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18 November 2002 Optical design of the SNS liquids reflectometer
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Abstract
Barring a monumental failure of design execution or of performance estimation, the liquids reflectometer at the SNS will provide unprecedented capabilities for the study of liquid and solid surfaces. Design of the instrument is well underway and procurement of the guide components has begun. Nuetrons from a coupled 20-K supercritical hydrogen moderator will be delivered via a multi-channel supermirror bender and tapered guide onto either a horizontal or tilted surface. Collimating slits select the beam incident angle from a 0-5° vertical intensity distribution provided by optics. With the SNS running at 2 MW, the instrument will be able to accumulate a complete specular reflectivity scan from D2O (R < 10-7, Q > 0.5 Å-1) in less than 10 minutes. We will describe the optical design of the SNS liquids reflectometer, compare it with a conventional instrument, and estimate its time resolution for a model kinetic system.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John F. Ankner, Christine Rehm, Edward D. Blakeman, and Roger L. Kellogg "Optical design of the SNS liquids reflectometer", Proc. SPIE 4785, Advances in Neutron Scattering Instrumentation, (18 November 2002); https://doi.org/10.1117/12.451684
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