Absolute calibration of tokamak fusion test reactor neutron detectors for D-T plasma operation

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146196· OSTI ID:6690561

Jassby, D L; Barnes, C W; Johnson, L C; Roquemore, A L; Strachan, J D; Johnson, D W; Medley, S S; Young, K M ^[1]

---

1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

The two most sensitive TFTR fission-chamber detectors were absolutely calibrated [ital in] [ital situ] by a D-T neutron generator ([similar to]5[times]10[sup 7] n/s) rotated once around the torus in each direction, with data taken at about 45 positions. The combined uncertainty for determining fusion neutron rates, including the uncertainty in the total neutron generator output ([plus minus]9%), counting statistics, the effect of coil coolant, detector stability, cross calibration to the current mode or log Campbell mode and to other fission chambers, and plasma position variation, is about [plus minus]13%. The NE-451 (ZnS) scintillators and [sup 4]He proportional counters that view the plasma in up to 10 collimated sightlines were calibrated by scanning the neutron generator radially and toroidally in the horizontal midplane across the flight tubes of 7 cm diam. Spatial integration of the detector responses using the calibrated signal per unit chord-integrated neutron emission gives the global neutron source strength with an overall uncertainty of [plus minus]14% for the scintillators and [plus minus]15% for the [sup 4]He counters.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6690561
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 66:1; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
CALIBRATION
CLOSED PLASMA DEVICES
DESIGN
ERRORS
MEASURING INSTRUMENTS
NEUTRON DETECTORS
NEUTRON FLUX
PERFORMANCE
PLASMA DIAGNOSTICS
RADIATION DETECTORS
RADIATION FLUX
TFTR TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES