Using multiple neutron time of flight detectors to determine the hot spot velocity
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
An important diagnostic value of a shot at the National Ignition Facility is the resultant center-of-mass motion of the imploding capsule. This residual velocity reduces the efficiency of converting laser energy into plasma temperature. A new analysis method extracts the effective hot spot motion by using information from multiple neutron time-of-flight (nToF) lines-of-sight (LoSs). This technique fits a near Gaussian spectrum to the nToF scope traces and overcomes reliance on models to relate the plasma temperature to the mean energy of the emitted neutrons. This method requires having at least four nToF LoSs. The results of this analysis will be compared to an approach where each LoS is analyzed separately and a model is employed to infer the mean energy of the emitted neutrons
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1545515
- Alternate ID(s):
- OSTI ID: 1477910
- Journal Information:
- Review of Scientific Instruments, Vol. 89, Issue 10; Conference: 22. Topical Conference on High-Temperature Plasma Diagnostics, San Diego, CA (United States), Apr. 2018; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Velocity correction for neutron activation diagnostics at the NIF
|
journal | October 2018 |
A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)
|
journal | October 2018 |
Neutron backscatter edge: A measure of the hydrodynamic properties of the dense DT fuel at stagnation in ICF experiments
|
journal | January 2020 |
Similar Records
An Evaluation of Bang-Time Measurements from a Multichannel, Triaxial, nTOF Diagnostic for MagLIF Experiments at the Z facility
View factor estimation of hot spot velocities in inertial confinement fusion implosions at the National Ignition Facility