Open AccessMeasurements of collective fuel velocities in deuterium-tritium exploding pusher and cryogenically layered deuterium-tritium implosions on the NIF
Author(s) -
M. Gatu Johnson,
D. T. Casey,
J. A. Frenje,
C.-K. Li,
F.H. Séguin,
R. D. Petrasso,
R. Ashabranner,
R. M. Bionta,
S. Le Pape,
M. A. McKernan,
A. J. Mackin,
J. D. Kilkenny,
J. P. Knauer,
T. C. Sangster
Publication year - 2013
Publication title -
physics of plasmas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.75
H-Index - 160
eISSN - 1089-7674
pISSN - 1070-664X
DOI - 10.1063/1.4802810
Subject(s) - national ignition facility , physics , nuclear physics , tritium , inertial confinement fusion , deuterium , neutron , plasma diagnostics , plasma , atomic physics
For the first time, quantitative measurements of collective fuel velocities in Inertial Confinement Fusion implosions at the National Ignition Facility are reported. Velocities along the line-of-sight (LOS) of the Magnetic Recoil neutron Spectrometer (MRS), positioned close to the equator (73°–324°), were inferred from the measured mean energy of the deuterium-tritium (DT)-primary neutron peak. Substantial mean energy shifts up to 113 ± 16 keV were observed in DT gas-filled exploding-pusher implosions, driven in a polar-direct drive configuration, which corresponds to bulk fuel velocities up to 210 ± 30 km/s. In contrast, only marginal bulk fuel velocities along the MRS LOS were observed in cryogenically layered DT implosions. Integrated analysis of data from a large number of cryogenically layered implosions has recently identified a deficit in achieved hot-spot energy of ∼3 kJ for these implosions [C. Cerjan et al., Phys. Plasmas (2013)]. One hypothesis that could explain this missing energy is a collec...
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