We see a significant amount of displacement of the position of the input beam on the echelle side paraboloid depending on whether the echelon wall is installed or the temporary echelon side support wall is installed. The photo above shows the input beam locations on the target I put over the paraboloid mirror. The grid spacing is 1/4".
The position of the laser spot on the slit wheel is also slightly affected by which wall is installed on the echelon side. With the support wall in, the spot hits the pinhole, and with the echelon wall in, it misses the pinhole in the slit direction by about 0.5mm. This is not directly the cause of the large displacement of the beam on the echelle paraboloid.
Unfortunately, the shimming of the flip mirror and the adjustment of the flip mirror stop were done with the support wall in instead of the echelon wall. Over the next few days I will be redoing the FOE shimming, flip mirror shimming and positioning of the flip mirror stop with the echelon wall installed instead of the support wall.
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