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Title: Design and Construction of a Gamma Reaction History Diagnostic for the National Ignition Facility

Abstract

Gas Cherenkov detectors have been used to convert fusion gammas into photons to record gamma reaction history measurements. These gas detectors include a converter, pressurized gas volume, relay collection optics, and a photon detector. A novel design for the National Ignition Facility (NIF) using 90° off-axis parabolic mirrors efficiently collects signal from fusion gammas with 8-ps time dispersion. Fusion gammas are converted to Compton electrons, which generate broadband Cherenkov light (response is from 250 to 700 nm) in a pressurized gas cell. This light is relayed into a high-speed detector using three parabolic mirrors. The relay optics collect light from a 125-mm-diameter by 600-mm-long interchangeable gas (CO2 or SF6) volume. The parabolic mirrors were electroformed instead of diamond turned to reduce scattering of the UV light. All mirrors are bare aluminum coated for maximum reflectivity. This design incorporates a 4.2-ns time delay that allows the detector to recover from prompt radiation before it records the gamma signal. At NIF, a cluster of four channels will allow for increased dynamic range, as well as different gamma energy thresholds.

Authors:
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Publication Date:
Research Org.:
National Security Technologies, LLC (United States)
Sponsoring Org.:
USDOE; USDOE National Nuclear Security Administration (NA)
OSTI Identifier:
993430
Report Number(s):
DOE/NV/25946-827
TRN: US1100006
DOE Contract Number:  
DE-AC52-06NA25946
Resource Type:
Conference
Journal Name:
Journal of Physics: Conference Series
Additional Journal Information:
Journal Volume: 244; Journal Issue: 3; Conference: 6th International Inertial Fusion Sciences and Applications Conference; San Francisco, CA; September 6-11, 2009
Publisher:
Journal of Physics
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CHERENKOV COUNTERS; CONSTRUCTION; DESIGN; OPTICS; PHOTONUCLEAR REACTIONS; US NATIONAL IGNITION FACILITY; GAMMA DETECTION; gamma reaction history, NIF

Citation Formats

Malone, R M, Evans, S C, Frogget, B C, Herrmann, H W, Kaufman, M I, Kim, Y H, Mack, J M, McGillivray, K D, Palagi, M, Stoeffl, W, Tibbitts, A, Tunnell, T W, and Young, C S. Design and Construction of a Gamma Reaction History Diagnostic for the National Ignition Facility. United States: N. p., 2009. Web. doi:10.1088/1742-6596/244/3/032052.
Malone, R M, Evans, S C, Frogget, B C, Herrmann, H W, Kaufman, M I, Kim, Y H, Mack, J M, McGillivray, K D, Palagi, M, Stoeffl, W, Tibbitts, A, Tunnell, T W, & Young, C S. Design and Construction of a Gamma Reaction History Diagnostic for the National Ignition Facility. United States. doi:10.1088/1742-6596/244/3/032052.
Malone, R M, Evans, S C, Frogget, B C, Herrmann, H W, Kaufman, M I, Kim, Y H, Mack, J M, McGillivray, K D, Palagi, M, Stoeffl, W, Tibbitts, A, Tunnell, T W, and Young, C S. Thu . "Design and Construction of a Gamma Reaction History Diagnostic for the National Ignition Facility". United States. doi:10.1088/1742-6596/244/3/032052.
@article{osti_993430,
title = {Design and Construction of a Gamma Reaction History Diagnostic for the National Ignition Facility},
author = {Malone, R M and Evans, S C and Frogget, B C and Herrmann, H W and Kaufman, M I and Kim, Y H and Mack, J M and McGillivray, K D and Palagi, M and Stoeffl, W and Tibbitts, A and Tunnell, T W and Young, C S},
abstractNote = {Gas Cherenkov detectors have been used to convert fusion gammas into photons to record gamma reaction history measurements. These gas detectors include a converter, pressurized gas volume, relay collection optics, and a photon detector. A novel design for the National Ignition Facility (NIF) using 90° off-axis parabolic mirrors efficiently collects signal from fusion gammas with 8-ps time dispersion. Fusion gammas are converted to Compton electrons, which generate broadband Cherenkov light (response is from 250 to 700 nm) in a pressurized gas cell. This light is relayed into a high-speed detector using three parabolic mirrors. The relay optics collect light from a 125-mm-diameter by 600-mm-long interchangeable gas (CO2 or SF6) volume. The parabolic mirrors were electroformed instead of diamond turned to reduce scattering of the UV light. All mirrors are bare aluminum coated for maximum reflectivity. This design incorporates a 4.2-ns time delay that allows the detector to recover from prompt radiation before it records the gamma signal. At NIF, a cluster of four channels will allow for increased dynamic range, as well as different gamma energy thresholds.},
doi = {10.1088/1742-6596/244/3/032052},
journal = {Journal of Physics: Conference Series},
number = 3,
volume = 244,
place = {United States},
year = {2009},
month = {10}
}

Conference:
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