Ion temperature measurement in a plasma column using pulsed CO/sub 2/ collective scattering and heterodyne detection

Journal Article · Fri Mar 01 04:00:00 EST 1985 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.334479· OSTI ID:6156456

Lachambre, J; Decoste, R; Robert, A; Noel, P

We describe a pulsed CO/sub 2/ laser scattering experiment set up to measure the ion temperature of a magnetically stabilized arc plasma (n/sub e/approx. =10/sup 21/ m/sup -3/, T/sub e/approx. =5 eV). Sensitivity and spectral resolution considerations led us to use heterodyne detection with a separate local oscillator and a multichannel rf frequency analyzer. The forward scattering angle is chosen to be 5/sup 0/ in order to match the expected ion feature spectrum to the receiver bandwidth and also to eliminate spontaneous fluctuations from the small-k larger-amplitude signal. Experimental scattering spectra illustrate the apparatus sensitivity to discharge current and gas mixture. Ion-acoustic resonances are resolved as well as the spectral signatures from various mixed ion species plasmas. The ion temperature appears to be determined to +- 10% once T/sub e/ and n/sub e/ are known from other measurements. Applications to high temperature fusion plasmas are discussed.

• Research Organization: Institut de Recherche d'Hydro-Quebec, C.P. 1000, Varennes, Quebec, Canada JOL 2PO
• OSTI ID: 6156456
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 57:5; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
CALIBRATION
ELECTRON TEMPERATURE
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUCTUATIONS
HETERODYNE RECEIVERS
ION TEMPERATURE
LASER SPECTROSCOPY
LIGHT SCATTERING
MICROWAVE EQUIPMENT
NOISE
PHOTOCONDUCTORS
PLASMA
PLASMA DIAGNOSTICS
RADIO EQUIPMENT
RESOLUTION
SCATTERING
SENSITIVITY
SPATIAL RESOLUTION
SPECTRA
SPECTROSCOPY
VARIATIONS
VISIBLE SPECTRA