The coincidence counting technique for orders of magnitude background reduction in data obtained with the magnetic recoil spectrometer at OMEGA and the NIF
- Plasma Science and Fusion Center, MIT, Cambridge, Massachusetts 02139 (United States)
- Laboratory for Laser Energetics, UR, Rochester, New York 14623 (United States)
A magnetic recoil spectrometer (MRS) has been built and successfully used at OMEGA for measurements of down-scattered neutrons (DS-n), from which an areal density in both warm-capsule and cryogenic-DT implosions have been inferred. Another MRS is currently being commissioned on the National Ignition Facility (NIF) for diagnosing low-yield tritium-hydrogen-deuterium implosions and high-yield DT implosions. As CR-39 detectors are used in the MRS, the principal sources of background are neutron-induced tracks and intrinsic tracks (defects in the CR-39). The coincidence counting technique was developed to reduce these types of background tracks to the required level for the DS-n measurements at OMEGA and the NIF. Using this technique, it has been demonstrated that the number of background tracks is reduced by a couple of orders of magnitude, which exceeds the requirement for the DS-n measurements at both facilities.
- OSTI ID:
- 22075521
- Journal Information:
- Review of Scientific Instruments, Vol. 82, Issue 7; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Similar Records
The magnetic recoil spectrometer for measurements of the absolute neutron spectrum at OMEGA and the NIF
Application of the coincidence counting technique to DD neutron spectrometry data at the NIF, OMEGA, and Z