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Controlling the Transport of Canonical Helicity to Improve Confinement in a Compact Torus

Author: Setthivoine You
Requested Type: Consider for Invited
Submitted: 2014-05-30 16:33:52

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Contact Info:
University of Washington
3795 E Stevens Way NE
Seattle, WA   98195
USA

Abstract Text:
The L-H transition in tokamak plasma confinement is not fully understood but appears to be related to reductions in turbulent fluctuations by shear, zonal, flows near the plasma edge. The transition is triggered by plasma heating exceeding a given threshold. From a canonical helicity point-of-view, the transition from magnetic fluctuations to flowing modes in a magnetofluid could be due to sufficient enthalpy applied at the appropriate scale length. This boundary condition forces a transfer of magnetic helicity into flow helicity while conserving the total canonical helicity. Because this transport mechanism is fundamental, it should also apply to simply connected magnetic configurations. Knowing how to apply sufficient enthalpy at the appropriate scale length could then lead to improved confinement in spheromaks or field-reversed configurations. A new experiment at the University of Washington (MOCHI LabJet) is being built to test the idea of applying enthalpy at various scale lengths, to test the theory of canonical helicity injection and observe transitions between magnetic instabilities and flow vorticities.

Characterization: 1.1,4.0

Comments:

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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