Experiments on nonlinear absorption of ECH waves in MTX and a comparison with theory
Copyright policy )Experiments on nonlinear absorption of ECH waves in MTX and a comparison with theory
Intense pulse electron cyclotron heating (ECH) experiments have been carried out on the MTX tokamak. Rf pulses at 140 GHz with peak power of 1–2 GW and 25 ns pulse length were generated by the ETA‐II/IM FEL and transported quasi‐optically to MTX for O‐mode launch. Because of the intense rf electric fields (∼250 kV/cm), reduction of plasma absorption by nonlinear effects was predicted and several rf beam geometries (kII gradient) were investigated to study their effect on the absorption. Measurements of beam transmission showed increases, compared to low power (2 kW), which agreed with theory to within the data scatter. For these experiments x‐ray, ECE, and Thomson diagnostics showed evidence for localized absorption at the cyclotron resonance and hot electron production. A comparison of these results with calculations from the orbit following code ORPAT will be presented.
- Lawrence Berkeley National Laboratory United States
- University of North Texas United States
- University of Teacher Education Fukuoka Japan
- University of North Texas United States
- Lawrence Berkeley National Laboratory United States
Energy Absorption, Electric Fields, Resonance Absorption 700350, Mtx Tokamak, Plasma Heating, Heating, Electron Cyclotron-Resonance, O Codes, Current Drive, And Interactions, Nonlinear Problems, Microwave Radiation, 70 Plasma Physics And Fusion Technology, Wave Propagation, Ghz Range 100-1000, Plasma Production, Power Range 01-10 Gw
Energy Absorption, Electric Fields, Resonance Absorption 700350, Mtx Tokamak, Plasma Heating, Heating, Electron Cyclotron-Resonance, O Codes, Current Drive, And Interactions, Nonlinear Problems, Microwave Radiation, 70 Plasma Physics And Fusion Technology, Wave Propagation, Ghz Range 100-1000, Plasma Production, Power Range 01-10 Gw
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