SECOND WORKSHOP ON WENDELSTEIN VII-X SCHLOSS RINGBERG, BAVARIA, 13-16 JUNE, 1988
The aim of this second workshop on Wendelstein VII-X was to select one of the various options of the magnetic field configurations which are of interest for the future Garching large stellarator experiment Wendelstein VII-X. A Helias configuration was chosen as the favourite candidate for Wendelstein VII-X at the first workshop on Wendelstein VII-X which was held from 18 to 20 March 1987. During 1987 and 1988 further progress has been made in the development of the Helias concept, concerning its physical properties and associated engineering studies: item - investigation of plasma equilibrium, MHD- stability, neoclassical transport, bootstrap current, accessible parameter range, edge structure of the magnetic topology; item - coil optimization, magnetic force and stress analysis, support scheme, cryostat, general lay-out of the system.par The influence of the number of field periods has been established, and the feasibility of superconducting modular coils has been investigated, demonstrating that the magnetic forces and stresses are within the technical limits. The objective of the second workshop on Wendelstein VII-X therefore was item - to select the optimum Helias configuration with respect to MHD-stability and neo-classical transport, item - to discuss and decide about the geometric and magnetic dimensions of the Wendelstein VII-X experiment, item - to discuss the various heating scenarios applicable to Wendelstein VII-X, i.e. neutral beam injection, ion cyclotron heating, electron cyclotron heating, item - to discuss transport mechanisms and bootstrap current, and to estimate possible mechanisms for anomalous transport, item - to discuss various problems of impurity release and impurity diffusion, giving particular attention to options of impurity control, item - to present conceptual solutions to the mechanical problems of superconducting coils, item - to make a choice between normal conducting and superconducting coils.par During the four days of the workshop progress has been made towards the specification of the final concept of Wendelstein VII-X. Another result of the workshop concerns the question of normal conducting "it versus/" superconducting coils. After discussion of many arguments for and against each option there is a strong tendency in favour of a superconducting version of Wendelstein VII-X.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP 2/295, 1988
Record Number: 1989126105300 / Last updated on: 1989-06-01
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