A new high resolution neutron powder diffractometer at the Brookhaven High Flux Beam Reactor

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5859286

Passell, L; Bar-Ziv, S; Gardner, D W; Cox, D E; Axe, J D

A high resolution neutron powder diffractometer under construction at the Brookhaven HFBR is expected to be completed by mid-1991. The new machine will have a Ge (511) monochromator with a take-off angle of 120{degree} ({lambda} = 1.89{angstrom}) and 64 {sup 3}He counters in the detector bank. There will be interchangeable collimators before the monochromator allowing a choice of 5 or 11 ft horizontal divergence, and 10 cm-high, 5 ft collimators in front of the detectors. In the higher resolution mode, {Delta}d/d is expected to be about 6 {times} 10{sup {minus}4} at the resolution minimum. The diffractometer is generally similar to D2B at the Institut Laue- Langevin except for the monochromator. This will consist of a vertically focussing array of segments 3 {times} 1.27 cm in dimensions cut from stacks of 20 0.43 mm wafers that have been pressed and brazed together. Preliminary measurements indicate that a mosaic width of 0.1--0.15{degree} and a peak reflectivity of 25% can be achieved in this way. 22 refs., 2 figs., 1 tab.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5859286
• Report Number(s): BNL-46082; CONF-9103168--1; ON: DE91012076
• Country of Publication: United States
• Language: English

Related Subjects

440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COLLIMATORS
CONSTRUCTION
DIFFRACTOMETERS
ENRICHED URANIUM REACTORS
HEAVY WATER COOLED REACTORS
HEAVY WATER MODERATED REACTORS
HFBR REACTOR
MEASURING INSTRUMENTS
MONOCHROMATORS
NEUTRON DIFFRACTOMETERS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
RESOLUTION
TANK TYPE REACTORS
THERMAL REACTORS