aLIGO LHO Logbook

H1 General

jeffrey.bartlett@LIGO.ORG - posted 17:52, Tuesday 02 June 2015 - last comment - 18:55, Tuesday 02 June 2015(18806)

High Power Lockloss

Got the IFO to lock at high power (@ 23W) for about 3 minutes before Lockloss. Winds are in the high teens to low 20MPH. Will bring the IFO to DC-Readout and then adjust the power up manually.

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jeffrey.bartlett@LIGO.ORG - 18:33, Tuesday 02 June 2015 (18807)

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Sheila set the power to 15W in Guardian. Took the IFO to LSC_FF (16.6W) and it seems stable. Set the Observation bit to Undisturbed. 

   When bringing the IOF up stopped at ENGAGE_ASC while the Bounce & Roll modes dropped to around 10E-13. Then went to DC_READOUT and paused for a few minutes. Then went to LSC_FF. At this time the IFO is locked and appears stable. Wind is still high (around 20MPH) and gusty (into the 30s. )

sheila.dwyer@LIGO.ORG - 18:55, Tuesday 02 June 2015 (18808)

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We've had three locklosses at 23 Watts in the last 4 hours. The first one of these did coincide with a gust of wind (plot attached), although it might not have been the cause. We've been able to stayed locked with gustier wind in the past at 10 Watts.

In all three of these locklosses there were fluctuations in the POP90 power on 10s of seconds timescales.

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