College Park, Maryland June 6 - 10 , 2004
TP30: New Thermal Triple Axis Spectrometers at the NCNR
M. Murbach, C. Wrenn, C. Brocker (NIST Center for Neutron Research; Department of Materials Science and Engineering, University of Maryland), P. Brand, J. W. Lynn (NIST Center for Neutron Research)
As part of the modernization of the thermal neutron spectrometers, and new state-of-the-art thermal neutron instrument is now being installed at the BT-7 thermal beam port. There is a choice of filters and collimations in the reactor beam that bring neutrons onto a choice of 20×20 cm2 double focusing monochromators. The sample stage incorporates a independent magnet axis in addition to the usual motorized sample orientation and rotation angles. The analyzer and detector system will be housed in a single unit on air pads. The analyzer will also provide horizontal focusing capability, or it can use a flat crystal array coupled with a position-sensitive detector to allow the simultaneous collection of data over a range of (Q,E), or it can use a choice of different conventional collimators, all remotely and under computer control. The analyzer/detector system is designed to be self-contained so that it can be easily interchanged with a different style of analyzer as new systems are developed. Guide fields are incorporated throughout the instrument to enable polarized beam operation. A similar spectrometer is being developed for the BT-9 beam port.
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