8:30 AM–10:00 AM, Saturday, November 10, 2007
Scarritt-Bennett Center - Laskey Great Hall
Chair: Ken Littrell, Oak Ridge National Laboratory
Abstract ID: BAPS.2007.SES.MA.2
9:00 AM–9:30 AM
John F. Ankner
(Neutron Scattering Sciences Division, Oak Ridge National Laboratory)
We have designed and constructed a horizontal-surface reflectometer as one of the first instruments at the Spallation Neutron Source. This instrument is designed to view liquid and solid surfaces in specular, off specular, near-surface small angle scattering, and crystalline diffraction geometries. The guide system supplies 2 {\AA} $<$ \textit{$\lambda$} $<$ 16.5 {\AA} neutrons at vertical incident angles ranging from 0$^{\circ}$ $<$ \textit{$\alpha$}$_{i} <$ 5.5$^{\circ}$ for free liquid surfaces and up to 45$^{\circ}$ for solid surfaces. Three bandwidth choppers, synchronized with the spallation source and operating at 15-60 Hz, provide neutrons in bandwidths ranging from 3.5-14 {\AA} at a fixed \textit{$\alpha$}$_{i}$ onto a sample. The sample stage enables all of the motions necessary for positioning liquid and solid surfaces, while the detector arm allows position-sensitive or pencil $^{3}$He detectors to view the sample at specular or off specular angles up to 90$^{\circ}$ and can scan out of the specular plane by up to 30$^{\circ}$. We will report on our progress commissioning the liquids reflectometer, which essentially involves making the vast parameter space accessible to the instrument accessible to expert and novice users in a coherent and reliable fashion. We have already served our first users and will present examples of data collected, demonstrate our data acquisition and analysis packages, and discuss instrument status.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.SES.MA.2