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[en] The purpose of this study is to use helical device as an electron source. For this purpose, it is necessary to extract runaway electrons from the outside of the magnetic surface to the out of a helical device. To extract runaway electrons, the coils other than the helical and the vertical coils are required. It was clarified that extraction of runaway electrons is possible without influence on the magnetic surface when these additional coils are set up all around the device. In this paper, we researched the influence of the extraction coils on the magnetic field when those coils are set up partly. And, to make an electron source which can supply up to 10 keV electrons, we researched the extraction of 10 keV electrons which has maximum drift velocity. 10 keV electrons can be used for sterilization etc. (author)
Source
Nishimura, K.; Inagaki, S.; Sanuki, H.; Yamazaki, K. (National Inst. for Fusion Science, Toki, Gifu (Japan)) (eds.); 650 p; ISBN 4-9900586-7-4; 
; 2003; p. 630-633; ITC-12: 12. international Toki conference on plasma physics and controlled nuclear fusion; Toki, Gifu (Japan); 11-14 Dec 2001; APFA'01: 3. general scientific assembly of Asia plasma and fusion association; Toki, Gifu (Japan); 11-14 Dec 2001; 8 refs., 5 figs., 4 tabs.
; 2003; p. 630-633; ITC-12: 12. international Toki conference on plasma physics and controlled nuclear fusion; Toki, Gifu (Japan); 11-14 Dec 2001; APFA'01: 3. general scientific assembly of Asia plasma and fusion association; Toki, Gifu (Japan); 11-14 Dec 2001; 8 refs., 5 figs., 4 tabs.