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Title: Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility

Abstract

The next-generation Magnetic Recoil Spectrometer, called MRSt, will provide time-resolved measurements of the deuterium-tritium-neutron spectrum from inertial confinement fusion implosions at the National Ignition Facility. These measurements will provide critical information about the time evolution of the fuel assembly, hot-spot formation, and nuclear burn. The absolute neutron spectrum in the energy range of 12-16 MeV will be measured with high accuracy (~5%), unprecedented energy resolution (~100 keV) and, for the first time ever, time resolution (~20 ps). Crucial to the design of the system is a CD conversion foil for the production of recoil deuterons positioned as close to the implosion as possible. The foil-on-hohlraum technique has been demonstrated by placing a 1-mm-diameter, 40-μm-thick CD foil on the hohlraum diagnostic band along the line-of-sight of the current time-integrated MRS system, which measured the recoil deuterons. In addition to providing validation of the foil-on-hohlraum technique for the MRSt design, substantial improvement of the MRS energy resolution was demonstrated.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [2];  [2];  [4];  [5];  [3];  [1];  [2];  [2]; ORCiD logo [3];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. General Atomics, San Diego, CA (United States)
  4. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  5. General Atomics, La Jolla, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1545522
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 11; 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

Citation Formats

Parker, C. E., Frenje, J. A., Johnson, M. Gatu, Schlossberg, D. J., Reynolds, H. G., Hopkins, L. Berzak, Bionta, R., Casey, D. T., Felker, S. J., Hilsabeck, T. J., Kilkenny, J. D., Li, C. K., Mackinnon, A. J., Robey, H., Schoff, M. E., Séguin, F. H., Wink, C. W., and Petrasso, R. D. Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility. United States: N. p., 2018. Web. doi:10.1063/1.5052184.
Parker, C. E., Frenje, J. A., Johnson, M. Gatu, Schlossberg, D. J., Reynolds, H. G., Hopkins, L. Berzak, Bionta, R., Casey, D. T., Felker, S. J., Hilsabeck, T. J., Kilkenny, J. D., Li, C. K., Mackinnon, A. J., Robey, H., Schoff, M. E., Séguin, F. H., Wink, C. W., & Petrasso, R. D. Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility. United States. doi:10.1063/1.5052184.
Parker, C. E., Frenje, J. A., Johnson, M. Gatu, Schlossberg, D. J., Reynolds, H. G., Hopkins, L. Berzak, Bionta, R., Casey, D. T., Felker, S. J., Hilsabeck, T. J., Kilkenny, J. D., Li, C. K., Mackinnon, A. J., Robey, H., Schoff, M. E., Séguin, F. H., Wink, C. W., and Petrasso, R. D. Tue . "Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility". United States. doi:10.1063/1.5052184.
@article{osti_1545522,
title = {Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility},
author = {Parker, C. E. and Frenje, J. A. and Johnson, M. Gatu and Schlossberg, D. J. and Reynolds, H. G. and Hopkins, L. Berzak and Bionta, R. and Casey, D. T. and Felker, S. J. and Hilsabeck, T. J. and Kilkenny, J. D. and Li, C. K. and Mackinnon, A. J. and Robey, H. and Schoff, M. E. and Séguin, F. H. and Wink, C. W. and Petrasso, R. D.},
abstractNote = {The next-generation Magnetic Recoil Spectrometer, called MRSt, will provide time-resolved measurements of the deuterium-tritium-neutron spectrum from inertial confinement fusion implosions at the National Ignition Facility. These measurements will provide critical information about the time evolution of the fuel assembly, hot-spot formation, and nuclear burn. The absolute neutron spectrum in the energy range of 12-16 MeV will be measured with high accuracy (~5%), unprecedented energy resolution (~100 keV) and, for the first time ever, time resolution (~20 ps). Crucial to the design of the system is a CD conversion foil for the production of recoil deuterons positioned as close to the implosion as possible. The foil-on-hohlraum technique has been demonstrated by placing a 1-mm-diameter, 40-μm-thick CD foil on the hohlraum diagnostic band along the line-of-sight of the current time-integrated MRS system, which measured the recoil deuterons. In addition to providing validation of the foil-on-hohlraum technique for the MRSt design, substantial improvement of the MRS energy resolution was demonstrated.},
doi = {10.1063/1.5052184},
journal = {Review of Scientific Instruments},
number = 11,
volume = 89,
place = {United States},
year = {2018},
month = {11}
}

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This content will become publicly available on November 20, 2019
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