aLIGO LHO Logbook

H1 DetChar

jim.warner@LIGO.ORG - posted 11:46, Friday 01 May 2015 - last comment - 13:42, Friday 01 May 2015(18138)

Intent bit set to Undisturbed

Since DC lock was achieved at 11:09 (after starting to try locking at 9:00 this morning), I've set the intent bit to Undisturbed. Injections are ongoing, the range isn't great and there have been earlier lock losses, but for now I think we can call an official start to the mini-run at LHO.

Comments related to this report

andrew.lundgren@LIGO.ORG - 12:24, Friday 01 May 2015 (18139)DetChar

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We see a swept sine in the data, but the intent bit seems to still be in undisturbed.  I think the agreement on the detchar call is that the intent bit would be treated like science mode, with no excitations or other interventions. We also see some hardware injections, which are fine, since they will be flagged.

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michael.landry@LIGO.ORG - 12:32, Friday 01 May 2015 (18140)

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Andy, all: yep we had one calibration sweep in place during the first lock, apologies. From now on, we'll only allow for hardware injections when the intent bit is set.

Let us know if there is an interval you require (e.g. 2048s?) betwen injections.

andrew.lundgren@LIGO.ORG - 12:55, Friday 01 May 2015 (18142)

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Mike: I think that five minutes should be fine between CBC injections. But if there was a specific request from the CBC group, I don't want to override that.

jim.warner@LIGO.ORG - 13:42, Friday 01 May 2015 (18149)

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We lost lock ~20 minutes ago. I've reset the intent bit. Looks like a rung up violin mode on ITMY. Jeff is working on damping it.