Propagation of intense short-pulse laser in homogeneous near-critical density plasmas

9th International Conference on Inertial Fusion Sciences and Applications

Habara, H.^1 ; Nakaguchi, S.^1 ; Uematsu, Y.^1 ; Baton, S.D.^2 ; Chen, S.N.^2 ; Fuchs, J.^2 ; Iwawaki, T.^1 ; Macdonald, M.^3,4 ; Nazarov, W.^5 ; Rousseaux, C.^6 ; Tanaka, K.A.^1

Osaka University, Suita, Osaka, Japan^1

LULI, Ecole Polytechnique, Palaiseau, France^2

University of Michigan, Ann Arbor

MI, United States^3

SLAC, National Accelerator Laboratory, Menlo Park

CA, United States^4

University of St. Andrews, St. Andrews, United Kingdom^5

CEA, DAM, DIF, Arpajon, France^6

关键词: Critical density;    Direct irradiation;    High energy X ray;    Intense short pulse lasers;    Laser propagation;    Overdense plasma;    Reflected laser light;    Ultra-intense lasers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/717/1/012019/pdf
DOI  :  10.1088/1742-6596/717/1/012019

来源: IOP

【 摘 要 】

Ultra intense laser light propagation in a homogeneous overdense plasma was investigated using a plastic foam target filling a polyimide tube. Laser propagation into overdense plasma was measured via Doppler red shift of the reflected laser light from the moving plasma at 0.3-0.4 of speed of light. We also observed strongly collimated electron beam possibly caused by the magnetic field surrounding the plasma channel, and high energy X-rays emitted via synchrotron radiation by the oscillating electrons inside the channel. These features imply that UIL propagates inside the overdense plasma as predicted in PIC calculation, and are very important for direct irradiation scheme of fast ignition.