Hotspot electron temperature from x-ray continuum measurements on the NIF
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
We report on measurements of the electron temperature in the hotspot of inertially confined, layered, spherical implosions on the National Ignition Facility using a differential filtering diagnostic. Measurements of the DT and DD ion temperatures using neutron time-of-flight detectors are complicated by the contribution of hot spot motion to the peak width, which produce an apparent temperature higher than the thermal temperature. The electron temperature is not sensitive to this non-thermal velocity and is thus a valuable input to interpreting the stagnated hot spot conditions. Here we show that the current differential filtering diagnostic provides insufficient temperature resolution for the hot spot temperatures of interest. We then propose a new differential filter configuration utilizing larger pinhole size to increase spectral fluence, as well as thicker filtration. In conclusion, this new configuration will improve measurement uncertainty by more than a factor of three, allowing for a more accurate hotspot temperature.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1289377
- Report Number(s):
- LLNL-CONF-698884; RSINAK
- Journal Information:
- Review of Scientific Instruments, Vol. 87, Issue 11; Conference: Proceedings of the 21st Topical Conference on High-Temperature Plasma Diagnostics, Madison, WI (United States), 5-9 Jun 2016; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
The role of hot spot mix in the low-foot and high-foot implosions on the NIF
|
journal | May 2017 |
Synthetic nuclear diagnostics for inferring plasma properties of inertial confinement fusion implosions
|
journal | December 2018 |
Implementing time resolved electron temperature capability at the NIF using a streak camera
|
journal | October 2018 |
Ultrafast measurements of ion temperature in high-energy-density plasmas by nuclear resonance fluorescence
|
journal | June 2019 |
Similar Records
Using time-resolved penumbral imaging to measure low hot spot x-ray emission signals from capsule implosions at the National Ignition Facility
Imaging of High-Energy X-Ray Emission from Cryogenic Thermonuclear Fuel Implosions on the NIF