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Title: Cherenkov radiation conversion and collection considerations for a gamma bang time/reaction history diagnostic for the NIF

Abstract

Bang time and reaction history measurements are fundamental components of diagnosing inertial confinement fusion (ICF) implosions and will be essential contributors to diagnosing attempts at ignition on the National Ignition Facility (NIF). Fusion gammas provide a direct measure of fusion interaction rate without being compromised by Doppler spreading. Gamma-based gas Cherenkov detectors that convert fusion gamma rays to optical Cherenkov photons for collection by fast recording systems have been developed and fielded at Omega. These systems have established their usefulness in illuminating ICF physics in several experimental campaigns. Bang time precision better than 25 ps has been demonstrated, well below the 50 ps accuracy requirement defined by the NIF system design requirements. A comprehensive, validated numerical study of candidate systems is providing essential information needed to make a down selection based on optimization of sensitivity, bandwidth, dynamic range, cost, and NIF logistics. This paper presents basic design considerations arising from the two-step conversion process from {gamma} rays to relativistic electrons to UV/visible Cherenkov radiation.

Authors:
; ;  [1];  [2];  [3];  [4]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. National Security Technologies, Los Alamos Operations, Los Alamos, New Mexico 87544 (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  4. Atomic Weapons Establishment, Aldermaston (United Kingdom)
Publication Date:
OSTI Identifier:
21266520
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 79; Journal Issue: 10; Conference: HTPD08: 17. topical conference on high-temperature plasma diagnostics, Albuquerque, NM (United States), 11-15 May 2008; Other Information: DOI: 10.1063/1.2979868; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCURACY; CHERENKOV COUNTERS; CHERENKOV RADIATION; DESIGN; ELECTRONS; GAMMA RADIATION; GAS SCINTILLATION DETECTORS; INERTIAL CONFINEMENT; NUMERICAL ANALYSIS; PLASMA; PLASMA PRODUCTION; RECORDING SYSTEMS; RELATIVISTIC RANGE; SENSITIVITY; THERMONUCLEAR REACTORS; US NATIONAL IGNITION FACILITY

Citation Formats

Herrmann, Hans W, Mack, Joseph M, Young, Carlton S, Malone, Robert M, Stoeffl, Wolfgang, and Horsfield, Colin J. Cherenkov radiation conversion and collection considerations for a gamma bang time/reaction history diagnostic for the NIF. United States: N. p., 2008. Web. doi:10.1063/1.2979868.
Herrmann, Hans W, Mack, Joseph M, Young, Carlton S, Malone, Robert M, Stoeffl, Wolfgang, & Horsfield, Colin J. Cherenkov radiation conversion and collection considerations for a gamma bang time/reaction history diagnostic for the NIF. United States. https://doi.org/10.1063/1.2979868
Herrmann, Hans W, Mack, Joseph M, Young, Carlton S, Malone, Robert M, Stoeffl, Wolfgang, and Horsfield, Colin J. Wed . "Cherenkov radiation conversion and collection considerations for a gamma bang time/reaction history diagnostic for the NIF". United States. https://doi.org/10.1063/1.2979868.
@article{osti_21266520,
title = {Cherenkov radiation conversion and collection considerations for a gamma bang time/reaction history diagnostic for the NIF},
author = {Herrmann, Hans W and Mack, Joseph M and Young, Carlton S and Malone, Robert M and Stoeffl, Wolfgang and Horsfield, Colin J},
abstractNote = {Bang time and reaction history measurements are fundamental components of diagnosing inertial confinement fusion (ICF) implosions and will be essential contributors to diagnosing attempts at ignition on the National Ignition Facility (NIF). Fusion gammas provide a direct measure of fusion interaction rate without being compromised by Doppler spreading. Gamma-based gas Cherenkov detectors that convert fusion gamma rays to optical Cherenkov photons for collection by fast recording systems have been developed and fielded at Omega. These systems have established their usefulness in illuminating ICF physics in several experimental campaigns. Bang time precision better than 25 ps has been demonstrated, well below the 50 ps accuracy requirement defined by the NIF system design requirements. A comprehensive, validated numerical study of candidate systems is providing essential information needed to make a down selection based on optimization of sensitivity, bandwidth, dynamic range, cost, and NIF logistics. This paper presents basic design considerations arising from the two-step conversion process from {gamma} rays to relativistic electrons to UV/visible Cherenkov radiation.},
doi = {10.1063/1.2979868},
url = {https://www.osti.gov/biblio/21266520}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 79,
place = {United States},
year = {2008},
month = {10}
}