Absolute calibration of the JT-60U neutron monitor using a sup 252 Cf neutron source (abstract)

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143666· OSTI ID:7009370

Nishitani, T; Takeuchi, H; Kondoh, T; Itoh, T; Kuriyama, M; Ikeda, Y ^[1]; Iguchi, T ^[2]; Barnes, C W ^[3]

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1. Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken 311-01 (Japan)
2. Department of Nuclear Engineering, Faculty of Engineering, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Absolutely calibrated measurements of the neutron yield are important for the evaluation of the plasma performance such as the fusion gain {ital Q} in D-D operating tokamaks. The time-resolved neutron yield is measured with {sup 235}U and {sup 238}U fission chambers and {sup 3}He proportional counters in the JT-60U tokamak. The {ital in} {ital situ} calibration was performed by moving the {sup 252}Cf neutron source toroidally through the JT-60 vacuum vessel. Detection efficiencies of three {sup 235}U and two {sup 3}He detectors were measured for 92 locations of the neutron point source in toroidal scans at two different major radii. The total detection efficiency for the torus neutron source was obtained by the averaging the point efficiencies over the whole toroidal angle. The uncertainty of the resulting detection efficiency for the plasma neutrons is estimated to be {plus minus}11%.

• OSTI ID: 7009370
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:10; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CALIBRATION
CALIFORNIUM 252
CALIFORNIUM ISOTOPES
CLOSED PLASMA DEVICES
EFFICIENCY
EVEN-EVEN NUCLEI
FISSION CHAMBERS
HE-3 COUNTERS
HEAVY NUCLEI
IONIZATION CHAMBERS
ISOTOPES
JT-60 TOKAMAK
MEASURING INSTRUMENTS
MONITORS
NEUTRON DETECTORS
NEUTRON MONITORS
NEUTRON SOURCES
NUCLEI
PARTICLE SOURCES
PLASMA DIAGNOSTICS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RADIATION MONITORS
RADIATION SOURCES
RADIOISOTOPES
SPONTANEOUS FISSION RADIOISOTOPES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
YEARS LIVING RADIOISOTOPES