good alignment before ISI work 4/9 7:00:00 to 13:00:00 alignment before flashing IMC 4/18 21:10:00 to 21:25:00 --- HAM2 ISI --- 9-Apr 18-Apr diff H1 -3860 -3300 560 H2 -2270 -2670 -400 H3 680 -230 -910 V1 712 425 -287 V2 -81 -470 -389 V3 -1728 -90 1638 calibration is 32768cts/mm PRM sees mostly V2 and V3 1638 - (-389) 2027 counts with calibration 0.062 mm distance between V2 and V3 49.5 inches 1257mm change in angle 4.9324E-05 49 urad 49urad at 16.5m 0.0008085m ---- punchline - tilt of the table causes 0.8 mm beam displacement at MC2/HAM3, and all numbers are within the stated spec. of 1600 counts change (well, one is 1628 counts). --- HAM3 ISI --- 9-Apr 18-Apr diff H1 -300 -465 -165 H2 175 410 235 H3 417 -25 -442 V1 -192 -710 -518 V2 -450 -430 20 V3 275 290 15 These numbers are much smaller than the numbers for HAM2. ---- punchline here is that this shows that changing the payload one HAM2 did change the position of the ISI table while it was locked. ---- Attached is a graphic of the table rotation, for HAM2 and HAM3, as I understand it. Arrow length corresponds to the change, and can be compared between HAM2 and HAM3.