CVD Diamond Detectors for Current Mode Neutron Time-of-Flight Spectroscopy at OMEGA/NIF
We have performed pulsed neutron and pulsed laser tests of a CVD diamond detector manufactured from DIAFILM, a commercial grade of CVD diamond. The laser tests were performed at the short pulse UV laser at Bechtel Nevada in Livermore, CA. The pulsed neutrons were provided by DT capsule implosions at the OMEGA laser fusion facility in Rochester, NY. From these tests, we have determined the impulse response to be 250 ps fwhm for an applied E-field of 500 V/mm. Additionally, we have determined the sensitivity to be 2.4 mA/W at 500 V/mm and 4.0 mA/W at 1000 V/mm. These values are approximately 2 to 5x times higher than those reported for natural Type IIa diamond at similar E-field and thickness (1mm). These characteristics allow us to conceive of a neutron time-of-flight current mode spectrometer based on CVD diamond. Such an instrument would sit inside the laser fusion target chamber close to target chamber center (TCC), and would record neutron spectra fast enough such that backscattered neutrons and x-rays from the target chamber wall would not be a concern. The acquired neutron spectra could then be used to extract DD fuel areal density from the downscattered secondary to secondary ratio.
- Research Organization:
- Bechtel Nevada Corp. (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC08-96NV11718
- OSTI ID:
- 783912
- Report Number(s):
- DOE/NV/11718-590; W-7405-ENG-48; TRN: US0104108
- Resource Relation:
- Conference: SPIE's 46th Annual Meeting International Symposium on Optical Science and Technology, San Diego, CA (US), 07/29/2001--08/03/2001; Other Information: PBD: 1 Jul 2001
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DIAMONDS
CHEMICAL VAPOR DEPOSITION
RADIATION DETECTORS
PERFORMANCE TESTING
LASERS
TIME-OF-FLIGHT SPECTROMETERS
NEUTRON SPECTRA
TARGET CHAMBERS
OMEGA FACILITY
D-D REACTORS
CVD DIAMOND DETECTOR
NEUTRON SPECTROMETER
LASER FUSION DIAGNOSTIC
FUEL AREAL DENSITY