Influence of antenna aiming on ECE in MAST | Zendy

Josef Preinhaelter | Zendy; J. Urbán | Zendy; P. Pavlo | Zendy; Vladimir Shevchenko | Zendy; M. Valovič | Zendy; Linda Vahala | Zendy; George Vahala | Zendy

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Influence of antenna aiming on ECE in MAST

Author(s) -

Josef Preinhaelter,

J. Urbán,

P. Pavlo,

Vladimir Shevchenko,

M. Valovič,

Linda Vahala,

George Vahala

Publication year - 2004

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.1783601

Subject(s) - plasma , polarization (electrochemistry) , gyrotron , mast (botany) , beam (structure) , atomic physics , plasma diagnostics , antenna (radio) , optics , physics , materials science , nuclear magnetic resonance , mast cell , nuclear physics , chemistry , medicine , electron , telecommunications , immunology , computer science

The effect of the direction of the detected beam on the intensity of ECE is studied. It is found that the combined effects of the strong dependence of the conversion efficiencey of O mode at the plasma resonance on the direction of the incident wave and the partial screening of the beam waist by the MAST vessel wall, can be responsible for the weakening of ECE emission for some frequencies. The theoretical model for ECE data interpretation on MAST has been significantly improved. New features of the model are as follows: the quasioptical treatment of the receiving antenna, interference, polarization and screening effects of the vacuum window and collisional damping of EBWs in the peripheral plasma.

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