S.Klimenko, LSC March, 2001 Line Noise Investigation l Outline Ø Line Noise Investigation task Ø E2 data, line monitoring Ø Documentation Ø Lines observed.

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Presentation transcript:

S.Klimenko, LSC March, 2001 Line Noise Investigation l Outline Ø Line Noise Investigation task Ø E2 data, line monitoring Ø Documentation Ø Lines observed in E2 data Ø Conclusion LIGO-G Z

S.Klimenko, LSC March, 2001 Line Noise Investigation l Goal Characterization of line noise in the GW channel due to mechanical and environmental resonances, including measurement of line amplitude, frequency, width, etc. l Data Ø ~80h of E2 data starting 11/9 at 9:17:47am ( ) Ø full RDS, ~10% (~90GB) of data actually processed l Line Monitoring Ø use the QMLR method (part of DMT) Ø ~40 lines monitored (0.7Hz – 7000Hz) Ø line trend data (10s-60s) f,a,phase,psd,snr,….. Ø offline monitoring of LSC and IOO channels Ø online monitoring of calibration lines during the run Ø online monitoring of power with MultiVolt l LNI documentation Ø LNI web page: Ø E2 run web page: directory with ~90 plots Ø LNI E2 run report: LIGO-T D

S.Klimenko, LSC March, 2001 LSC-AS_Q l Mainly resonances in the LSC-AS_Q channel were studied. The interferometer noise was 4-5 orders of magnitude higher then nominal, what sometimes made it hard to detect resonances and do their detailed study (like phase analysis). Many expected mechanical resonances can’t be even seen in the data.

S.Klimenko, LSC March, 2001 E2 Lines

S.Klimenko, LSC March, Hz lines l A group of resonances due to pendulum motion of mirrors (BS, RM, ITM, ETM) at Hz. Ø The LM can’t resolve them - seen as a single line l Another narrow line at 0.793Hz is probably due to the small optics (2K) pendulum pitch mode (0.79Hz as measured at LHO) LIGO-G Z

S.Klimenko, LSC March, Hz Line l observed both in LSC-AS_Q and IOO-MC_F channels. measured frequency: 12.05Hz and 12.07Hz respectively l (?)corresponds to the HAM stack resonance (12.1 Hz).

S.Klimenko, LSC March, Hz Line l No mechanical resonances are expected at this frequency. l Possibly it’s an environmental line coming from the fan in office area air handler (expected ~35Hz). l clearly seen in LSC-AS_Q and IOO-MC_F

S.Klimenko, LSC March, 2001 Power Lines

S.Klimenko, LSC March, 2001 Calibration Lines l 4 groups of lines: 31Hz, 71Hz, 271Hz, 901Hz l 4 lines in each group separated by 0.5Hz

S.Klimenko, LSC March, Hz Hz lines

S.Klimenko, LSC March, 2001 Summary l Narrow resonances have been studied and documented from data taken during the E2 run at LHO. l While we have concentrated here on the LSC and IOO channels, similar results have been found in many other channels also. l Using the Quasi-Monochromatic Line Monitor, we have recorded extensive trend data (more then 80 hours) showing frequency and amplitude time variability, frequency spread and possible confusion with other nearby lines. l Overall, we have gathered extensive information about the line noise in the E2 run, which will serve as a first step towards confirmation of the source for the lines we discuss, and also towards an effort to deal with these lines, whether in the instrument itself, or in subsequent data.