22 Mar 2023, 17:08 started the log, the aim for the shift is the alignment of the sample and source point measurement. In addition to that, we also plan to check the Greateyes camera.

22 Mar 2023, 17:53 continuing the sample alignment

22 Mar 2023, 17:54 SAMP_AY is the clockwise direction looking from the top. Positive is towards the smaller incident angles.

22 Mar 2023, 17:57 By moving negative in the coordinated move we brought the sample towards the sliding door when the direction is 90°.

0deg_-alignment-FS.png shows blocking the x-ray beam with the sample.

22 Mar 2023, 18:13 We moved the target paralell to the XFEL beam so that we can either see the direct beam or we block the beam with the target. The next step is to block half of the beam with the target.

direct-beam-0deg.png shows the beam passing by the sample.

22 Mar 2023, 18:39 New zero position is found as on the screenshot New_zero_position_2023-03-22_18-39-16.png 

22 Mar 2023, 19:31 A clear Specular reflection is seen (c.f. Specular_and_reflected_beam_2023-03-22_19-22-19). We now do the angle per px calibration.

22 Mar 2023, 19:35 Specular reflection moves by 41 px for 0.02 deg rotation of the Samp_AY stage. Hence, 20px/0.01deg = 0.00049deg/px

22 Mar 2023, 19:37 We move by 113p = 0.055 deg on Samp_Ay to see the direct beam w.r.t the original sample position. We now move Coordinated motion.

22 Mar 2023, 19:43 Sample aligned parallel to the FEL beam - screenhot attached

22 Mar 2023, 19:48 Sample aligned to an AOI of 0.5 degrees. Screenshot attached. Remember the 2theta shift in the beam angle when the sample stage is rotated by theta. (c,f, AoI_0p25deg_2023-03-22_19-48-29.png - note the angle in file name corresponds to SampAy). Aligned position of the sample is FS_nearbottom_aligned_0.5deg_22032023. This position should be close to the edge at the bottom part of the sample.

22 Mar 2023, 20:54 Direct and Specular beamstops were aligned roughly with ALAS with the IC1 open by CB. We noticed that the breadboard of the specular beamstop motor is not fixed. We now check if this position is fine with the FEL beam without IC1 being pumped. CRL4a shall be driven inside to align this better from the control room.\

22 Mar 2023, 21:52 Direct beam stop was aligned with FEL beam. Specular beamstop was aligned horizontally. Specular vertical axis is only roughly centered.

22 Mar 2023, 22:25 Adjusted c-slits since they were clipping the beam before. p-slits are aligned as well.

22 Mar 2023, 22:48 Now we try to see something on the Greateyes. We bring in Relax alignment laser. Removed filters in IC1, free position in spectrometer. Switched off sensor power. Please insert the filters again before any laser shots!

22 Mar 2023, 23:10 We see something, but not clear what it is. Att. #7