High resolution laser induced fluorescence Doppler velocimetry utilizing saturated absorption spectroscopy

A high resolution laser induced fluorescence (LIF) system has been developed to measure the flow velocity field of neutral particles in an electron-cyclotron-resonance argon plasma. The flow velocity has been determined by the Doppler shift of the LIF spectrum, which is proportional to the velocity...

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Bibliographic Details
Published in:Review of scientific instruments 2009-05, Vol.80 (5), p.053505-053505-4
Main Authors: Aramaki, Mitsutoshi, Ogiwara, Kohei, Etoh, Shuzo, Yoshimura, Shinji, Tanaka, Masayoshi Y.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION SPECTROSCOPY
ACCURACY
ARGON
DISTRIBUTION FUNCTIONS
DOPPLER EFFECT
ELECTRON CYCLOTRON-RESONANCE
FABRY-PEROT INTERFEROMETER
FLUORESCENCE
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LASER DOPPLER ANEMOMETERS
LASERS
NEUTRAL PARTICLES
PLASMA
RESOLUTION
WAVELENGTHS
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Summary:A high resolution laser induced fluorescence (LIF) system has been developed to measure the flow velocity field of neutral particles in an electron-cyclotron-resonance argon plasma. The flow velocity has been determined by the Doppler shift of the LIF spectrum, which is proportional to the velocity distribution function. Very high accuracy in velocity determination has been achieved by installing a saturated absorption spectroscopy unit into the LIF system, where the absolute value and scale of laser wavelength are determined by using the Lamb dip and the fringes of a Fabry–Pérot interferometer. The minimum detectable flow velocity of a newly developed LIF system is ±2 m/s, and this performance remains unchanged in a long-time experiment. From the radial measurements of LIF spectra of argon metastable atoms, it is found that there exists an inward flow of neutral particles associated with neutral depletion.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3127581