Experimental characterization of anomalous strong scattering of mm-waves in TEXTOR plasmas with rotating islands
Autor: | Nielsen, S.K., Salewski, M., Westerhof, E., Bongers, W., Korsholm, S.B., Leipold, F., Oosterbeek, J.W., Moseev, D., Stejner, M., team, TEXTOR |
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Přispěvatelé: | Science and Technology of Nuclear Fusion |
Rok vydání: | 2013 |
Předmět: |
Physics
Anomalous scattering Condensed matter physics Scattering Amplifier Plasma Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas law.invention Magnetic field Nuclear Energy and Engineering law Physics::Plasma Physics Gyrotron 0103 physical sciences Millimeter Atomic physics 010306 general physics Beam (structure) |
Zdroj: | Plasma Physics and Controlled Fusion, 55, 115003 Nielsen, S K, Salewski, M, Westerhof, E, Bongers, W, Korsholm, S B, Leipold, F, Oosterbeek, J W, Moseev, D & Stejner Pedersen, M 2013, ' Experimental characterization of anomalous strong scattering of mm-waves in TEXTOR plasmas with rotating islands ', Plasma Physics and Controlled Fusion, vol. 55, no. 11, 115003 . https://doi.org/10.1088/0741-3335/55/11/115003 Plasma Physics and Controlled Fusion, 55(11):115003, 115003-1/11. Institute of Physics |
ISSN: | 0741-3335 |
Popis: | Anomalous scattering of high power millimetre waves from gyrotrons at 140 and 110 GHz is investigated for plasma with rotating islands at TEXTOR. The magnetic field and plasma density influence the spectral content of the scattered waves and their power levels significantly. Anomalous strong scattering occurs in two density regimes, one at low densities and one at high densities, that also depend on the magnetic field. The two regimes are separated by a quiescent regime without anomalous scattering. Investigations suggest that scattering in the high-density regime is generated at the low-field side intersection of the gyrotron beam and the island position. The transition from the quiescent regime to the high-density regime occurs when the gyrotron frequency is twice the upper hybrid frequency at this position. There is some evidence that the scattering in the low-density regime is generated near the plasma centre. Under this assumption all the observed scattering is generated when the gyrotron frequency is near or below twice the upper hybrid frequency. |
Databáze: | OpenAIRE |
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