Development of a high resolution x-ray spectrometer for the National Ignition Facility (NIF)

作者：Hill K W^*; Bitter M; Delgado Aparicio L; Efthimion P C; Ellis R; Gao L; Maddox J; Pablant N A; Schneider M B; Chen H; Ayers S; Kauffman R L; MacPhee A G; Beiersdorfer P; Bettencourt R; Ma T; Nora R C; Scott H A; Thorn D B; Kilkenny J D; Nelson D; Shoup M III; Maron Y

来源：Review of Scientific Instruments, 2016, 87(11): 11E344.

DOI：10.1063/1.4962053

A high resolution (E/Delta E = 1200-1800) Bragg crystal x-ray spectrometer is being developed to measure plasma parameters in National Ignition Facility experiments. The instrument will be a diagnostic instrument manipulator positioned cassette designed mainly to infer electron density in compressed capsules from Stark broadening of the helium-beta (1s(2)-1s3p) lines of krypton and electron temperature from the relative intensities of dielectronic satellites. Two conically shaped crystals will diffract and focus (1) the Kr He beta complex and (2) the He alpha (1s(2)-1s2p) and Ly alpha (1s-2p) complexes onto a streak camera photocathode for time resolved measurement, and a third cylindrical or conical crystal will focus the full He alpha to He beta spectral range onto an image plate to provide a time integrated calibration spectrum. Calculations of source x-ray intensity, spectrometer throughput, and spectral resolution are presented. Details of the conical-crystal focusing properties as well as the status of the instrumental design are also presented. Published by AIP Publishing.

• 出版日期2016-11