Page 110 - Neutrons for Sciences and Society

Neutrons for Science
1. Diffractometers for powder samples
• A combination of two diffractometers, D1A and D1B, to be installed on a thermal neutron guide and using the beams of neutrons diffracted by different planes of the same monochromator crystal. One, D1A was designed for high resolution work, the other, D1B used a multi-detector for fast data acquisition. These instruments were installed by Paul Burlet76, coming from the CENG, and recruited by the ILL in October 1970.
• An instrument for measuring magnetic structures, D2, constructed by the CENG to be placed on the H11 beam tube also by Paul Burlet
2. Diffractometers for single crystal measurements
• The D8 diffractometer, also placed on the H11 beam tube was a conventional 4-circle instrument installed by Alain Filhol coming from the crystallography laboratory of Robert Gay in Bordeaux and Michel Thomas.
• The D6 diffractometer, christened “Igel” (hedgehog) which allowed the simultaneous measurement of multiple reflections from the sample crystal (Fig. 5.2). This was achieved using 100 moveable detectors mounted on
a spherical shell about the sample. This instrument, conceived at the ILL to study the structure of proteins was built by Bertram Klar for his thesis. It never worked completely satisfactorily partly because its mechanics and electronics were too complex for its time. Today multi-
76 2018 addition: it is fair to say that Edouard Roudaut (CEA-CENG) and then his thesis student Pierre Convert did a large part of the design and installation work, especially for D1B and its multi-detector.
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