Upgrading of the SANS instrument D11 at the ILL

✍ Scribed by P. Lindner; R.P. May; P.A. Timmins

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 580 KB
• Volume: 180-181
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(92)90524-v

✦ Synopsis

The small angle scattering instrument Dll at the ILL has been substantially rebuilt over the last 6 years. It is now an even more flexible instrument covering a Q-range from 7.4 x 10m4 to 0.44 A-'. This range may be attained using sample-detector distances between 1.1 and 35.7 m and incident neutron wavelengths of 4.5 to greater than 1.5 A. The collimation system consists of a set of moveable guides which allow the effective source to be placed at 2.5, 4.0, 5.5, 8.0, 10.5, 13.5, 16.5, 20.5 or 40.0m from the sample thus providing a collimation distance closely matched to the sample-detector distance. A new light-weight velocity selector giving a wavelength spread of 10% (FWHM) is used for monochromation of the incident beam. A wide range of sample environments is possible such that the instrument may be used with equal facility for experiments ranging from metal physics and high-T, materials through polymer and colloid systems to problems in molecular biology.