The high-flux backscattering spectrometer at the NIST Center for Neutron Research

被引:268
作者
Meyer, A
Dimeo, RM
Gehring, PM
Neumann, DA
机构
[1] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[2] Univ Maryland, Dept Mat & Nucl Engn, College Pk, MD 20742 USA
关键词
D O I
10.1063/1.1568557
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We describe the design and current performance of the high-flux backscattering spectrometer located at the NIST Center for Neutron Research. The design incorporates several state-of-the-art neutron optical devices to achieve the highest flux on sample possible while maintaining an energy resolution of less than 1 mueV. Foremost among these is a novel phase-space transformation chopper that significantly reduces the mismatch between the beam divergences of the primary and secondary parts of the instrument. This resolves a long-standing problem of backscattering spectrometers, and produces a relative gain in neutron flux of 4.2. A high-speed Doppler-driven monochromator system has been built that is capable of achieving energy transfers of up to +/-50 mueV, thereby extending the dynamic range of this type of spectrometer by more than a factor of 2 over that of other reactor-based backscattering instruments. (C) 2003 American Institute of Physics.
引用
收藏
页码:2759 / 2777
页数:19
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