Stimulated Raman scattering in cannonball targets

Journal Article · Thu Oct 01 00:00:00 EDT 1987 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.866504· OSTI ID:6261667

Sakawa, Y; Tanaka, K A; Nishimura, H; Nakai, M; Yabe, T; Sakurai, H; Izawa, Y; Kato, Y; Mochizuki, T; Nakatsuka, M; others, and

Stimulated Raman scattering (SRS) in cannonball targets was experimentally investigated. Above the observed threshold laser intensity, the energy conversion to superhot electrons (E = 100--800 keV) shows an increase of five orders of magnitude without saturation. Major differences in observing SRS from cannonball targets and directly driven targets lie in the background electron temperature and the electron plasma density where SRS occurs. A simple model calculation is presented and is compared with the data to infer coronal temperatures. The electron density ranges from 5 x 10/sup 19/ to 3 x 10/sup 20/ cm/sup -3/ and the coronal temperature is 0.2 keV for cannonball targets including cavity targets, while the density ranges from 3 x 10/sup 20/ to 6 x 10/sup 20/ cm/sup -3/ and the temperature is 1 keV for the directly driven target. The generation efficiency of SRS light is strongly correlated with superhot electron generation.

• Research Organization: Institute of Laser Engineering, Osaka University, Suita, Osaka 565, Japan
• OSTI ID: 6261667
• Journal Information: Phys. Fluids; (United States), Vol. 30:10
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
LASER-PRODUCED PLASMA
HOT PLASMA
RAMAN EFFECT
COHERENT SCATTERING
ENERGY CONVERSION
KEV RANGE 100-1000
MATHEMATICAL MODELS
TARGETS
CONVERSION
ENERGY RANGE
KEV RANGE
PLASMA
SCATTERING
700107* - Fusion Energy- Plasma Research- Instabilities