CO[sub 2] laser scattering technique for studying Langmuir turbulence spectra

A 12-channel system for resolving either the [omega] or [ital k] spectra of plasma Langmuir turbulence is developed. The direct detection system is operated with a scattering linewidth of order 100 GHz at scattering angles ranging from 10[sup [minus]1] to 10[sup [minus]3] rad. Stray light rejection...

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Bibliographic Details
Published in:Review of scientific instruments 1993-06, Vol.64:6
Main Authors: Vyacheslavov, L.N., Kruglyakov, E.P., Losev, M.V., Sanin, A.L.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320 - Plasma Diagnostic Techniques & Instrumentation- (1992-)
BEAM-PLASMA SYSTEMS
CARBON DIOXIDE LASERS
GAS LASERS
LASERS
LIGHT SCATTERING
OPERATION
PLASMA DIAGNOSTICS
SCATTERING
TURBULENCE
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Summary:A 12-channel system for resolving either the [omega] or [ital k] spectra of plasma Langmuir turbulence is developed. The direct detection system is operated with a scattering linewidth of order 100 GHz at scattering angles ranging from 10[sup [minus]1] to 10[sup [minus]3] rad. Stray light rejection of up to 13 orders of magnitude is provided by an ammonia-filled gas cell. It is possible to vary the absorption frequency width from 20 MHz to 5 GHz keeping absorption in the ammonia line center constant. The [omega] and [ital k] spectra of Langmuir turbulence excited in the plasma by a high-current relativistic electron beam are measured via the technique described.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1144050