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Instrument Cg2

For more information, contactInstrument Scientist: Ken Littrell,, 865.574.4535 Instrument Scientist: Yuri Melnichenko,, 865.576.7746 Scientific Associate: Katherine Bailey,, 865.574.3989 The general-purpose SANS diffractometer is optimized for providing information about structure and interactions in materials in the size range of 0.5 200 nm. It will have cold neutron flux on sample and capabilities comparable to those of the best SANS instruments worldwide, including a wide range of neutron wavelengths =5 25 , resolution / =9-45%, and a 1-m2 area detector with 5- 5-mm2 pixel resolution with a maximum counting capability of up to 25 kHz. The sample-to-detector distance can be varied from 1 to 20 m, and the detector can be offset horizontally by up to 45 cm, allowing a total accessible Q range of from <0.001 to 1 -1. The 2-m sample environment area will accommodate large, special-purpose sample environments such as cryomagnets, furnaces, mechanical load frames, and shear cells.

Applications Soft condensed matter: molecular self-assembly and interactions in complex fluids; intermediate order in glassy systems, polymer solutions, gels and blends, colloids, micelles, and microemulsions Hard condensed matter: phase separation, grain growth, and orientation in metallurgical alloys, nanocomposites, advanced ceramics, and porous catalytic and adsorbent materials Magnetic systems: flux lattices in superconductors, ferrofluids, and the relationship between structural and magnetic domains and ordering 06-G01669D/gim Beam spectrum Cold Monochromator Helical slot selector Incident wavelength 4 < < 25 Resolution range / 9 45% Collimation Eight removable guide sections, each 4 4 cm2 and 2 m long; 2-m open area at sample stage to mount auto- matic changers, furnaces, mag- nets, cryostats, pressure cells, etc.

Q range ( -1) 1.5-m collimation 20-m collimation 0.038 < Q < 1.0 -1 (5 ); 0.019 < Q < 0.50 -1 (10 ) 0.004 < Q < 0.074 -1 (5 ); 0.002 < Q < 0.037 -1 (10 ) Sample- detector distances 1 < D < 20 m Detector 2-D (3He) posi- tion-sensitive detector with 1-m2 active area and 5.1 x 5.1 mm2 pixels Max counting rate 25 kHz Specifications March 2010 Status: Operational

Research Reactors
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