Abstract
An electrostatic type of antenna has been tried on TEXTOR allowing a maximum of 340 kW to be coupled to the plasma during long pulses (0.5 s). Possibly due to mechanical problems, the voltage stand-off was found to be only half that of the regular fast wave antenna. The coupling capability itself, in terms of power coupled for a given maximum voltage on the antenna, is also a factor of two lower than that of the fast wave antenna. The coupling resistance does not show the (theoretically expected) characteristics of an ion Bernstein wave coupler; first theoretical investigations indicate that this antenna is mainly a fast wave launcher. The edge perturbations caused by this antenna are almost negligible while bulk density increase is observed, leading to the conclusion that the particle confinement time improves during the RF pulse.
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