A large 2D PSD for thermal neutron detection
- Australian Nuclear Science and Technology Organization, Menai, New South Wales (Australia). Physics Div.
- Brookhaven National Lab., Upton, NY (United States). Instrumentation Div.
A 2D PSD based on a MWPC has been constructed for a small angle neutron scattering instrument. The active area of the detector was 640 x 640 mm{sup 2}. To meet the specifications for neutron detection efficiency and spatial resolution, and to minimize parallax, the gas mixture was 190 kPa {sup 3}He plus 100 kPa CF{sub 4} and the active volume had a thickness of 30 mm. The design maximum neutron count-rate of the detector was 10{sup 5} events per second. The (calculated) neutron detection efficiency was 60% for 2{angstrom} neutrons and the (measured) neutron energy resolution on the anode grid was typically 20% (fwhm). The location of a neutron detection event within the active area was determined using the wire-by-wire method: the spatial resolution (5 x 5 mm{sup 2}) was thereby defined by the wire geometry. A 16 channel charge-sensitive preamplifier/amplifier/comparator module has been developed with a channel sensitivity of 0.1 V/fC, noise linewidth of 0.4 fC (fwhm) and channel-to-channel cross-talk of less than 5%. The Proportional Counter Operating System (PCOS III) (LeCroy Corp USA) was used for event encoding. The ECL signals produced by the 16 channel modules were latched in PCOS III by a trigger pulse from the anode and the fast encoders produce a position and width for each event. The information was transferred to a UNIX workstation for accumulation and online display.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); Australian Research Council, Canberra, ACT (Australia)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 432975
- Report Number(s):
- BNL-63800; CONF-9609106-2; ON: DE97002901; TRN: 98:008318
- Resource Relation:
- Conference: 4. international conference on positron-sensitive detectors, Manchester (United Kingdom), 9-13 Sep 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
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