October 2011

Conference Paper

Surface Plasma Source Electrode Activation by Surface Impurities

By:
Dudnikov, Vadim; Han, Baoxi ; Johnson, Rolland; Murray Jr, Sydney N; Pennisi, Terry R; Santana, Manuel ; Stockli, Martin P; Welton, Robert F
Page Number:
411-421
Volume:
1390
Book Title:
SECOND INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES
Publication Date:
October 6, 2011
Publisher Location:
American Institute of Physics, Melville, New York, United States of America
Conference Name:
2nd International Symposium on Negative Ions, Beams and Sources
Conference Location:
Takayama, Japan
Conference Sponsor:
National Insitute for Fusion Science

Abstract

In experiments with RF saddle antenna surface plasma sources (SPS) , the efficiency of H- ion generation was increased by up to a factor of 5 by long time plasma electrode “activation”, without adding Cs from Cs supply, by heating the collar to high temperature using hot air flow and plasma discharge. Without cracking or heating the cesium ampoule, but likely with Cs recovery from impurities, the achieved energy efficiency was comparable to that of conventionally cesiated SNS RF sources with an external or internal Cs supply. In the experiments, perfect cesiation was produced (without additional Cs supply) by the collection and trapping of traces of remnant cesium compounds from SPS surfaces.

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