Ion Cyclotron Wall Conditioning Experiments on Tore Supra in Presence of the Toroidal Magnetic Field

Journal Article · Thu Nov 26 00:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3273721· OSTI ID:21335699

Wauters, T; Douai, D; Bremond, S; Lombard, G; Pegourie, B; Tsitrone, E ^[1]; de la Cal, E ^[2]; Lyssoivan, A; Van Schoor, M ^[3]; Van Oost, G ^[4]

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1. CEA, IRFM, 13108 Saint-Paul-lez-Durance (France)
2. Laboratorio Nacional de Fusion-CIEMAT, 28040 Madrid (Spain)
3. ERM/KMS, LPP, 1000 Brussels (Belgium)
4. Ghent University, Department of Applied Physics, 9000 Ghent (Belgium)

Wall conditioning techniques applicable in the presence of the high toroidal magnetic field will be required for the operation of ITER for tritium removal, isotopic ratio control and recovery to normal operation after disruptions. Recently ion cyclotron wall conditioning (ICWC) experiments have been carried out on Tore Supra in order to assess the efficiency of this technique in ITER relevant conditions. The ICRF discharges were operated in He/H{sub 2} mixtures at the Tore Supra nominal field (3.8 T) and a RF frequency of 48 MHz, i.e. within the ITER operational space. RF pulses of 60 s (max.) were applied using a standard Tore Supra two-strap resonant double loop antenna in ICWC mode, operated either in {pi} or 0-phasing with a noticeable improvement of the RF coupling in the latter case. In order to assess the efficiency of the technique for the control of isotopic ratio the wall was first preloaded using a D{sub 2} glow discharge. After 15 minutes of ICWC in He/H{sub 2} gas mixtures the isotopic ratio was altered from 4% to 50% at the price of an important H implantation into the walls. An overall analysis comparing plasma production and the conditioning efficiency as a function of discharge parameters is given.

• OSTI ID: 21335699
• Journal Information: AIP Conference Proceedings, Vol. 1187, Issue 1; Conference: 18. topical conference on radio frequency power in plasmas, Gent (Belgium), 24-26 Jun 2009; Other Information: DOI: 10.1063/1.3273721; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
COUPLING
EFFICIENCY
GLOW DISCHARGES
HYDROGEN
ICR HEATING
IONS
ISOTOPE RATIO
ITER TOKAMAK
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
MHZ RANGE
PLASMA
PLASMA IMPURITIES
PLASMA PRODUCTION
STEADY-STATE CONDITIONS
TORE SUPRA TOKAMAK
TRITIUM
WALL EFFECTS