ICRH of JET and LHD Majority Ions at Their Fundamental Cyclotron Frequency

Journal Article · Fri Sep 28 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2800526· OSTI ID:21035901

Krasilnikov, A V; Kaschuck, Yu A; Amosov, V N ^[1]; Van Eester, D; Lerche, E ^[2]; Ongena, J; Bonheure, G ^[2]; Mailloux, J; Stamp, M; Jachmich, S; Leggate, H; Walden, A; Mayoral, M -L; Santala, M; Kiptily, V; Popovichev, S ^[3]; Vdovin, V ^[4]; Biewer, T ^[3]; Crombe, K ^[3]; Esposito, B ^[5]

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1. SRC RF Troitsk Institute for Innovating and Fusion Research, Troitsk (Russian Federation)
2. Laboratory for Plasma Physics--ERM/KMS, TEC partner, Brussels (Belgium)
3. Euratom-UKAEA Fus. Assoc., Culham Science Center (United Kingdom)
4. RNC Kurchatov Institute, Nuclear Fusion Institute, Moscow (Russian Federation)
5. ENEA, Frascati (Italy)

Results of the experimental studies of ICRH at the fundamental cyclotron frequency of the majority deuterons in JET plasmas with near-tangential deuteron neutral beam injection (NBI) are presented. 1D, 2D and 3D ICRH modeling indicated that several ITER relevant mechanisms of heating may occur simultaneously in this heating scheme: fundamental ion cyclotron resonance heating of majority and beam D ions, impurity ion heating and electron heating due to Landau damping and TTMP. These mechanisms were studied in JET experiments with a {approx}90% D, 5% H plasma including traces of Be and Ar. Up to 2MW of ICRH power was applied at 25 MHz to NBI heated plasmas. In most of the discharges the toroidal magnetic field strength was 3.3T, but in one it was equal to 3.6T. The E{sub +} component of the electric field governs the ion cyclotron heating of not too fast particles. The Doppler shifted RF absorption of the beam deuterons away from the cold resonance at which E{sub +} is small was exploited to enhance the RF power absorption efficiency. Fundamental ICRH experiments were also carried out in LHD hydrogen plasma with high energy hydrogen NBI. ICRH was performed at 38MHz with injected power <1 MW. The effect of fundamental ICRH was clearly demonstrated in both machines.

• OSTI ID: 21035901
• Journal Information: AIP Conference Proceedings, Vol. 933, Issue 1; Conference: 17. topical conference on radio frequency power in plasmas, Clearwater, FL (United States), 7-9 May 2007; Other Information: DOI: 10.1063/1.2800526; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). Collaboration: JET EFDA Task Force Heating JET EFDA Contributors; LHD Team; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
COMPUTERIZED SIMULATION
CYCLOTRON FREQUENCY
DEUTERONS
DOPPLER EFFECT
ELECTRIC FIELDS
ELECTRONS
HYDROGEN
ICR HEATING
ITER TOKAMAK
JET TOKAMAK
LANDAU DAMPING
LHD DEVICE
MAGNETIC FIELDS
MHZ RANGE
PLASMA
PLASMA BEAM INJECTION
PLASMA JETS
PLASMA SIMULATION
TRANSIT-TIME MAGNETIC PUMPING