Analysis of ICRF-Accelerated Ions in ASDEX Upgrade

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

DOI:https://doi.org/10.1063/1.2800558· OSTI ID:21035933

Mantsinen, M J ^[1]; Eriksson, L -G ^[2]; Garcia-Munoz, M; Bilato, R; Bobkov, Vl; Fahrbach, H -U; Schneider, W ^[3]; Noterdaeme, J -M ^[3]

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1. Helsinki Univ. of Technology, Association Euratom-Tekes, P.O. Box 4100, FIN-02015 HUT (Finland)
2. Ass. EURATOM-CEA, CEA/DSM/DRFC, CEA Cadarache, F-13108 St. Paul lez Durance (France)
3. Max-Planck IPP-EURATOM Assoziation, Boltzmann-Str. 2, D-85748 Garching (Germany)

MHD-induced losses of fast ions with energy in the MeV range have been observed during high-power ICRF heating of hydrogen minority ions in the ASDEX Upgrade tokamak (R{sub 0}{approx_equal}1.65 m, a{approx_equal}0.5 m). ICRF heating and ICRF-driven fast ions in discharges exhibiting fast ion losses due to toroidal Alfven eigenmodes and a new core-localised MHD instability are analysed. It is found that the lost ions are ICRF-accelerated trapped protons with energy in the range of 0.3-1.6 MeV, orbit widths of 20-35 cm, and turning points at r/a>0.5 and at major radii close to the cyclotron resonance {omega} = {omega}{sub cH}(R). The presence of such protons is consistent with ICRF modelling.

• OSTI ID: 21035933
• 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: 10.1063/1.2800558; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). ASDEX Upgrade Team; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ASDEX TOKAMAK
COMPUTERIZED SIMULATION
HYDROGEN
HYDROGEN IONS
ICR HEATING
ION CYCLOTRON-RESONANCE
MAGNETOHYDRODYNAMICS
MEV RANGE
PLASMA
PLASMA INSTABILITY
PLASMA JETS
PLASMA SIMULATION
RF SYSTEMS
TRAPPED PROTONS