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Title: The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF)

Abstract

The next-generation magnetic recoil spectrometer for time-resolved measurements of the neutron spectrum has been conceptually designed for the National Ignition Facility. This spectrometer, called MRSt, represents a paradigm shift in our thinking about neutron spectrometry for inertial confinement fusion applications, as it will provide simultaneously information about the burn history and time evolution of areal density (ρR), apparent ion temperature (T i), yield (Y n), and macroscopic flows during burn. From this type of data, an assessment of the evolution of the fuel assembly, hotspot, and alpha heating can be made. According to simulations, the MRSt will provide accurate data with a time resolution of ~20 ps and energy resolution of ~100 keV for total neutron yields above ~10 16. Lastly, at lower yields, the diagnostic will be operated at a higher-efficiency, lower-energy-resolution mode to provide a time resolution of ~20 ps.

Authors:
ORCiD logo [1];  [2];  [1];  [3];  [3]; ORCiD logo [3];  [1];  [2];  [1];  [1]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center. HEDP Div.; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1285117
Alternate Identifier(s):
OSTI ID: 1497273
Report Number(s):
LLNL-JRNL-750650
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:  
NA0002949; NA0001857; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: 21. Topical Conference on High Temperature Plasma Diagnostics (HTPD 2016) , Madison, WI (United States), 5-9 Jun 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Neutrons; Protons; MRSt

Citation Formats

Frenje, J. A., Hilsabeck, T. J., Wink, C. W., Bell, P., Bionta, R., Cerjan, C., Gatu Johnson, M., Kilkenny, J. D., Li, C. K., Séguin, F. H., and Petrasso, R. D. The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF). United States: N. p., 2016. Web. doi:10.1063/1.4959164.
Frenje, J. A., Hilsabeck, T. J., Wink, C. W., Bell, P., Bionta, R., Cerjan, C., Gatu Johnson, M., Kilkenny, J. D., Li, C. K., Séguin, F. H., & Petrasso, R. D. The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF). United States. doi:10.1063/1.4959164.
Frenje, J. A., Hilsabeck, T. J., Wink, C. W., Bell, P., Bionta, R., Cerjan, C., Gatu Johnson, M., Kilkenny, J. D., Li, C. K., Séguin, F. H., and Petrasso, R. D. Tue . "The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF)". United States. doi:10.1063/1.4959164. https://www.osti.gov/servlets/purl/1285117.
@article{osti_1285117,
title = {The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF)},
author = {Frenje, J. A. and Hilsabeck, T. J. and Wink, C. W. and Bell, P. and Bionta, R. and Cerjan, C. and Gatu Johnson, M. and Kilkenny, J. D. and Li, C. K. and Séguin, F. H. and Petrasso, R. D.},
abstractNote = {The next-generation magnetic recoil spectrometer for time-resolved measurements of the neutron spectrum has been conceptually designed for the National Ignition Facility. This spectrometer, called MRSt, represents a paradigm shift in our thinking about neutron spectrometry for inertial confinement fusion applications, as it will provide simultaneously information about the burn history and time evolution of areal density (ρR), apparent ion temperature (Ti), yield (Yn), and macroscopic flows during burn. From this type of data, an assessment of the evolution of the fuel assembly, hotspot, and alpha heating can be made. According to simulations, the MRSt will provide accurate data with a time resolution of ~20 ps and energy resolution of ~100 keV for total neutron yields above ~1016. Lastly, at lower yields, the diagnostic will be operated at a higher-efficiency, lower-energy-resolution mode to provide a time resolution of ~20 ps.},
doi = {10.1063/1.4959164},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: Post-shot simulations of ρR(t), Yn(t) and Ti(t) for shot N130927 with (a) no alpha heating included in the simulation, (b) with alpha heating artificially enhanced 4× relative to the experimentally inferred value, and (c) with alpha heating artificially enhanced 83×, which is enough heating for the implosion tomore » ignite. As discussed in detail in the text, the relative timing and evolution of these implosion parameters change with changing level of alpha heating.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.