Multichannel HCN interferometer for electron density profile measurements of tokamak plasmas
Abstract
A multichannel interferometer designed for Tokamak plasma-density measurements is described. The phase shift experienced by the probing beam is transferred to a low-frequency signal obtained by Doppler shifting the frequency of the reference beam. This ensures a sensitivity of 0.01 fringe. The source is a CW HCN waveguide laser with 150-mW output power. Eight channels are in operation at a certain Tokamak facility. The variation of line density as a function of time for each channel is deduced from the phase-shift measurement by an on-line computer.
- Publication:
-
Journal of the Optical Society of America (1917-1983)
- Pub Date:
- July 1977
- DOI:
- 10.1364/JOSA.67.000964
- Bibcode:
- 1977JOSA...67..964V
- Keywords:
-
- Electron Density (Concentration);
- Hcn Lasers;
- Interferometers;
- Plasma Diagnostics;
- Tokamak Devices;
- Computer Techniques;
- Continuous Wave Lasers;
- Doppler Effect;
- Optical Waveguides;
- Phase Shift;
- Plasma Density;
- Plasma Physics