Measurement of Electron Temperature and Plasma Density via Thomson Scattering and Electric Probe in Low Temperature Plasmas
Abstract
Laser Thomson scattering system has been developed for the measurements of electron temperature and plasma density in low temperature plasma by means of the Q-switched Nd:YAG laser with 2nd Harmonics (250 mJ at 532 nm, repetition rate of 20 Hz), triple grating spectrometer and ICCD camera. The triple grating spectrometer is composed of 3 grating (1800 gr/mm and 100 x 100 mm dimensions), 6 achromatic doublet lens (f=400 mm and 100 mm diameter) for reducing the abbreviation effect, two slits (entrance and exitance), opto- mechanical instruments, etc. The alignment and calibration of TGS system were performed by a diode laser and diffraction optics, Ne lamp (wavelength) and metal halide lamp (intensity), respectively. The LTS measurements were done wide ranges of 1 <Te < 10 and 1011 <ne <1013 cm-3 without different magnetic fields and neutral pressures in Divertor Plasma Simulator-II (DiPS-II) and it compared with the single probe measurements.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2011
- Bibcode:
- 2011APS..DPPPP9144W