negative ion source, plasma potential, Heavy ion beam probe, energy spread, work function
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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.
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