Danny TVo Georgia
This morning we pico'd the top periscope mirror on the CO2X table, it is now roughly centered on ITMX. From last night's long-duration low-power ring heater test we know where the center of the test mass is relative to the centre of the HWS beam. We then used 5-10 minute blasts of 1-2 W CO2 to see where the CO2 beam is, and approximately aligned this with the centroid of the ring heater contours.
The contours from the ring heater test are shown in the first attachment, the center is roughly (+12.5, +12.5 mm) relative to the Hartmann center.
The second attachment shows the CO2 central heating, and the third shows the annular heating. NOTE: we moved the picomotor -700 counts (~4mm right (very rough) on the Hartmann camera) after taking these screenshots and didn't get a chance to take another CO2 test. The final position of the top periscope mirror is -11787,-1500 counts.
We removed the iris before these images were taken and are not sure why we don't see the full annular mask, particularly in yaw. (We also no longer seem to be limited by the confusing ghost beam which we put the iris in to remove).
The fourth attachment shows the FLIR camera image of the CO2 beam on the table with the central mask in - the beam is not quite centered on the mask in yaw which is something we might want to fix in the future.
Some more information on the ITMX RH test from this post. The trend data is attached and I've posted a couple of the contour plots showing displaying two different times when ITMX lensing reached a steady state (as suggested by the HWS spherical power).
Additional additional info: we retook the annular mask CO2 test on friday evening. It looks like we were better centered *before* the final 700 count move and should maybe consider moving back. Two screenshots from different stages of the heating-up process attached.
