Studies of ICRF Discharge Conditioning (ICRF-DC) on ASDEX Upgrade, JET and TEXTOR

The present paper reviews the recent results achieved in the ICRF-DC experiments performed in helium/hydrogen mixtures in the non-circular tokamaks ASDEX Upgrade and JET and first tests of the ICRF discharges in helium/oxygen mixtures in the circular tokamak TEXTOR. Special emphasis was given to stu...

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Veröffentlicht in:	AIP conference proceedings 2005-09, Vol.787 (1), p.445-448
Hauptverfasser:	Lyssoivan, A, Koch, R, Van Eester, D, Van Wassenhove, G, Vervier, M, Weynants, R, Esser, H G, Philipps, V, Sergienko, G, Gauthier, E, Bobkov, V, Fahrbach, H U, Hartmann, D A, Noterdaeme, J M, Rohde, V, Suttrop, W, Monakhov, I, Walden, A
Format:	Artikel
Sprache:	eng
Schlagworte:	70 PLASMA PHYSICS AND FUSION TECHNOLOGY ANTENNAS ASDEX TOKAMAK COUPLING EFFICIENCY EV RANGE HELIUM HYDROGEN ICR HEATING ION CYCLOTRON-RESONANCE IONS JET TOKAMAK MIXTURES MODE CONVERSION OXYGEN PLASMA PLASMA PRODUCTION RF SYSTEMS TEXTOR TOKAMAK
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Zusammenfassung:	The present paper reviews the recent results achieved in the ICRF-DC experiments performed in helium/hydrogen mixtures in the non-circular tokamaks ASDEX Upgrade and JET and first tests of the ICRF discharges in helium/oxygen mixtures in the circular tokamak TEXTOR. Special emphasis was given to study the physics of ICRF discharges. A new recipe for safe and reliable RF plasma production [ < ne > -(3-5) x 10 exp 17/cu m, Te approximately (3-5) eV] with improved antenna coupling efficiency (by 1.5 to 3 times) and improved radial/poloidal homogeneity was proposed and successfully tested: coupling the RF power in the FW-IBW mode conversion scenario in plasmas with two ion species. The first results on ICRF wall conditioning in helium/hydrogen and in helium/oxygen mixtures are analyzed.
ISSN:	0094-243X 1551-7616
DOI:	10.1063/1.2098567