Constraining time-dependent ion temperature measurements in inertial confinement fusion (ICF) implosions with an intermediate distance neutron time-of-flight (nToF) detector

A S Moore; D J Schlossberg; M J Eckart; E P Hartouni; T J Hilsabeck; J S Jeet; S M Kerr; R C Nora; J Kilkenny

doi:10.1063/5.0099933

Constraining time-dependent ion temperature measurements in inertial confinement fusion (ICF) implosions with an intermediate distance neutron time-of-flight (nToF) detector

Rev Sci Instrum. 2022 Nov 1;93(11):113536. doi: 10.1063/5.0099933.

Authors

A S Moore¹, D J Schlossberg¹, M J Eckart¹, E P Hartouni¹, T J Hilsabeck¹, J S Jeet¹, S M Kerr¹, R C Nora¹, J Kilkenny²

Affiliations

¹ Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA.
² General Atomics, San Diego, California 92121, USA.

PMID: 36461534
DOI: 10.1063/5.0099933

Abstract

A concept for using an intermediate distance (0.3-3.0 m) neutron time-of-flight (nToF) to provide a constraint on the measurement of the time-dependence of ion temperature in inertial confinement fusion implosions is presented. Simulated nToF signals at different distances are generated and, with a priori knowledge of the burn-averaged quantities and burn history, analyzed to determine requirements for a future detector. Results indicate a signal-to-noise ratio >50 and time resolution <20 ps to constrain the ion temperature gradient to ∼±25% (0.5 keV/100 ps).