Confinement physics study in a small low aspect ratio helical device: CHS

Okamura, S; Matsuoka, K; Akiyama, R; Darrow, DS; Ejiri, A; Fujisawa, A; Fujiwara, M; Goto, M; Ida, K; Idei, H; Iguchi, H; Inoue, N; Isobe, M; Itoh, K; Kado, S; Khlopenkov, K; Kondo, T; Kubo, S; Lazaros, A; Lee, S; Matsunaga, G; Minami, T; Morita, S; Murakami, S; Nakajima, N; Nikai, N; Nishimura, S; Nomura, I; Ohdachi, S; Ohkuni, K; Osakabe, M; Pavlichenko, R; Peterson, BJ; Sakamoto, R; Sanuki, H; Sasao, M; Shimizu, A; Shirai, Y; Sudo, S; Takagi, S; Takahashi, C; Takayama, S; Takechi, M; Tanaka, K; Toi, K; Watari, T; Yamazaki, K; Yokoyama, M; Yoshimura, Y

dc.contributor.author	Okamura, S	en
dc.contributor.author	Matsuoka, K	en
dc.contributor.author	Akiyama, R	en
dc.contributor.author	Darrow, DS	en
dc.contributor.author	Ejiri, A	en
dc.contributor.author	Fujisawa, A	en
dc.contributor.author	Fujiwara, M	en
dc.contributor.author	Goto, M	en
dc.contributor.author	Ida, K	en
dc.contributor.author	Idei, H	en
dc.contributor.author	Iguchi, H	en
dc.contributor.author	Inoue, N	en
dc.contributor.author	Isobe, M	en
dc.contributor.author	Itoh, K	en
dc.contributor.author	Kado, S	en
dc.contributor.author	Khlopenkov, K	en
dc.contributor.author	Kondo, T	en
dc.contributor.author	Kubo, S	en
dc.contributor.author	Lazaros, A	en
dc.contributor.author	Lee, S	en
dc.contributor.author	Matsunaga, G	en
dc.contributor.author	Minami, T	en
dc.contributor.author	Morita, S	en
dc.contributor.author	Murakami, S	en
dc.contributor.author	Nakajima, N	en
dc.contributor.author	Nikai, N	en
dc.contributor.author	Nishimura, S	en
dc.contributor.author	Nomura, I	en
dc.contributor.author	Ohdachi, S	en
dc.contributor.author	Ohkuni, K	en
dc.contributor.author	Osakabe, M	en
dc.contributor.author	Pavlichenko, R	en
dc.contributor.author	Peterson, BJ	en
dc.contributor.author	Sakamoto, R	en
dc.contributor.author	Sanuki, H	en
dc.contributor.author	Sasao, M	en
dc.contributor.author	Shimizu, A	en
dc.contributor.author	Shirai, Y	en
dc.contributor.author	Sudo, S	en
dc.contributor.author	Takagi, S	en
dc.contributor.author	Takahashi, C	en
dc.contributor.author	Takayama, S	en
dc.contributor.author	Takechi, M	en
dc.contributor.author	Tanaka, K	en
dc.contributor.author	Toi, K	en
dc.contributor.author	Watari, T	en
dc.contributor.author	Yamazaki, K	en
dc.contributor.author	Yokoyama, M	en
dc.contributor.author	Yoshimura, Y	en
dc.date.accessioned	2014-03-01T01:48:51Z
dc.date.available	2014-03-01T01:48:51Z
dc.date.issued	1999	en
dc.identifier.issn	0029-5515	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25619
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.classification	Physics, Nuclear	en
dc.subject.other	NEUTRAL BEAM INJECTION	en
dc.subject.other	HELIOTRON TORSATRON	en
dc.subject.other	ELECTRIC-FIELD	en
dc.subject.other	STELLARATOR	en
dc.subject.other	SYSTEM	en
dc.subject.other	PROBE	en
dc.title	Confinement physics study in a small low aspect ratio helical device: CHS	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	Variation of the plasma position relative to the centre of the helical coil winding is a very effective means of controlling the MHD stability and the trapped particle confinement in heliotron/torsatron systems, but improving one of these two characteristics with this parameter simultaneously has a detrimental effect on the other. The inward shifted configuration is favourable for drift orbit optimization but is predicted to be unstable according to the Mercier criterion. Various physics problems, such as electric field structure, plasma rotation and MHD phenomena, have been studied in the Compact Helical System (CHS) with a compromise intermediate position. With this standard configuration, CHS has yielded experimental results that contribute to the understanding of general toroidal, confinement physics and low aspect ratio helical systems. In the recent experiments; it was found that a wide range of inward shifted configurations give stable plasma discharges without any restriction to the special pressure profile. Such an enhanced range of operation made it possible to study experimentally the drift orbit optimized configuration in heliotron/torsatron systems. The effect of configuration improvement was studied with plasmas in a low collisionality regime.	en
heal.publisher	INT ATOMIC ENERGY AGENCY	en
heal.journalName	NUCLEAR FUSION	en
dc.identifier.isi	ISI:000083096200011	en
dc.identifier.volume	39	en
dc.identifier.issue	9Y	en
dc.identifier.spage	1337	en
dc.identifier.epage	1350	en