July 25th- Day 19

Not so successful.

Once the new power and x-ray sources became available, Alex and Zewu were pressed for time to get data. Using the Co source, they first found an image using the camera. The image of the Ge(111) was more of a square compared to the image we obtained using the Si(111) optic. We were back to using the SDD high intensity detector that we were having problems with previously. Zewu and Alex were looking for a high flux which would mean a high efficiency. To compare sources, they would look at the intensity, from which they could calculate flux. A 127 micron Ni filter was used when taking the spectra. After they got the data they needed, we tried to minimize the spot size. We found the spot fairly quickly in the vertical, but had very different luck trying to find the spot in the horizontal direction. The spot size kept decreasing and the astigmatism would have been extremely large (~12mm minimum). Since the astigmatism should not be that large, we abandoned the scans. Alex said the tools were not right to make the optic so it would not be precise like the Si(111) optic. This spot size would have been significantly larger than the Si spot size due to the differing lattice structures. Due to being pressed for time, we would have to move on to test the PET(002) optic and come back to the Ge(111) spot size measurements.