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MAGIK Instrument Horizontal Sample Mode

In the summer and fall of 2019, the MAGIK neutron reflectometer was upgraded to implementing the original monochromator and a vertically mobile monochromator on a horizontal translation stage that could swap out one for the other depending on the desired configuration. The newly installed monochromator assembly that could be translated vertically provided a smooth and relatively constant beam for any incident angle. The experimental setup allows the sample environment to sit on a fixed stage for reflectivity measurements. This is currently the horizontally-modified MAGIk setup under beta testing.  

The horizontal MAGIK geometry and configuration is shown as schematic in the Figure 1 below. For the new horizontally-staged configuration, the neutron beam still passes through the new monochromator with an optimized wavelength of 5 Å. The neutron beam is then collimated on a horizontally-staged sample at an incident angle, \(\alpha_i\), by two pre-sample slits of width \(w_i\), and one aperture slit \(a_i\)  (Figure 1). The beam is then reflected off the sample, through another slit 3 at an angle \(\alpha_f\), where \(\alpha_i = \alpha_f\), toward the point source detector. Pre-sample slits 1 and 2 and post-sample slits 3 translate vertically along the z-direction to reach the sample interface. Future modifications will be made to implement a second post-sample slit, or slit 4, to further collimate the reflected beam and suppress background scattering.

Layout of the MAGIK neutron reflectometer in Horizontal Sample Mode
Figure 1: Schematic of horizontal MAGIK setup. Monochromatic neutron beam (red) is collimated by pre-sample slits 1 and 2, which move in the z-direction such that it directs the beam at an incident angle \(\alpha_i\) onto the sample. The slit openings with width \(w_i\) and aperture \(a_i\) determine the beam footprint \(F_b\) on the sample. A post-sample slit 3, which also moves in the z-direction, is added in front of the detector to capture the neutron beam at a reflected angle \(\alpha_f\) equal to \(\alpha_i\) .
Created February 5, 2022, Updated April 27, 2023