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Reports until 13:27, Wednesday 08 July 2026
H1 SEI
jim.warner@LIGO.ORG - posted 13:27, Wednesday 08 July 2026 (90950)
HAM3 tfs look ok, CRS is good, ready to put doors on

This morning, with Mitch and Shoshana, I went into the nozzle between HAM3 and BSC2, via the HAM3 door to fix the broken H3 actuator. I had to remove a couple baffles to get in and get access to the hatch over the H3 actuator, once the hatch was off, I found the pin on the back of the actuator terminal block had come lose, probably when I was in there to do the CPS upgrade. I probably should have checked this wire after I finished that swap, but it there was no way to see that anything was wrong, I had to grab the wire and pull on it. Once that was reconnected and I put everything back together, we did a quick chamberside test and H3 was driving again. I've now completed close out tfs, attached image, and run a CPS linearity measurement to check the new cpses. The linearity test plots failed in a way that didn't save the data, but I do have the terminal output of the test which agrees with HAM7: 

  'Actuator H1 to  CPS H1'

Linear regression y= 1.862 x + 245 

    'Actuator  V1 to  CPS V1'

Linear regression y= 1.890 x + -771 

    'Actuator  H2 to  CPS H2'

Linear regression y= 1.845 x + -271 

    'Actuator  V2 to  CPS V2'

Linear regression y= 5.105 x + 2771 

    'Actuator  H3 to  CPS H3'

Linear regression y= 5.073 x + 1543 

    'Actuator  V3 to  CPS V3'

Linear regression y= 5.119 x + 2882 

At some point after doors go on, I will want to try to fix the cps linearity test script and run it again, among the many other measurements I will need for HAM3.

Images attached to this report
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