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D20 - 1D multidetector

A series of short movies showing how neutron experiments are prepared or performed. Some of these movies have an historical interest since they captured important moments in the life of the ILL.

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Films and animations


Construction of a large one-dimensional multidetector

D20 is a very high intensity neutron 2-axis diffractometer equipped with a large micro-strip detector. Due to the extremely high neutron flux, it opens up new possibilities for real-time experiments on very small samples.

The movie below was recorded in 2000. It shows the construction of the large one-dimensional multidetector.
This position sensitive detector (PSD) is based on the micro-strip gas chamber (MSGC) technology, i.e. the delicate streched wires of classic gas multidetectors are replaced by metallic strips engraved on a special glass substratum. Its advantages are a very homogeneous response, a very high stability and the possibility of very high counting rates.
Micro-strip plates are made of chromium sputtered onto the polished surface of an electronically conducting glass. The chromium is etched to create conductive micro-strip electrodes (alternately 4 cathodes and 4 thin anodes per detection cell). The detection plates have each 32 cells of 2.568 mm (0.1˚) each, covering in total 3.2˚. The current PSD covers 153.6˚, with 48 plates mounted in a curved aluminium housing providing a detection zone about 4 m long by 150 mm high.

Ref. for D20:
  - Hansen T.C, Henry P.F., Fischer H.F., Torregrossa J., Convert P. (2007) Measurement Science and Technology, 19, 034001-1-034001-6 (2008).
  - Convert P et al. (1997) Physica B, 234-236, 1082-83.
Ref. for the microstrip invention:
  - Oed A. (1988) Nucl. Instrum. Methods A, 263, 351-359.

Movie by Alain Filhol.

©2000-2007, Institut Laue-Langevin, Grenoble, France.

Movie files (320x240 fixels, 31"): .mp4 (0.9 Mb), .webm (4.5 Mb), .flv (1.2 Mb).

English checked by: Ronen Ghosh, April 2007.
Updates: A.Filhol, 23 April 2007, 8 Sept 2009, 18 April 2012.

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