An x-ray penumbral imager for measurements of electron-temperature profiles in inertial confinement fusion implosions at OMEGA

P J Adrian; J Frenje; B Aguirre; B Bachmann; A Birkel; M Gatu Johnson; N V Kabadi; B Lahmann; C K Li; O M Mannion; W Martin; Z L Mohamed; S P Regan; H G Rinderknecht; B Scheiner; M J Schmitt; F H Séguin; R C Shah; H Sio; C Sorce; G D Sutcliffe; R D Petrasso

doi:10.1063/5.0041038

An x-ray penumbral imager for measurements of electron-temperature profiles in inertial confinement fusion implosions at OMEGA

Rev Sci Instrum. 2021 Apr 1;92(4):043548. doi: 10.1063/5.0041038.

Authors

P J Adrian¹, J Frenje¹, B Aguirre², B Bachmann³, A Birkel¹, M Gatu Johnson¹, N V Kabadi¹, B Lahmann¹, C K Li¹, O M Mannion⁴, W Martin², Z L Mohamed⁴, S P Regan⁴, H G Rinderknecht⁴, B Scheiner⁵, M J Schmitt⁵, F H Séguin¹, R C Shah⁴, H Sio³, C Sorce⁴, G D Sutcliffe¹, R D Petrasso¹

Affiliations

¹ Plasma Science and Fusion Center: MIT, Cambridge, Massachusetts 02139, USA.
² Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
³ Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
⁴ Laboratory for Laser Energetics: University of Rochester, Rochester, New York 14623, USA.
⁵ Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA.

PMID: 34243391
DOI: 10.1063/5.0041038

Abstract

Hot-spot shape and electron temperature (T_e) are key performance metrics used to assess the efficiency of converting shell kinetic energy into hot-spot thermal energy in inertial confinement fusion implosions. X-ray penumbral imaging offers a means to diagnose hot-spot shape and T_e, where the latter can be used as a surrogate measure of the ion temperature (T_i) in sufficiently equilibrated hot spots. We have implemented a new x-ray penumbral imager on OMEGA. We demonstrate minimal line-of-sight variations in the inferred T_e for a set of implosions. Furthermore, we demonstrate spatially resolved T_e measurements with an average uncertainty of 10% with 6 μm spatial resolution.