Testing the optical components for the National Ignition Facility time-resolved soft x-ray opacity spectrometer (OpSpecTR).

Autor:	Wallace MS; Nevada National Security Site, Livermore Operations, Livermore, California 94550, USA., Peterson AE; Nevada National Security Site, Livermore Operations, Livermore, California 94550, USA., Opachich YP; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Dutra EC; Nevada National Security Site, Livermore Operations, Livermore, California 94550, USA., Knight RA; Nevada National Security Site, Livermore Operations, Livermore, California 94550, USA., Heinmiller JM; Nevada National Security Site, Livermore Operations, Livermore, California 94550, USA., Dzenitis DM; Nevada National Security Site, Livermore Operations, Livermore, California 94550, USA., Posadas R; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Miller AG; Nevada National Security Site, Livermore Operations, Livermore, California 94550, USA.; Physics Department, University of Nevada, Reno, Nevada 89557, USA., Moy K; Nevada National Security Site, Special Technologies Laboratory, Santa Barbara, California 93111, USA., Urbatsch TJ; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA., Johns HM; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA., Heeter RF; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Perry TS; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Jazyk:	angličtina
Zdroj:	The Review of scientific instruments [Rev Sci Instrum] 2024 Sep 01; Vol. 95 (9).
DOI:	10.1063/5.0218250
Abstrakt:	Opacity measurements are being carried out at the Z-facility at Sandia National Laboratories and at the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory. The current soft x-ray Opacity Spectrometer (OpSpec) used on the NIF uses two elliptically bent crystals in time-integrated mode on either an image plate or a film. Plans are under way to expand these opacity measurements into a mode of time-resolved detection, called OpSpecTR. Previously, considerations for the available hCMOS detector size and photometrics led to a crystal geometry redesign and the use of a grazing angle x-ray mirror. The mirror acts as a low-pass x-ray energy filter, reducing the contribution of higher energy x rays. The first tests of the mirror and the crystal for OpSpecTR are presented here. The size of the mirror reflection and the reflectivity is tested using a Manson x-ray source. The mirror coupled with the new elliptical crystal shape demonstrates OpSpecTR's spectral coverage. The results from the x-ray optics performance testing are shown along with the intended design. (© 2024 Author(s). Published under an exclusive license by AIP Publishing.)
Databáze:	MEDLINE
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