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Title: Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility

Abstract

Fusion reaction history and ablator areal density measurements for Inertial Confinement Fusion experiments at the National Ignition Facility are currently conducted using the Gamma Reaction History diagnostic (GRH_6m). Future Gas Cherenkov Detectors (GCDs) will ultimately provide ~100x more sensitivity, reduce the effective temporal response from ~100 to ~10 ps, and lower the energy threshold from 2.9 to 1.8 MeV, relative to GRH_6m. The first phase toward next generation GCDs consisted of inserting the existing coaxial GCD-3 detector into a reentrant well which puts it within 4 m of the implosion. Reaction history and ablator gamma measurement results from this Phase I are discussed. These results demonstrate viability for the follow-on Phases of (II) the use of a revolutionary new pulse-dilation photomultiplier tube to improve the effective measurement bandwidth by >10x relative to current PMT technology; and (III) the design of a NIF-specific “Super” GCD which will be informed by the assessment of the radiation background environment within the well described here.

Authors:
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)
  4. General Atomics, San Diego, CA (United States)
  5. Mission Support and Test Services, LLC, Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1483535
Report Number(s):
LA-UR-18-23895
Journal ID: ISSN 0034-6748
Grant/Contract Number:  
89233218CNA000001; NA0003624
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ICF Diagnostic, Gamma-ray, Cherenkov

Citation Formats

Herrmann, H. W., Kim, Y. H., Zylstra, A. B., Geppert-Kleinrath, H., Meaney, K. D., Young, C. S., Lopez, F. E., Fatherley, V. E., Pederson, B. J., Oertel, J. A., Hernandez, J. E., Carrera, J., Khater, H., Rubery, M. S., Horsfield, C. J., Gales, S., Leatherland, A., Hilsabeck, T., Kilkenny, J. D., Malone, R. M., and Batha, S. H.. Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility. United States: N. p., 2018. Web. doi:10.1063/1.5039378.
Herrmann, H. W., Kim, Y. H., Zylstra, A. B., Geppert-Kleinrath, H., Meaney, K. D., Young, C. S., Lopez, F. E., Fatherley, V. E., Pederson, B. J., Oertel, J. A., Hernandez, J. E., Carrera, J., Khater, H., Rubery, M. S., Horsfield, C. J., Gales, S., Leatherland, A., Hilsabeck, T., Kilkenny, J. D., Malone, R. M., & Batha, S. H.. Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility. United States. doi:10.1063/1.5039378.
Herrmann, H. W., Kim, Y. H., Zylstra, A. B., Geppert-Kleinrath, H., Meaney, K. D., Young, C. S., Lopez, F. E., Fatherley, V. E., Pederson, B. J., Oertel, J. A., Hernandez, J. E., Carrera, J., Khater, H., Rubery, M. S., Horsfield, C. J., Gales, S., Leatherland, A., Hilsabeck, T., Kilkenny, J. D., Malone, R. M., and Batha, S. H.. Tue . "Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility". United States. doi:10.1063/1.5039378.
@article{osti_1483535,
title = {Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility},
author = {Herrmann, H. W. and Kim, Y. H. and Zylstra, A. B. and Geppert-Kleinrath, H. and Meaney, K. D. and Young, C. S. and Lopez, F. E. and Fatherley, V. E. and Pederson, B. J. and Oertel, J. A. and Hernandez, J. E. and Carrera, J. and Khater, H. and Rubery, M. S. and Horsfield, C. J. and Gales, S. and Leatherland, A. and Hilsabeck, T. and Kilkenny, J. D. and Malone, R. M. and Batha, S. H.},
abstractNote = {Fusion reaction history and ablator areal density measurements for Inertial Confinement Fusion experiments at the National Ignition Facility are currently conducted using the Gamma Reaction History diagnostic (GRH_6m). Future Gas Cherenkov Detectors (GCDs) will ultimately provide ~100x more sensitivity, reduce the effective temporal response from ~100 to ~10 ps, and lower the energy threshold from 2.9 to 1.8 MeV, relative to GRH_6m. The first phase toward next generation GCDs consisted of inserting the existing coaxial GCD-3 detector into a reentrant well which puts it within 4 m of the implosion. Reaction history and ablator gamma measurement results from this Phase I are discussed. These results demonstrate viability for the follow-on Phases of (II) the use of a revolutionary new pulse-dilation photomultiplier tube to improve the effective measurement bandwidth by >10x relative to current PMT technology; and (III) the design of a NIF-specific “Super” GCD which will be informed by the assessment of the radiation background environment within the well described here.},
doi = {10.1063/1.5039378},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
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This content will become publicly available on October 30, 2019
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