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Title: Stimulated Raman scattering in cannonball targets

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Institute of Laser Engineering, Osaka University, Suita, Osaka 565, Japan
OSTI Identifier:
6261667
Resource Type:
Journal Article
Journal Name:
Phys. Fluids; (United States)
Additional Journal Information:
Journal Volume: 30:10
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Sakawa, Y, Tanaka, K A, Nishimura, H, Nakai, M, Yabe, T, Sakurai, H, Izawa, Y, Kato, Y, Mochizuki, T, Nakatsuka, M, and others, and. Stimulated Raman scattering in cannonball targets. United States: N. p., 1987. Web. doi:10.1063/1.866504.
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 in cannonball targets. United States. https://doi.org/10.1063/1.866504
Sakawa, Y, Tanaka, K A, Nishimura, H, Nakai, M, Yabe, T, Sakurai, H, Izawa, Y, Kato, Y, Mochizuki, T, Nakatsuka, M, and others, and. 1987. "Stimulated Raman scattering in cannonball targets". United States. https://doi.org/10.1063/1.866504.
@article{osti_6261667,
title = {Stimulated Raman scattering in cannonball targets},
author = {Sakawa, Y and Tanaka, K A and Nishimura, H and Nakai, M and Yabe, T and Sakurai, H and Izawa, Y and Kato, Y and Mochizuki, T and Nakatsuka, M and others, and},
abstractNote = {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.},
doi = {10.1063/1.866504},
url = {https://www.osti.gov/biblio/6261667}, journal = {Phys. Fluids; (United States)},
number = ,
volume = 30:10,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 1987},
month = {Thu Oct 01 00:00:00 EDT 1987}
}