South pole bang-time diagnostic on the National Ignition Facility

The south pole bang-time (SPBT) diagnostic views National Ignition Facility (NIF) implosions through the lower hohlraum laser entrance hole to measure the time of peak x-ray emission (peak compression) in indirect drive implosions. Five chemical-vapor-deposition (CVD) diamond photoconductive detecto...

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Bibliographic Details
Main Authors: MacPhee, A, Edgell, D, Bradley, D K, Bond, E J, Burns, S, Callahan, D A, Celeste, J, Kimbrough, J, Mackinnon, A J, Magoon, J, Eckart, M J, Glebov, V, Hey, D, Lacielle, G, Kilkenny, J, Parker, J, Sangster, T C, Shoup, M J, Stoeckl, C, Thomas, T
Language:unknown
Published: 2021
Subjects:
36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
42 ENGINEERING
ACCURACY
CHEMICAL VAPOR DEPOSITION
COMPRESSION
DIAMONDS
GRAPHITE
IMPLOSIONS
LASERS
MIRRORS
MONOCHROMATORS
PLASMA DIAGNOSTICS
REMOVAL
RESPONSE FUNCTIONS
US NATIONAL IGNITION FACILITY
South Pole
South pole
Online Access:http://www.osti.gov/servlets/purl/1043656
https://www.osti.gov/biblio/1043656
Description
Summary:The south pole bang-time (SPBT) diagnostic views National Ignition Facility (NIF) implosions through the lower hohlraum laser entrance hole to measure the time of peak x-ray emission (peak compression) in indirect drive implosions. Five chemical-vapor-deposition (CVD) diamond photoconductive detectors (PCD's) with different filtrations and sensitivities record the time-varying x rays emitted by the target. Wavelength-selecting highly oriented pyrolytic graphite (HOPG) crystal mirror monochromators increase the x-ray signal-to-background ratio by filtering for 11-keV emission. Diagnostic timing and the in-situ temporal instrument response function are determined from laser impulse shots on the NIF. After signal deconvolution and background removal, the bang time is determined to 45-ps accuracy. The x-ray 'yield' (mJ/sr/keV at 11 keV) is determined from the total area under the peak.

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