| Autor: |
Cordova T; University of California San Diego, San Diego, California 92093, USA., MacDonald MJ; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Döppner T; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Beg FN; University of California San Diego, San Diego, California 92093, USA., Dozieres M; General Atomics, San Diego, California 92121, USA., Kozioziemski B; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Pablant NA; Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA., Sorce CM; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA., Whiting NG; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA. |
| Abstrakt: |
In this study, we present the absolute calibration of the conical crystal for the zinc spectrometer (ZSPEC), an x-ray spectrometer at the OMEGA laser facility at the Laboratory for Laser Energetics. The ZSPEC was originally designed to measure x-ray Thomson scattering using flat or cylindrically curved highly oriented pyrolytic graphite crystals centered around Zn He-alpha emission at 9 keV. To improve the useful spectral range and collection efficiency of the ZSPEC, a conical highly annealed pyrolytic graphite crystal was fabricated for the ZSPEC. The conically bent crystal in the Hall geometry produces a line focus perpendicular to the spectrometer axis, corresponding to the detector plane of electronic detectors at large scale laser facilities such as OMEGA, extending the useful range of the spectrometer to 7-11 keV. Using data collected using a microfocus Mo x-ray source, we determine important characteristics of ZSPEC such as the dispersion, spatial resolution, and absolute sensitivity of the instrument. A ray-trace model of ZSPEC provides another point of agreement in calculations of the ZSPEC dispersion and crystal response. |
