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Author(s):
H. Sanuki, K. Itoh and S.-I. Itoh
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Title:
Effects of Nonclassical Ion Losses on Radial Electric Field in CHS Torsatron/Heliotron
Date of publication:
July 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 discussed to determine the radial electric field and loss cone boundary in torsatron/heliotron plasmas under the influence of nonclassical ion losses. Effects of the loss cone loss, charge exchange loss of fast ions with neutrals, and the bipolar part of anomalous loss are taken into account. Analysis is applied to the NBI heated plasma in the CHS device. Comparison is made between theoretical results and experimental observations. The increased ion particle losses 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, charge exchange loss and bulk heating is estimated by using the self-consistent electric field profile. The power loss of fast ions caused by the orbit loss or charge exchange process is by a facter of several tens to hundred greater than the reduction of the energy loss of bulk ions through the enhancement of radial electric field. Comparison with W7-A experiment is made, and the differences are discussed.
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