CONFIGURATION STUDIES WITH RESPECT TO W-VII-X
Configurations with helical axis are studied with the aim to find modular coils instead of interlinked circular coils. For this purpose an analytic winding law describing twisted coils has been defined. Starting from a general helical and closed curve a reference plane put up either by two vectors e-Z and e-R or by the normal and binormal vector of the axis in defined from where on the warping of the coils is measured. Radius and amplitudes of the coils are represented in a Fourier series. A Heliac-type configuration with 5 periods and modular coils has been investigated. Optimization by proper positioning of the coils is possible, both in case I (equal space between coils, DELTA = constant), and in case II (variable space between coils). The configuration can be optimized with respect to: magnetic ripple and Pfirsch-Schlueter currents, particle orbits and neoclassical diffusion. Reducing the number of coils per field period enhances the modular ripple. With plane bean-shaped coils also helical magnetic surfaces can be produced, in order to obtain a magnetic well a large indentation is necessary. Extrapolation to reactor size has been done in case of the 5 period configuration. In order to find enough space for the blanket the major radius has be be R = 25 m.
Bibliographic Reference: 5TH INTERNATIONAL WORKSHOP ON STELLARATORS, SCHLOSS RINGBERG, BAVARIA (GERMANY), SEPT. 24-28, 1984 VOL. II, PP. 749-761, EUR 9618 EN (1985) FS, VOL. I AND VOL. II, 787 P., BFR 3500 (BOTH VOLUMES), EUROFFICE, LUXEMBOURG, POB 1003
Record Number: 1989124116100 / Last updated on: 1987-01-01
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