Interaction of 0.53 {mu}m laser pulse with millimeter-scale plasmas generated by gasbag target

Journal Article · Fri Jun 15 00:00:00 EDT 2012 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4729332· OSTI ID:22072471

Zhichao, Li; Liang, Guo ^[1]; Jian, Zheng; Peng, Yuan ^[1]; Xiaohua, Jiang; Zhebin, Wang; Dong, Yang; Huan, Zhang; Sanwei, Li; Qiang, Yin; Fanghua, Zhu; Xiaoshi, Peng; Feng, Wang; Zheng, Yuan; Li, Chen; Shenye, Liu; Shaoen, Jiang; Yongkun, Ding ^[2]; Ping, Shao ^[3]

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1. CAS Key Laboratory of Basic Plasma Physics, and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui (China)
2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan (China)
3. Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai (China)

Detailed research on the interaction of a 0.53 {mu}m laser pulse with millimeter-scale plasmas produced by a gasbag target on the Shengguang-II facility is presented. The x-ray pinhole images confirm that millimeter-scale plasmas are generated and the x-ray framing images show a temporal window of 0.6-1.1 ns during which the millimeter-scale plasmas exist. The electron temperature is measured with a collective Thomson scattering system, providing 0.64 keV for C{sub 5}H{sub 12} and 1.8 keV for Xe plasmas. The electron density is inferred from the stimulated Raman scattering spectra. The experimental spectra show large differences for C{sub 5}H{sub 12}- and Xe-filled gasbags. A one-dimensional code based upon steady-state, kinetic linear theory is applied to calculate the stimulated Raman scattering spectra. Excellent agreement between the calculated and experimental results shows that the plasma parameters, especially the electron density and the temperature, dominate the disruption behavior of stimulated Raman scattering. The results also indicate that stimulated Raman scattering is probably located within specific region of the gasbag. The time-integrated reflectivity of both the stimulated Raman and Brillouin scattering is at a low level, even in the conditions of high laser intensity (1.5 Multiplication-Sign 10{sup 15} W/cm{sup 2}) and no beam-smoothing. The experimental results are promising for future ignition experiments with a 0.53 {mu}m laser as the driver.

• OSTI ID: 22072471
• Journal Information: Physics of Plasmas, Vol. 19, Issue 6; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
2-METHYLBUTANE
BEAM-PLASMA SYSTEMS
BRILLOUIN EFFECT
ELECTRON DENSITY
ELECTRON TEMPERATURE
KEV RANGE
LASERS
ONE-DIMENSIONAL CALCULATIONS
PLASMA
RAMAN EFFECT
STEADY-STATE CONDITIONS
THOMSON SCATTERING
X RADIATION
XENON