...
10:30pm MCC thought they are close to be done with tuning so we started to move Caladium coarse X in reduced x direction and running the Caladium only readout. Before reaching the beam spot, the secondary scatter was ~50 particles/shot but once beam spot came into the frame, that turned to be more like 2000/crossing. Beam spot was also very wide in X ( more than the 2cm MIMOSA aperture). Asked MCC to reduce rate and spot size. a few tries didn't make much impression until a move to close down SL-10 to -0.5. That brought the rate down to ~100 particles/crossing. Beam spot is filling good fraction of aperture ans looks like a good tuning setup to start with tomorrow. The Caladium XYstage X/Ycoarse RBV=115.4/3.8mm (Y is very close to min limit). Run 336 tuning beam spot picture below.
Done for tonight
...
11:00 RD53a DUT stage slight rotated to get slight charge sharing in "phi". Tape measured distances derived an angle of 11.8o. Reconstructed angle from photo gave 13o which are consistent with errors.
11:50 Beam is back on (earlier than expected!)
...