Fast Ion Loss and Radial Electric Field in High-Aspect-Ratio Stellarator

Kimitaka Itoh, Heiji Sanuki, Sanae I. Itoh

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Theoretical model is developed to determine the radial electric field and the fast ion loss simultaneously in stellarators, and is applied to the Wendelstein VII-A stellarator. The predicted value of the radial electric field is more closer to experiments than the purely neoclassical calculation. The loss rate, which is determined simultaneously, is in the range of experimental observations. The partition of the injection energy by the bulk heating, direct orbit loss and shine through is estimated by using the selfconsistent electric field profile. The orbit loss becomes noticeable as the injection energy increases. The influence of the neutral particles is also studied. Neutral particles enhance the negative radial electric field, and reduce the direct orbit loss by the expense of the charge exchange loss. The impact of the increased radial electric field on the neoclassical ion thermal energy loss is compared to the direct loss of fast ions. The reduction of the neoclassical loss is much smaller than the orbit loss.

Original languageEnglish
Pages (from-to)2294-2303
Number of pages10
Journaljournal of the physical society of japan
Volume61
Issue number7
DOIs
Publication statusPublished - Jun 1992

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stellarators
high aspect ratio
electric fields
ions
orbits
neutral particles
injection
thermal energy
charge exchange
partitions
energy dissipation
heating
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Fast Ion Loss and Radial Electric Field in High-Aspect-Ratio Stellarator. / Itoh, Kimitaka; Sanuki, Heiji; Itoh, Sanae I.

In: journal of the physical society of japan, Vol. 61, No. 7, 06.1992, p. 2294-2303.

Research output: Contribution to journalArticle

Itoh, Kimitaka ; Sanuki, Heiji ; Itoh, Sanae I. / Fast Ion Loss and Radial Electric Field in High-Aspect-Ratio Stellarator. In: journal of the physical society of japan. 1992 ; Vol. 61, No. 7. pp. 2294-2303.
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