Effect of antenna phasing and wall conditioning on ICRH in TEXTOR
Four new low field side antennae grouped in pairs have been installed on TEXTOR. It is found that the interaction with the wall (density rise, impurity generation) is significantly reduced when operating each pair out of phase as opposed to in phase. This beneficial effect is obtained without any drop in plasma loading. Theory shows this property to be dependant on the geometrical configuration. A further improvement in the wall interaction is made possible by an appropriate choice of wall conditioning (wall carbonisation with liner at 400 C or, above all, boronisation). As a result record low values of P(rad)/P(total) are achieved during ICRH. The large reduction in wall interaction during ICRH allows routine long pulse (< 1s) ICRH operation at the maximum power level available (approximately 2.5 MW).
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 31 (1989) No. 6, pp. 921-939
Record Number: 199010792 / Last updated on: 1994-12-01
Original language: en
Available languages: en