Reconstruction of equilibrium from experimental measurements in PBX-M
The reconstruction of plasma flux surface shapes, toroidal current density profile, and pressure profile are necessary for diagnosis of shaped cross-section tokamaks. In particular, the highly shaped PBX-M experiment is intended to examine the physics and feasibility of reaching the second stability regime. Parameters such as toroidal and poloidal beta, safety factor at the magnetic axis, and internal self-inductance are critical for determining progress toward this regime. Experimental measurements of the plasma current, poloidal magnetic flux, safety factor at the axis, and poloidal magnetic field inside the plasma along the midplane are fitted in a least-squares technique within the constraint of the Grad-Shafranov equation. The pressure and poloidal current profiles are represented by a finite set of functions of the poloidal magnetic flux. The coefficients weighting each function are determined by matching the experimental data.
Bibliographic Reference: Paper presented: 31st Annual Meeting of the Division of Plasma Physics, Anaheim, California (US), Nov. 13-17, 1989
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Record Number: 199010483 / Last updated on: 1994-12-01
Original language: en
Available languages: en