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Reports until 10:00, Wednesday 06 September 2023
H1 SEI (OpsInfo)
thomas.shaffer@LIGO.ORG - posted 10:00, Wednesday 06 September 2023 - last comment - 12:38, Wednesday 06 September 2023(72709)
BRSX out of range following thermal enclosure peek yesterday

Yesterday Jim and Fil peeked into the BRSX thermal enclosure and since then the BRS has drifted out of range (see attached). Based on the thermocouple readbacks, it looks like the enclosure has cooled down. Jim thinks that he might not have closed up the enclosure well enough and the heater is already at 9V out of its max of 10V, so he cant add too much more heat. The current plan is to recenter the BRS during our commissioning break today and maybe try to get the heater in a more central voltage location to allow for more future adjustment.

In the mean time, we will have no BRS sensor corrected signal for EX. DIAG_MAIN and the SEI guardians have notifications from this automated process, but we might be more vulnerable to earthquakes during this time.

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jim.warner@LIGO.ORG - 12:38, Wednesday 06 September 2023 (72715)

After the lockloss this morning, I went to ex to look at the enclosure and we didn't completely seal up one of the seams when we shut the box. I fixed that, temps should normalize over the next day. I've bumped the voltage on the heater up, but will probably return that to it's previous value this evening, so we don't overshoot.

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