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Author(s):
H. Sanuki, K. Itoh and S.-I. Itoh
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Title:
Selfconsistent Analysis of Radial Electric Field and Fast Ion Losses in CHS Torsatron / Heliotron
Date of publication:
Sep. 1992
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Key words:
radial electric field, CHS torsatron/heliotron, neoclassical, fast ion orbit loss, charge exchange loss, anomalous loss, energy partition
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Abstract:
A selfconsistent analysis is developed to determine the radial electric field and loss cone boundary in Torsatron/Heliotron plasmas under the influence of non-classical ion losses such as the loss cone loss and charge exchange loss of fast ions with neutrals. Analysis is applied to the NBI heated plasmas in the Compact Helical System (CHS) device. Comparison is made between theoretical results and experimental observations. The increased ion particle losses caused by the orbit loss and charge exchange loss with neutrals make the radial electric field more negative than the value of purely neoclassical calculation. The partition of the injection energy among the shine through, direct orbit loss, change exchange loss and bulk heating is evaluated by using the selfconsistent electric field profile. On-going experiments in the CHS device are briefly introduced.
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