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The National Ignition Facility neutron time-of-flight system and its initial performance (invited)
V Yu Glebov1, T C Sangster, C Stoeckl
1Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA. vgle@lle.rochester.edu
The Review of Scientific Instruments
|November 2, 2010
Summary
The National Ignition Facility
Area of Science:
- Nuclear Fusion Science
- Plasma Physics
- High-Energy-Density Physics
Background:
- The National Ignition Facility (NIF) conducted its inaugural inertial confinement fusion (ICF) campaign in 2009.
- Nuclear diagnostics, including a neutron time-of-flight (nTOF) system, were integral to this campaign.
- The nTOF technique is a long-established method for inferring ion temperature and neutron yield in ICF experiments.
Purpose of the Study:
- To implement and utilize a neutron time-of-flight (nTOF) system for nuclear diagnostics during NIF's first ICF campaign.
- To measure key plasma parameters such as neutron yield, ion temperature, and areal density.
- To validate the nTOF system's performance and calibration at NIF.
Main Methods:
- Deployment of three highly sensitive neutron time-of-flight detectors.
- Measurement of neutron temporal Doppler broadening to determine ion temperature.
- Calibration of detectors using data from the OMEGA facility and application to NIF experiments.
Main Results:
- Successful measurement of primary neutron yield and ion temperature for 25 deuterium-tritium (D(2)) fuel implosions.
- Demonstration of the nTOF system's capability to measure neutron yield and ion temperature across a wide dynamic range.
- Validation of the OMEGA yield calibration transfer to the NIF.
Conclusions:
- The nTOF system was successfully commissioned and operated during NIF's 2009 ICF campaign.
- The system provided accurate measurements of neutron yield and ion temperature, crucial for understanding fusion performance.
- The successful calibration transfer underscores the reliability of nTOF diagnostics for ICF research.
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