Experimental evidence of reduced plasma flow damping with quasisymmetry

Measurements of plasma flow damping have been made in the helically symmetric experiment using a biased electrode to impulsively spin the plasma. There are two time scales in the evolution of the plasma flow, for both the spin-up and relaxation. Compared to a configuration with the quasisymmetry bro...

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Bibliographic Details
Published in:Physical review letters 2005-01, Vol.94 (1), p.015002.1-015002.4, Article 015002
Main Authors: GERHARDT, S. P, TALMADGE, J. N, CANIK, J. M, ANDERSON, D. T
Format: Article
Language:English
Subjects:
Exact sciences and technology
Magnetic confinement and equilibrium
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma dynamics and flow
Plasma flow
magnetohydrodynamics
Stellarators, spheromaks, compact tori, bumpy tori, and other toroidal confinement devices
Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices
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Summary:Measurements of plasma flow damping have been made in the helically symmetric experiment using a biased electrode to impulsively spin the plasma. There are two time scales in the evolution of the plasma flow, for both the spin-up and relaxation. Compared to a configuration with the quasisymmetry broken, the flow in the quasisymmetric configuration rises more slowly and to a higher value at bias turn-on, and decays more slowly at bias turn-off. The decays of the flows are significantly faster than the neoclassical prediction.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.015002