ALPHA MHD - Theory Group

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1 ALPHA_MHD

ALPHA_MHD

Definition

The MHD pressure-gradient parameter

$\alpha_{\rm MHD} = -q^2 R_0 \frac{8\pi}{B_{\rm unit}^2} \frac{dp}{dr} .$

Comments

This is active only for simulations in circular geometry (RADIAL_PROFILE_METHOD=1).
This affects the curvature drift and perpendicular Laplacian according to

$s\theta \rightarrow s\theta - \alpha_{\rm MHD} \,\!$

When RADIAL_PROFILE_METHOD=3,5 (Miller geometry), the pressure gradient effect (which is complicated in general) is computed directly from $dp/dr\,\!$ in the Miller geometry subroutine.

Internal name

alpha_mhd0

Default

0.0

Retrieved from "http://fusion.gat.com/theory/ALPHA_MHD"

Category: Gyro input parameters