edmond.merilh@LIGO.ORG - posted 07:50, Tuesday 25 August 2015 - last comment - 10:25, Tuesday 25 August 2015(20856)
End of Shift Summary and Lock Log - Owl
ALL TIMES IN UTC
Summary:
H1 remained locked for ~6+ hours. LLO went down at 12:39UTC according to Doug Lormand’s aLog. There was ~4hrs coincidental lock with LLO. Wind and Seismic still calm. ETMY glitches at 10:12, 10:24, 11:12, 11:55, 13:19, 13:35, 14:27. Handing off to Jeff B.
LOCK LOG:
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8:49 Locked @ NOMINAL_LOW_NOISE
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9:03 ADD_WHITENING to OMC 66 Mpc
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clearing some SDF diffs for data taking while LLO is up
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Evan doing some light commissioning work before data collecting mode
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9:37 OIB and OOM switched to Undisturbed/Observing
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14:27 Lockloss- Possibly PRAXXAIR delivery
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Sequence started again but maintenance will eventually take it down at 15:00UTC
A plot of lockloss at 14:27:29 UTC is attached.
ASC-POP glitched ~16s before and ASC-PRC2 starts to oscillating at about the same time ( and the oscillation became really huge about ~ 6s before lockloss). They were both high frequency (>128 Hz).
Stefan also looked at the ODC channels yet did not find a clear clue about what might be the cause of this event. https://ldvw.ligo.caltech.edu/ldvw/view?act=doplot&baseSelector=true&Raw_28064=Raw.+&Minute-trend_28064=none&Second-trend_28064=none&Raw_228578=Raw.+&Minute-trend_228578=none&Second-trend_228578=none&Raw_220848=Raw.+&Minute-trend_220848=none&Second-trend_220848=none&Raw_228580=Raw.+&Minute-trend_228580=none&Second-trend_228580=none&strtTime=1124548064&strtTime=&strtTime=&strtTime=&strtTime=&duration=3&repeatDur=0&repeatUnit=seconds&rptCnt=1&plotGroup=time&gwts_hpfilt=&gwts_xmin=&gwts_xmax=&gwts_epoch=&gwts_ymin=&gwts_ymax=&gwsp_secpfft=&gwsp_ovlap=&gwsp_hpfilt=&gwsp_fmin=&gwsp_fmax=&gwsp_ymin=&gwsp_ymax=&spg_window=Hanning&spg_scaling=ASD&spg_secperfft=1&spg_fftoverlap=&spg_fmin=&spg_fmax=&spg_lo=0.2&spg_up=1.0&spg_color=Jet&gwspgm_secpfft=&gwspgm_ovlap=&gwspgm_epoch=&gwspgm_hpfilt=&gwspgm_fmin=&gwspgm_fmax=&gwspgm_ymin=&gwspgm_ymax=&gwspgm_imin=&gwspgm_imax=&gwcoh_refchan=H1%3AASC-ODC_CHANNEL_OUT_DQ&gwcoh_secpfft=&gwcoh_ovlap=&gwcoh_hpfilt=&gwcoh_fmin=&gwcoh_fmax=&gwcoh_ymin=&gwcoh_ymax=&gwcohgm_refchan=H1%3AASC-ODC_CHANNEL_OUT_DQ&gwcohgm_secpfft=&gwcohgm_ovlap=&gwcohgm_epoch=&gwcohgm_hpfilt=&gwcohgm_fmin=&gwcohgm_fmax=&gwcohgm_ymin=&gwcohgm_ymax=&gwcohgm_imin=&gwcohgm_imax=&wplt_plttyp=spectrogram_whitened&wplt_plttimes=1.00+4.00+16.00+32.00&wplt_smplfrq=2048&wplt_pltfrq=0+inf&wplt_pltenergyrange=0.0+25.5&wplt_srchtime=64&wplt_srchfrqrng=0+inf&wplt_srchqrng=4.0+64.0&blrms_fupper=&blrms_flower=&blrms_stride=&doOdc=Generate+ODC+Plots%3Cbr%3E%3Cbr%3E&ts_timeaxis=%26%23916%3Bt&ts_linethickness=2&window=Hanning&scaling=Amplitude+spectral+density&sp_linethickness=2&secperfft=1.0&fftoverlap=0.5&fmin=&fmax=&sp_logx=Freq+axis+logarithmic&sp_logy=Range+axis+logarithmic&sp_newplt=Use+new+plot+functions&coh_scaling=Linear&coh_linethickness=2&coh_secperfft=1&coh_fftoverlap=&coh_fmin=&coh_fmax=&coh_refchan=H1%3AASC-ODC_CHANNEL_OUT_DQ&plotSize=Default+%281200x600%29&plot=Plot+%BB&dwnFmt=LigoDV+export
Besides, the ground motion did not seemed to be related to this lockloss as indicated by the second plot.