The D20 instrument at the ILL: a versatile high-intensity two-axis neutron diffractometer

被引：217
|
作者：
Hansen, Thomas C. [1 ]
Henry, Paul F. [1 ]
Fischer, Henry E. [1 ]
Torregrossa, Jacques [1 ]
Convert, Pierre [1 ]
机构：
[1] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
来源：
MEASUREMENT SCIENCE AND TECHNOLOGY | 2008年 / 19卷 / 03期
关键词：
neutron instrumentation; neutron diffraction; powder diffraction; monochromator; position sensitive detector; microstrip detector;
D O I：
10.1088/0957-0233/19/3/034001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
D20 is a medium to high resolution two-axis diffractometer capable of producing a neutron flux of 10(8) s(-1) cm(-2) at the sample position. The 1536 detection cells of its curved linear position sensitive detector (PSD) cover a continuous 2 theta. range of 153.6 degrees. over a total solid angle of 0.27 sr. This combination of a high incident neutron flux and a large detector solid angle provides D20 with the fastest counting rate, at a given resolution, of any reactor-based neutron diffractometer. Different monochromators and take-off angles, plus optional Soller collimators and secondary slits, permit a wide choice in the Q-space range, wavelength, resolution and flux. A high-resolution configuration offers Delta d/d similar to 2 x 10(-3). Fast modern counting electronics allow in situ time-resolved experiments at the timescale of a few tens of milliseconds. In addition, a variety of sample environments, including an optional radial oscillating collimator for suppressing parasitic scattering, contribute to a rich scientific programme.
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页数：6
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