DEPENDENCE OF ROTATIONAL TRANSFORM ON BETA IN CURRENTLESS STELLARATORS - COMPARISON OF STELLARATORS EXPANSION AND 3D-CODE RESULTS
The variation of the rotational transform profile (r/a), of the specific volume V'((r/a)**2), and of the radial axis displacement delta/a with beta is investigated in currentless stellarators by using a magnetic field line tracing code (for the vacuum configurations), an asymptotic code (based on the stellarator expansion in the small inverse aspect ratio 1/A, and the three dimensional BBG/BETA codes. In solving the finite beta equilibrium problem there is one main difference between the BBG/BETA code results, where the boundary value problem is solved for a boundary surface fixed for all beta values, and the asymptotic code, which solves a free boundary value problem. In the latter case the free plasma boundary is shifted radially outward without essential deformation of the boundary. This shift can be compensated by an adequate vertical field without changing the profile.
Bibliographic Reference: 5TH INTERNATIONAL WORKSHOP ON STELLARATORS, SCHLOSS RINGBERG, BAVARIA (GERMANY) SEPT. 24-28, 1984 VOL. I, PP. 401-416, EUR 9618 EN (1985) FS, VOL. I AND VOL. II, 787 P., BFR 3500 (BOTH VOLUMES), EUROFFICE, LUXEMBOURG, POB 1003
Record Number: 1989124118600 / Last updated on: 1987-01-01
Available languages: en