Design of the opacity spectrometer for opacity measurements at the National Ignition Facility

P W Ross; R F Heeter; M F Ahmed; E Dodd; E J Huffman; D A Liedahl; J A King; Y P Opachich; M B Schneider; T S Perry

doi:10.1063/1.4962819

Design of the opacity spectrometer for opacity measurements at the National Ignition Facility

Rev Sci Instrum. 2016 Nov;87(11):11D623. doi: 10.1063/1.4962819.

Authors

P W Ross¹, R F Heeter², M F Ahmed², E Dodd³, E J Huffman¹, D A Liedahl², J A King¹, Y P Opachich¹, M B Schneider², T S Perry³

Affiliations

¹ National Security Technologies, LLC, 161 S. Vasco Road, Livermore, California 94550, USA.
² Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA.
³ Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA.

PMID: 27910379
DOI: 10.1063/1.4962819

Abstract

Recent experiments at the Sandia National Laboratory Z facility have called into question models used in calculating opacity, of importance for modeling stellar interiors. An effort is being made to reproduce these results at the National Ignition Facility (NIF). These experiments require a new X-ray opacity spectrometer (OpSpec) spanning 540 eV-2100 eV with a resolving power E/ΔE > 700. The design of the OpSpec is presented. Photometric calculations based on expected opacity data are also presented. First use on NIF is expected in September 2016.