Free-Boundary Plasma Equilibrium Computation in Spherical Globus-M2 Tokamak by Means of the pyGSS Code

• Published in: Plasma physics reports 2023-12, Vol.49 (12), p.1560-1577
• Main Authors: Kiselev, E. O., Balachenkov, I. M., Bakharev, N. N., Varfolomeev, V. I., Gusev, V. K., Zhiltsov, N. S., Zenkova, O. A., Kavin, A. A., Kurskiev, G. S., Minaev, V. B., Miroshnikov, I. V., Patrov, M. I., Petrov, Yu. V., Sakharov, N. V., Skrekel, O. M., Solokha, V. V., Telnova, A. Yu, Tkachenko, E. E., Tokarev, V. A., Tukhmeneva, E. A., Khromov, N. A., Shchegolev, P. B.
• Format: Article
• Language: English
• Subjects: Atomic; Closed loops; Computation; Diamagnetism; Magnetic flux; Molecular; Optical and Plasma Physics; Parameters; Physics; Physics and Astronomy; Plasma currents; Plasma equilibrium; Position measurement; Spatial distribution; Spherical plasmas; Thermal plasmas; Tokamak devices; Tokamaks
• ISSN: 1063-780X; 1562-6938
• DOI: 10.1134/S1063780X23601657

The pyGSS code constructed for computation of free-boundary plasma equilibrium in spherical Globus-M2 tokamak is described. Currents in the coils of the electromagnetic system, their coordinates, plasma current, positions of the limiter and current-conducting wall, etc., are used as the input parameters. Free parameters determining spatial distribution of equilibrium pressure and current density are selected in the course of code execution in such a way that the results of reconstruction would agree with the experimental measurements of the poloidal magnetic flux by means of toroidally closed loops. The results of computation of equilibrium are compared with those obtained by means of other codes and experimentally measured thermal plasma energy, position of the separatrix outer leg, the diamagnetic-loop signal, etc.