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

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/1.4960071· OSTI ID:1312799
 [1];  [2];  [3];  [2];  [4];  [2];  [2];  [2];  [2];  [3];  [3];  [4]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); HEDP DIVISION, MIT PLASMA SCIENCE AND FUSION CENTER
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of Rochester, Rochester, NY (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
+ Show Author Affiliations

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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center, HEDP Division
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002949; NA0001857; NA0002726
OSTI ID:
1312799
Alternate ID(s):
OSTI ID: 1374522
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (10)

CVD diamond as a high bandwidth neutron detector for inertial confinement fusion diagnostics journal March 2003
A novel particle time of flight diagnostic for measurements of shock- and compression-bang times in D 3 He and DT implosions at the NIF journal October 2012
Progress towards ignition on the National Ignition Facility journal July 2013
Review of the National Ignition Campaign 2009-2012 journal February 2014
A magnetic particle time-of-flight (MagPTOF) diagnostic for measurements of shock- and compression-bang time at the NIF (invited) journal November 2014
A compact proton spectrometer for measurement of the absolute DD proton spectrum from which yield and ρR are determined in thin-shell inertial-confinement-fusion implosions journal October 2014
Polar-direct-drive experiments on the National Ignition Facilitya) journal May 2015
Using multiple secondary fusion products to evaluate fuel ρR, electron temperature, and mix in deuterium-filled implosions at the NIF journal August 2015
Note: A monoenergetic proton backlighter for the National Ignition Facility journal November 2015
The Physics of Inertial Fusion book January 2004

Cited By (1)

Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas journal January 2020

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
X-ray detectors
chemical vapor deposition
diamond
inertial confinement
neutrons