Scattering of a CO/sub 2/ laser beam by waves excited in a plasma by a modulated ion beam

Journal Article · Sun Sep 01 04:00:00 EDT 1985 · Sov. Phys. - Tech. Phys. (Engl. Transl.); (United States)

OSTI ID:5871310

Bulanin, V V; Karfidov, D M; Kupriyanova, E B; Petrov, A V; Sergeichev, K F; Chekmarev, A M

Experiments on the scattering of a CO/sub 2/ laser beam by space-charge waves of an ion beam are reported. The waves are excited in a decaying plasma with a density of 10/sup 10/--10/sup 12/ cm/sup 3/ and an electron temperature of 1--3 eV. The wave phase velocity is close to the ion beam velocity and may significantly exceed the ion acoustic velocity. The wavelengths are 2--4 mm at a wave frequency of 4 MHz. Data obtained on the waves by a probe method are compared with data obtained from laser scattering. This comparison yields an estimate of the sensitivity and spectral resolution of the use of the scattering of a CO/sub 2/ laser beam to determine oscillations in the electron density. The sensitivity of the diagnostic technique developed here is deltanapprox.10/sup 8/ cm/sup -3/ (deltan is the amplitude of the density oscillations), and the resolution in terms of wave number is ..delta..k = 2.5 cm/sup -1/.

• Research Organization: P. N. Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
• OSTI ID: 5871310
• Journal Information: Sov. Phys. - Tech. Phys. (Engl. Transl.); (United States), Journal Name: Sov. Phys. - Tech. Phys. (Engl. Transl.); (United States) Vol. 30:9; ISSN SPTPA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BEAMS
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELECTRON TEMPERATURE
INFRARED RADIATION
ION BEAMS
LASER RADIATION
LIGHT SCATTERING
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA WAVES
RADIATIONS
RESOLUTION
SCATTERING
SENSITIVITY
SPACE CHARGE