Novel Compact Electron Spectrometer for Hot Electron Measurement in Pulsed Laser Solid Interaction

摘要

Ultra-intense laser-matter interactions provide a unique source of temporally short, broad spectrum electrons, which may be utilized in many varied appli- cations. One such, which we are pursuing, is as part of a novel diagnostic to trace magnetic field lines in a magnetically-confined fusion device. An essen- tial aspect of this scheme is to have a detailed characterization of the electron angular and energy distribution. To this effect we designed and constructed a compact electron spectrometer that uses permanent magnets for electron energy dispersion and over 100 scintillating fibers coupled to a 1024x1024 pixel CCD as the detection system. This spectrometer has electron energy coverage from 10 keV to 2 MeV. 1% tested the spectrometer on a high inten- sity10 (sup 17) - 10 (sup 21) short pulse (< 100 fs) laser, JanUSP, at Lawrence Livermore National laboratory using various solid targets. The details of the spectrometer and the experimental results will be reported.