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The goal of tokamak à configuration variable (TCV) is to investigate effects of plasma shape, in particular high elongation (up to 3), on tokamak physics. Such elongated configurations (I(p) approximately equal to 1 MA) are highly vertically unstable with growth rates up to gamma = 4000/s. Control of the vertical position using the poloidal coils located outside the vessel is limited to gamma less than or equal to 1000/s because of the shielding effect of the conductive vessel and because of the relative slow time response of their power supplies (0.8 ms thyristor 12 pulse switching at 120 Hz). This dictated the necessity to install a coil set inside the vacuum vessel fed with a fast power supply (FPS). The choice and design of the system with a special attention to the mechanical and electrical constraints in TCV tokamak, as the results and real performances, are presented.

Additional information

Authors: FAVRE A ET AL, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);ELKJAER A, Danfysik A/S, Jyllinge (DK)
Bibliographic Reference: Article: Fusion Technology 1996, Elsevier Science BV (1997), pp. 1107-1110
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