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Title: Radial electric field and ion parallel flow in the quasi-symmetric and Mirror configurations of HSX

Journal Article · · Plasma Physics and Controlled Fusion
ORCiD logo [1];  [1];  [1];  [2];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States). HSX Plasma Lab. Dept. of Electrical and Computer Engineering
  2. Univ. of Wisconsin, Madison, WI (United States). HSX Plasma Lab. Dept. of Electrical and Computer Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this paper, the radial electric field and the ion mean parallel flow are obtained in the helically symmetric experiment stellarator from toroidal flow measurements of C+6 ion at two locations on a flux surface, using the Pfirsch–Schlüter effect. Results from the standard quasi-helically symmetric magnetic configuration are compared with those from the Mirror configuration where the quasi-symmetry is deliberately degraded using auxiliary coils. For similar injected power, the quasi-symmetric configuration is observed to have significantly lower flows while the experimental observations from the Mirror geometry are in better agreement with neoclassical calculations. Finally, indications are that the radial electric field near the core of the quasi-symmetric configuration may be governed by non-neoclassical processes.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
AC05-00OR22725; FG02-93ER54222
OSTI ID:
1432157
Journal Information:
Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 5 Vol. 60; ISSN 0741-3335
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Role of Neoclassical Transport and Radial Electric Field in LHD Plasmas journal August 2010
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