Author/Authors :
Booth، نويسنده , , N. and Clarke، نويسنده , , R.J. and Doria، نويسنده , , D. and Gizzi، نويسنده , , L.A. and Gregori، نويسنده , , G. and Hakel، نويسنده , , P. and Koester، نويسنده , , P. and Labate، نويسنده , , L. and Levato، نويسنده , , T. and Li، نويسنده , , B. and Makita، نويسنده , , M. and Mancini، نويسنده , , R.C. and Pasley، نويسنده , , J. and Rajeev، نويسنده , , P.P. and Riley، نويسنده , , D. and Robinson، نويسنده , , A.P.L. and Wagenaa، نويسنده ,
Abstract :
Here we present results from ultra-intense experiments demonstrating the viability of polarization spectroscopy as a diagnostic of the electron return current and spatial anisotropy and distribution function of the fast electron beam. The measurements extend to ultra-relativistic intensities of 1021 W cm−2, including laser–plasma interaction regimes important for fast ignition studies, for example HiPER, and the development of secondary sources from next generation ultra-short pulse, ultra-intense laser facilities such as Astra-Gemini and ELI. As an in situ diagnostic, spectroscopic measurements are vital to understanding fast electron beams, enabling extrapolation of results to define fast ignition inertial confinement fusion and secondary source facilities.
Keywords :
Laser-produced plasmas , X-ray polarization spectroscopy , Electron distribution function , Fast electrons , Return current
