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Iterative optimization of auxiliary coils for stellarators

Authors :
J. H. Harris
B. McMillan
Boyd Blackwell
Source :
Nuclear Fusion. 42:383-387
Publication Year :
2002
Publisher :
IOP Publishing, 2002.

Abstract

A direct method is described for finding optimal coils, and `flexibility' coils are presented which have been determined by this method. The method proceeds straight to a coil design from the required vacuum magnetic configuration parameters for the desired plasma, rather than producing an intermediate `surface current' description. This allows engineering requirements to be faithfully reproduced. The method has been applied by implementing a perturbative vacuum rotational transform evaluator as an optimality criterion. The speed of this evaluation step allows a thorough exploration of the set of possible coil trajectories and permits a high degree of confidence in the optimality of the best candidate. It is shown that the flexible heliac winding is very near optimal for rotational transform generation.

Details

ISSN :
17414326 and 00295515
Volume :
42
Database :
OpenAIRE
Journal :
Nuclear Fusion
Accession number :
edsair.doi...........acc09b82978c7971b92c7ea398c0085d