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

C. E. Parker | Zendy; J. A. Frenje | Zendy; M. Gatu Johnson | Zendy; D. J. Schlossberg | Zendy; H. Reynolds | Zendy; L. Berzak Hopkins | Zendy; R. M. Bionta | Zendy; D. T. Casey | Zendy; S. Felker | Zendy; T. J. Hilsabeck | Zendy; J. D. Kilkenny | Zendy; C K Li | Zendy; A. J. Mackin | Zendy; H. F. Robey | Zendy; M. Schoff | Zendy; F. H. Séguin | Zendy; C. W. Wink | Zendy; R. D. Petrasso | Zendy

Open Access

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

Author(s) -

C. E. Parker,

J. A. Frenje,

M. Gatu Johnson,

D. J. Schlossberg,

H. Reynolds,

L. Berzak Hopkins,

R. M. Bionta,

D. T. Casey,

S. Felker,

T. J. Hilsabeck,

J. D. Kilkenny,

C K Li,

A. J. Mackin,

H. F. Robey,

M. Schoff,

F. H. Séguin,

C. W. Wink,

R. D. Petrasso

Publication year - 2018

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.5052184

Subject(s) - hohlraum , national ignition facility , implosion , inertial confinement fusion , recoil , neutron , spectrometer , nuclear physics , foil method , physics , deuterium , z pinch , plasma diagnostics , materials science , atomic physics , optics , plasma , composite material

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-m-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.

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