15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

7.3 A Quartz-based Cherenkov Radiator for High Precision Time-of-Flight Measurement of DT Fusion Gamma and Neutron Spectra

17 Apr 2018, 15:00
30m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Alastair Moore (LLNL) Daniel Sayre (LLNL) David Schlossberg (LLNL) Edward Hartouni (LLNL) Robert Hatarik (LLNL) Gary Grim (LLNL) Mark Eckart (LLNL) Jaben Root (LLNL) Cory Waltz (LLNL) Bart Beeman (LLNL) Francisco Barbosa (LLNL) Michael Rubery (LLNL)

Description

A quartz based Cherenkov radiator has been implemented at the National Ignition Facility (NIF) to provide a new high precision measurement of the spectrum of 14.1 MeV DT fusion neutrons. This detector has two benefits over traditional scintillator-based nToFs. (1) it enables a high precision (<50ps) co-registered measurement of both a thresholded gamma spectrum and the neutron spectrum on a single record; other methods typically require gamma and neutron signals to be co-registered via other diagnostics and/or dedicated timing experiments. (2) the temporal width of the instrument response function (IRF) is reduced to < 1.0ns thereby reducing the uncertainty in the Brysk ion temperature derived from the width of the measured neutron spectrum. Analysis of co-registered gamma and neutron data from NIF DT implosions on multiple lines-of-sight indicate that the bulk vector velocity of the implosion hot-spot can be determined to within 5 km/s, while analysis of the neutron spectrum indicates the uncertainty in the ion temperature due to the IRF is reduced to approx. 0.1keV. LLNL-ABS-744335 This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.

Primary author

Alastair Moore (LLNL)

Co-authors

Daniel Sayre (LLNL) David Schlossberg (LLNL) Edward Hartouni (LLNL) Robert Hatarik (LLNL) Gary Grim (LLNL) Mark Eckart (LLNL) Jaben Root (LLNL) Cory Waltz (LLNL) Bart Beeman (LLNL) Francisco Barbosa (LLNL) Michael Rubery (LLNL)

Presentation Materials

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