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A 2-4 keV multilayer mirrored channel for the NIF Dante system.

Authors :
Rubery MS
Ose N
Schneider M
Moore AS
Carrera J
Mariscal E
Ayers J
Bell P
Mackinnon A
Bradley D
Landen OL
Thompson N
Carpenter A
Winters S
Ehrlich B
Sarginson T
Rendon A
Liebman J
Johnson K
Merril D
Grant G
Shingleton N
Taylor A
Ruchonnet G
Stanley J
Cohen M
Kohut T
Issavi R
Norris J
Wright J
Stevers J
Masters N
Latray D
Kilkenny J
Stolte WC
Conlon CS
Troussel P
Villette B
Emprin B
Wrobel R
Lejars A
Chaleil A
Bridou F
Delmotte F
Source :
The Review of scientific instruments [Rev Sci Instrum] 2022 Nov 01; Vol. 93 (11), pp. 113502.
Publication Year :
2022

Abstract

During inertial confinement fusion experiments at the National Ignition Facility (NIF), a capsule filled with deuterium and tritium (DT) gas, surrounded by a DT ice layer and a high-density carbon ablator, is driven to the temperature and densities required to initiate fusion. In the indirect method, 2 MJ of NIF laser light heats the inside of a gold hohlraum to a radiation temperature of 300 eV; thermal x rays from the hohlraum interior couple to the capsule and create a central hotspot at tens of millions degrees Kelvin and a density of 100-200 g/cm <superscript>3</superscript> . During the laser interaction with the gold wall, m-band x rays are produced at ∼2.5 keV; these can penetrate into the capsule and preheat the ablator and DT fuel. Preheat can impact instability growth rates in the ablation front and at the fuel-ablator interface. Monitoring the hohlraum x-ray spectrum throughout the implosion is, therefore, critical; for this purpose, a Multilayer Mirror (MLM) with flat response in the 2-4 keV range has been installed in the NIF 37° Dante calorimeter. Precision engineering and x-ray calibration of components mean the channel will report 2-4 keV spectral power with an uncertainty of ±8.7%.

Details

Language :
English
ISSN :
1089-7623
Volume :
93
Issue :
11
Database :
MEDLINE
Journal :
The Review of scientific instruments
Publication Type :
Academic Journal
Accession number :
36461505
Full Text :
https://doi.org/10.1063/5.0101695