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OrientExpress

An automatic Laue neutron-diffractometer based upon two high-performance image-intensified CCD cameras coupled to a large-area neutron scintillator. It allows electronic capture of neutron Laue diffraction patterns in a very short time (few seconds). A gain of about 100 in efficiency is obtained compared to the conventional film method with comparable spatial resolution.

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OrientExpress - Characteristics

Guide hall 1, End of the thermal neutron guide H24


Diffraction geometry

Transmission or backscattering

Neutron beam

Flux at sample position

about 107 n/cm2/s

Wavelength range

0.8 - 3.2 Å

Detector (1)

2 CCD cameras

High performance thermoelectrically cooled image intensified CCD cameras

Scintillator

AST type ND blue, based upon 6Li with added ZnS:Ag
Thickness: 0.45 mm
Total active area: 252 x 198 mm2
Each pixel is 150 µm on edge

Coupling between both

Via a tapered fibre-optic, bonded directly onto the CCD, to give maximum transmission and high sensitivity

Tools

Video system for crystal positioning
Sample transfer device


(1) Photonics Science Limited, Robertsbridge, East Sussex, TN32 3LA, United Kingdom.

Ref.: "OrientExpress: A new system for Laue neutron diffraction ", Ouladdiaf B. , Archer J. , McIntyre G.J. , Hewat A.W. , Brau D. , York S., Physica B 385-386, 1052-1054 (2006).