Detection of lower hybrid waves by coherent scattering of microwaves: Preliminary results in Wega
Abstract
The coherent scattering of a microwave beam is considered as a diagnostic tool for monitoring the penetration of the lower hybrid heating waves in a plasma. A set up using a 2 mm wavelength has been installed on the Wega torus. Preliminary experimental data are reported and discussed. The amplitude of the electron density fluctuations has been found lower than the one we expected. The variation of the wave amplitude as the plasma density varies, qualitatively agrees with a cold plasma electromagnetic theory. The feasibility of the measurements was checked and indications of some improvements to be made in the diagnostic method came out. Some important topics (both theoretical and practical) in scattering experiments on L.H. heating waves are reviewed.
- Publication:
-
International Journal of Infrared and Millimeter Waves
- Pub Date:
- July 1981
- DOI:
- 10.1007/BF01007274
- Bibcode:
- 1981IJIMW...2..713I
- Keywords:
-
- Coherent Scattering;
- Microwave Scattering;
- Plasma Heating;
- Plasma-Electromagnetic Interaction;
- Tokamak Devices;
- Cold Plasmas;
- Electron Density (Concentration);
- Incident Radiation;
- Plasma Density;
- Plasma Physics;
- coherent scattering;
- hybrid resonance;
- plasma heating;
- density fluctuations;
- microwaves