High-Energy Density science at the Linac Coherent Light Source

8th International Conference on Inertial Fusion Sciences and Applications

Glenzer, S.H.^1 ; Fletcher, L.B.^1 ; Hastings, J.B.^1

SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park

CA

94025, United States^1

关键词: Extreme conditions;    Free-electron density;    High energy density science;    Linac Coherent Light Source;    Plasmon oscillations;    Pump-probe experiments;    Sensitive functions;    X ray Thomson scattering;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012020/pdf
DOI  :  10.1088/1742-6596/688/1/012020

来源: IOP

【 摘 要 】

The Matter in Extreme Conditions end station at the Linac Coherent Light Source holds great promise for novel pump-probe experiments to make new discoveries in high- energy density science. In recent experiments we have demonstrated the first spectrally- resolved measurements of plasmons using a seeded 8-keV x-ray laser beam. Forward x-ray Thomson scattering spectra from isochorically heated solid aluminum show a well-resolved plasmon feature that is down-shifted in energy by 19 eV from the incident 8 keV elastic scattering feature. In this spectral range, the simultaneously measured backscatter spectrum shows no spectral features indicating observation of collective plasmon oscillations on a scattering length comparable to the screening length. This technique is a prerequisite for Thomson scattering measurements in compressed matter where the plasmon shift is a sensitive function of the free electron density and where the plasmon intensity provides information on temperature.