Neutron time-of-flight ion temperature diagnostic for inertial-confinement-fusion experiments

We are constructing a {ital T}{sub {ital i}} diagnostic for low neutron yield (5{times}10{sup 7} to above 10{sup 9}) {ital d}-{ital d} and {ital d}-{ital t} targets in the Nova facility at Livermore. The diagnostic measures the neutron energy spread with 960 scintillator-photomultiplier detectors lo...

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Bibliographic Details
Published in:Review of scientific instruments 1992-10, Vol.63:10
Main Authors: Chrien, R.E., Simmons, D.F., Holmberg, D.L.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320 - Plasma Diagnostic Techniques & Instrumentation- (1992-)
DESIGN
LASL
MEASURING INSTRUMENTS
NATIONAL ORGANIZATIONS
NEUTRON DETECTORS
NOVA FACILITY
PHOTOMULTIPLIERS
PHOTOTUBES
PLASMA DIAGNOSTICS
RADIATION DETECTORS
RESOLUTION
SCINTILLATION COUNTERS
SCINTILLATOR-PHOTODIODE DETECTORS
TIME-OF-FLIGHT METHOD
US AEC
US DOE
US ERDA
US ORGANIZATIONS
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Summary:We are constructing a {ital T}{sub {ital i}} diagnostic for low neutron yield (5{times}10{sup 7} to above 10{sup 9}) {ital d}-{ital d} and {ital d}-{ital t} targets in the Nova facility at Livermore. The diagnostic measures the neutron energy spread with 960 scintillator-photomultiplier detectors located 28 m from the target and operates in the single-hit mode. Each detector can measure a single neutron arrival with time resolution of 1 ns or better. The arrival time distribution is constructed from the results of typically 200--500 detector measurements. The ion temperature is determined from the spread in neutron energy {Delta}{ital E}{sub {ital n}}{proportional to}{ital T}{sub {ital i}}{sup 1/2}, which is related to the arrival time spread by {Delta}{ital t}/{ital t}{congruent}{minus}(1/2){Delta}{ital E}{sub {ital n}}/{ital E}{sub {ital n}}. Each neutron arrival is detected by using a photomultiplier tube to observe the recoil proton from elastic scattering in a fast plastic scintillator. The timing electronics for each channel consist of a novel constant fraction-like discriminator and a multiple hit time-to-digital converter. The overall system design, together with single-channel performance data, is presented.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1143540