Betsy, Hugh, TJ
Last week Betsy put the heater on the table and today Hugh checked it's vertical center with an auto-level. Some washers were added to get it as close to center as possible, which ended up around 0.4mm high. Betsy and I then had to wiggle the assembly into place, and rotate the entire gold ceramic holder to allow the screws on the outside to clear the OSEM brackets. The heater is currently sitting ~6mm away from the back of the SR3 optic and it is plugged into the feed through.
Picture attached.
Here are a few more pics. As TJ notes, the ROC front face is 5-6mm from the SR3 AR surface. It is locked down in this location.
Note, we followed a few hints from LLO's install:
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=25831
Continuity checks at the feedthru still need to be made. Will solicit EE for their help.
Initial continuity test failed. Found issues with in-vacuum cable, power pins not pushed in completely. Pins were pushed in until a locking click was heard.
Reading are:
Larger Outer Pins, Heater: 66.9Ω
Inner pair (left most looking at connector from air side), thermacouple: 105Ω
Found center of SR3(-X Scribe) to be 230.2mm above optical table. By siting the top and bottom of RoC Heater, found center to be at 231.4mm. Removed available shim to put center of RoC Heater at 229.6 for 230.2-229.6=0.6mm below perfect.
Hugh's comment reminded me that to get the heater to fit, Betsy and I added a 1mm washer to raise the height of the assembly. In total we have 4mm of washers (2x1.5mm & 1x1mm).
I conducted measurement of quantity 6 of [D1600104 SR3 ROC Actuator, Ceramic Heater Assy] at CIT on 4 March 2016. Dirty state before baking. The serial number of the heater assy installed in LHO HAM5 is S1600180 - see https://ics-redux.ligo-la.caltech.edu/JIRA/browse/ASSY-D1500258-002 S1600180 Resistance = 66.8 Ohms on 4 March 2016. There is good agreement between the as-installed and pre-bake measurements.