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Reports until 17:29, Monday 18 December 2017
H1 SEI
jim.warner@LIGO.ORG - posted 17:29, Monday 18 December 2017 - last comment - 10:42, Tuesday 19 December 2017(39807)
BSC2 Corner 3 Actuators seem to be crossed up

Trying to get close out tfs on BSC 2 and it appears the Corner 3 actuators are all swapped around. The H3 to H3 l4c/gs13 tfs for both stages look bad, but the H3 to V3 l4c/gs13 tfs look okay. I looked at the cables out of the coil drivers and the order of the labeling is the same for all 3 drivers, so I would guess that some work was done on the outside of the chamber and the cables weren't hooked back up correctly. First attached plot is the St2 tfs (with the cross-over tfs for corner 3), second shows the St2 corner 3 tfs, H3 to H3/V3 gs13s, V3 to H3/V3 tfs. The better looking tfs are H3 to V3 and V3 to H3, the crappy looking ones are H3 to H3 and V3 to V3. The St1 tfs are similarly confused, see third plot.

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hugh.radkins@LIGO.ORG - 08:51, Tuesday 19 December 2017 (39811)

Checked the cables at the Chamber feedthrus--All are consistent  Chassis/Cable Name: C2 F2 F1 C1 maps to label at feedthru: St1 V St2 V St2 H St1 H.  Same for all three corners.  The only thing at Corner3 is the strain relief zip tie is gone but that could have been for some time.  I pulled each cable from the feedthru, noticed nothing to report and resecured.

jim.warner@LIGO.ORG - 10:42, Tuesday 19 December 2017 (39817)

Ed pulled the BSC2 corner 3 coil driver this morning and found that some cables inside were swapped left to right. He's fixed that and re-installed the coil drive. Corner3 tfs look good now. BSC2 is good to go.

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