Design and simulation of multilayer coatings for a multi-channel Wolter-like x-ray imager with large field of view and high resolution

Author:

Ravinet N.1ORCID,Meltchakov E.1ORCID,Lejars A.2,Troussel Ph.2ORCID,Do A.3ORCID,Kozioziemski B.3ORCID,Delmotte F.1ORCID

Affiliation:

1. Université Paris-Saclay, Institut d’Optique Graduate School, CNRS, Laboratoire Charles Fabry 1 , 91127 Palaiseau, France

2. CEA, Centre DAM Ile-de-France 2 , F-91197 Arpajon, France

3. Lawrence Livermore National Laboratory 3 , Livermore, California 94550, USA

Abstract

X-ray diagnostics are key instruments for understanding the physics behind inertial confinement fusion experiments. We report on the multilayer design optimization for the Toroidal X-ray Imager (TXI), a hard x-rays microscope instrument designed by Commissariat à l’énergie atomique (CEA) and Laboratoire Charles Fabry (LCF) to be installed on the National Ignition Facility. TXI includes six channels designed for three different energy bands centered on 8.7, 13, and 17.5 keV. Each channel is made up of two toroidal mirrors arranged in a Wolter-like configuration. The required field of view is 800 × 400 µm2, and the resolution should be better than 5 µm. In addition, we seek to estimate the spatial distribution of the temperature, which requires no spectral overlap of the different energy bands and a good spectral homogeneity of the image produced. The development of the multilayer coatings was performed in a two-step method. First, the coatings were optimized to obtain proper energy bands. Then, an x-ray tracing code was used to calculate the integrated optical response of each channel and adjust the response of the mirror to fulfill the requirements. To fulfill all the specifications, we propose an original design using a combination of two aperiodic coatings, one with a narrow bandwidth and the other one with a larger bandwidth.

Funder

U.S. Department of Energy

Lawrence Livermore National Laboratory

Publisher

AIP Publishing

Subject

Instrumentation

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