Magnetic field structure preferable to E×B shear flow generation in a quasi-axisymmetric stellarator CHS-qa
- 26 April 2002
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 44 (5A) , A225-A230
Abstract
Viscous damping and effective helical ripple have been quantitatively estimated for a proposed quasi-axisymmetric stellarator CHS-qa configuration. It is predicted that viscous damping against plasma flow in CHS-qa is low enough to sustain large E × B shear as observed in the H-modes and internal transport barriers in many tokamaks. Effective helical ripple in CHS-qa is adjusted to be on the order of 10-2 or lower, which is suitable to trigger transport barriers due to non-ambipolar neoclassical fluxes peculiar to conventional helical devices. For experimental flexibility, viscous damping and effective helical ripple in CHS-qa can be extensively controlled over a range of about one order by modifying modular coil currents.Keywords
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