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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

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  • Media type: E-Article
  • Title: Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility
  • Contributor: 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.
  • imprint: AIP Publishing, 2018
  • Published in: Review of Scientific Instruments
  • Language: English
  • DOI: 10.1063/1.5052184
  • ISSN: 0034-6748; 1089-7623
  • Keywords: Instrumentation
  • Origination:
  • Footnote:
  • Description: <jats:p>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 has been demonstrated.</jats:p>