Abstract
A simple method is proposed to determine the equilibrium quantities (such as the plasma position and Shafranov's parameter Lambda ) in Tokamaks and RFPs. This method is available in the transient phase of a discharge, in which the plasma equilibrium is maintained by time-varying vertical fields, e.g. in the case where the plasma is surrounded by a thin shell. In this method, the external fields measured are matched to the approximate solution of the Grad-Shafranov equation in a vacuum by a fitting procedure. In the case of a circular plasma boundary, only a small number (>or=6) of the field measurements can provide a stable and rapid determination of equilibrium. A successful application to the REPUTE-1 RFP plasma with thin shell reveals that in most cases the plasma starts to move outward and downward before the plasma current begins to fall.
Original language | English (US) |
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Article number | 007 |
Pages (from-to) | 79-89 |
Number of pages | 11 |
Journal | Plasma Physics and Controlled Fusion |
Volume | 32 |
Issue number | 1 |
DOIs | |
State | Published - 1990 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Nuclear Energy and Engineering
- Condensed Matter Physics