Diagnosing inertial confinement fusion gamma ray physics (invited) |
| |
Authors: | Herrmann H W Hoffman N Wilson D C Stoeffl W Dauffy L Kim Y H McEvoy A Young C S Mack J M Horsfield C J Rubery M Miller E K Ali Z A |
| |
Affiliation: | Los Alamos National Laboratory, P.O. Box 1663, M/S E526, Los Alamos, New Mexico 87545, USA. herrmann@lanl.gov |
| |
Abstract: | The gamma reaction history (GRH) diagnostic is a multichannel, time-resolved, energy-thresholded γ-ray spectrometer that provides a high-bandwidth, direct-measurement of fusion reaction history in inertial confinement fusion implosion experiments. 16.75 MeV deuterium+tritium (DT) fusion γ-rays, with a branching ratio of the order of 10(-5)γ/(14?MeV?n), are detected to determine fundamental burn parameters, such as nuclear bang time and burn width, critical to achieving ignition at the National Ignition Facility. During the tritium/hydrogen/deuterium ignition tuning campaign, an additional γ-ray line at 19.8 MeV, produced by hydrogen+tritium fusion with a branching ratio of unity, will increase the available γ-ray signal and may allow measurement of reacting fuel composition or ion temperature. Ablator areal density measurements with the GRH are also made possible by detection of 4.43 MeV γ-rays produced by inelastic scatter of DT fusion neutrons on (12)C nuclei in the ablating plastic capsule material. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|