-
Author(s):
S. Murakami, N. Nakajima, S. Okamura and M. Okamoto
-
Title:
Orbital Aspects of Reachable beta Value in NBI Heated Heliotron/Torsatrons
Date of publication:
May 1995
-
Key words:
plasma beta, heliotron/ torsatron, neutral beam injection heating, beam orbit loss, heating efficiency, high beta experiments, the Compact Helical System
-
Abstract:
By modeling the typical orbital deviation and the deposition profile of tangentially injected neutral beams, the heating efficiency is derived in heliotron/ torsatrons. It is found that the changes of the configuration due to the finite beta effects alter the NBI heating efficiency largely and that the magnetic well or hill condition, which is important for the MHD stabilities, is also an important factor to determine the heating efficiency in a weak magnetic field. By combining the energy confinement scaling law the reachable beta value is evaluated and it is found that there is the optimum value of the magnetic field strength to obtain the high plasma beta in point of view of the NBI heating efficiency.
-
|
