aLIGO LHO Logbook

H1 SEI (DetChar, PEM)

jeffrey.kissel@LIGO.ORG - posted 12:03, Sunday 26 July 2015 - last comment - 12:34, Sunday 26 July 2015(19944)

Bubba Roars Off on a Motor Cycle at 18:56 UTC

J. Kissel, B. Gateley

After finishing up working on a repair water system, Bubba said he was going to take off in a bit. He was worried about about making noise while driving away on his motorcycle, but I challenged him to let'er rip such that we can dispel aLIGO superstitions that are carry-overs of the ol' i/eLIGO seismic isolation system. 

He left from the shipping and receiving area (North East (-Y) of the output arm of the corner station), and I could hear his bike from the control room as he drive off. I saw no visible effects on the IFO from the figures of merit in here, and the IFO is running as fabulously as it has all morning.

@DetChar -- can you find anything? 

He drove off ~18:56 UTC (11:56 PDT).

Comments related to this report

andrew.lundgren@LIGO.ORG - 12:34, Sunday 26 July 2015 (19946)

Link

I can definitely see it on the BS and LVEA mics, though it's a bit hard to hear. There's a lot of ambient noise - I don't know if they're near HVACs or cleanrooms, or if it's the way that the signal is conditioned, or my headphones just have bad lowrange.

I don't see anything in DARM (second plot). If anyone wants to try coherence or anything else more sophisticated, the motorcycle sounds peaks at 1121972165 and extends 15 seconds on a side, though I think maybe the engine is idling for a minute before that.

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