Version Differences for SGM Beamline

[[Image:SGM_User_Manual_Fig1.jpg|frame|right|<div align="center"> Figure 1: The Optical Layout of the SGM Beamline </div>]] The SGM beamline is comprised of 9 optical elements. These are the variable aperture mask (VAM), first deflecting mirror (M1), second deflecting mirror (M2), vertical focusing mirror (M3), entrance slit (ENS), diffration grating (LEG, MEG and HEG), exit slit (EXS), first refocusing mirror (M4) and second refocusing mirror (M5). The layout of these components is shown in Figure 1. The VAM is used to define an aperture for the beamline optical system. It serves to block the intense unusable radiation from the first mirrors in the beamline. The VAM position is fixed by the beamline staff and shouldn't be moved by beamline users. M1 and M2 are identical plane mirrors that serve several purposes. Their primary purpose is to deflect the beam by a total of 3 degrees. In doing this, these mirrors also act as a filter for the higher energy xrays and gamma rays coming down the beamline.