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Title: Sensitivity of chemical vapor deposition diamonds to DD and DT neutrons at OMEGA and the National Ignition Facility

Abstract

The particle-time-of-flight (pTOF) detector at the National Ignition Facility (NIF) is used routinely to measure nuclear bang-times in inertial confinement fusion implosions. The active detector medium in pTOF is a chemical vapor deposition diamond. Calibration of the detectors sensitivity to neutrons and protons would allow measurement of nuclear bang times and hot spot areal density (ρR) on a single diagnostic. This study utilizes data collected at both NIF and Omega in an attempt to determine pTOF’s absolute sensitivity to neutrons. At Omega pTOF’s sensitivity to DT-n is found to be stable to within 8% at different bias voltages. At the NIF pTOF’s sensitivity to DD-n varies by up to 59%. This variability must be decreased substantially for pTOF to function as a neutron yield detector at the NIF. As a result, some possible causes of this variability are ruled out.

Authors:
 [1]; ORCiD logo [1];  [2];  [1]; ORCiD logo [3]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [2];  [2]; ORCiD logo [3]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of Rochester, Rochester, NY (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center, High Energy Density Physics Div.; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1312799
Alternate Identifier(s):
OSTI ID: 1374522
Report Number(s):
LLNL-JRNL-733850
Journal ID: ISSN 0034-6748; RSINAK; TRN: US1700090
Grant/Contract Number:  
NA0002949; NA0001857; NA0002726; AC52-07NA27344; FG52-09NA29553
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: 21. Topical Conference on High Temperature Plasma Diagnostics (HTPD 2016), Madison, WI (United States), 5-9 Jun 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; diamond; X-ray detectors; neutrons; chemical vapor deposition; inertial confinement

Citation Formats

Kabadi, N. V., Sio, H., Glebov, V., Gatu Johnson, M., MacPhee, A., Frenje, J. A., Li, C. K., Seguin, F., Petrasso, R., Forrest, C., Knauer, J., and Rinderknecht, H. G. Sensitivity of chemical vapor deposition diamonds to DD and DT neutrons at OMEGA and the National Ignition Facility. United States: N. p., 2016. Web. doi:10.1063/1.4960071.
Kabadi, N. V., Sio, H., Glebov, V., Gatu Johnson, M., MacPhee, A., Frenje, J. A., Li, C. K., Seguin, F., Petrasso, R., Forrest, C., Knauer, J., & Rinderknecht, H. G. Sensitivity of chemical vapor deposition diamonds to DD and DT neutrons at OMEGA and the National Ignition Facility. United States. doi:10.1063/1.4960071.
Kabadi, N. V., Sio, H., Glebov, V., Gatu Johnson, M., MacPhee, A., Frenje, J. A., Li, C. K., Seguin, F., Petrasso, R., Forrest, C., Knauer, J., and Rinderknecht, H. G. Tue . "Sensitivity of chemical vapor deposition diamonds to DD and DT neutrons at OMEGA and the National Ignition Facility". United States. doi:10.1063/1.4960071. https://www.osti.gov/servlets/purl/1312799.
@article{osti_1312799,
title = {Sensitivity of chemical vapor deposition diamonds to DD and DT neutrons at OMEGA and the National Ignition Facility},
author = {Kabadi, N. V. and Sio, H. and Glebov, V. and Gatu Johnson, M. and MacPhee, A. and Frenje, J. A. and Li, C. K. and Seguin, F. and Petrasso, R. and Forrest, C. and Knauer, J. and Rinderknecht, H. G.},
abstractNote = {The particle-time-of-flight (pTOF) detector at the National Ignition Facility (NIF) is used routinely to measure nuclear bang-times in inertial confinement fusion implosions. The active detector medium in pTOF is a chemical vapor deposition diamond. Calibration of the detectors sensitivity to neutrons and protons would allow measurement of nuclear bang times and hot spot areal density (ρR) on a single diagnostic. This study utilizes data collected at both NIF and Omega in an attempt to determine pTOF’s absolute sensitivity to neutrons. At Omega pTOF’s sensitivity to DT-n is found to be stable to within 8% at different bias voltages. At the NIF pTOF’s sensitivity to DD-n varies by up to 59%. This variability must be decreased substantially for pTOF to function as a neutron yield detector at the NIF. As a result, some possible causes of this variability are ruled out.},
doi = {10.1063/1.4960071},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {8}
}

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