Reduced ﬁeld Scenario with X3 heating in W7-X
Max Planck Institute of Plasma Physics, EURATOM Association, Wendelsteinstr. 1 Greifswald DE17491 Germany
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Published online: 25 March 2019
In the present work, an ECRH scenario with reduced magnetic ﬁeld 1.75 T is considered. For 140 GHz, this ﬁeld corresponds to X3 heating. The high mirror-ratio magnetic conﬁguration, B01/B00 ≃ 0.24, was considered as one from most attractive for long-pulse operation with low bootstrap current. Since X3 wave mode can be eﬀectively absorbed only in suﬃciently hot plasmas, a preheating stage is necessary, and the requirements for target plasmas suitable for starting X3 have been studied. Diﬀerent ways to establish target plasmas are also discussed, in particular, augmenting X3 heating with X2 beams at 105 GHz.
© The Authors, published by EDP Sciences, 2019
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