E3/E4 Line Noise Investigation LIGO-G010353-00-Z Sergey Klimenko Soma Mukherjee Bernard Whiting Bob Coldwell August 15, 2001 Outline  LLO line noise (E4.

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Presentation transcript:

E3/E4 Line Noise Investigation LIGO-G Z Sergey Klimenko Soma Mukherjee Bernard Whiting Bob Coldwell August 15, 2001 Outline  LLO line noise (E4 run)  LLO calibration lines (E4 run)  Magnetometer studies (E3 run)  LLO violin modes (E4 run)

E4 L1:LSC-AS_Q Lines LLO lines:  Power lines (60Hz and harmonics): ~130  Sampling lines (2048, 4096, 6144) + sidebands  Calibration lines + sidebands (16Hz)  Single lines: ~ 15 E4 data  5 hours starting at (15&16 lock sections)  Line Monitor used to track lines

L1:LSC-AS_Q power lines 136 harmonics (all lines marked with red) amplitude of first 9 harmonics

L1:LSC-AS_Q sampling lines Narrow lines at 2048Hz, 4096Hz, 6144Hz  Group of sidebands (modulation at 16Hz sharp)  Sidebands are extremely narrow amplitude of Hz line sidebands Hz 4096Hz

calibration lines (amplitude) E4 run 8 calibration lines for X arm  ITMX(35, 71, 271, 1001) (red curves)  ETMX(36, 72, 272, 1002) (black curves) 271Hz (red), 272Hz(black) 1001Hz (red), 1002Hz(black) 35Hz (red), 36Hz(black) 71Hz (red), 72Hz(black)

calibration lines (phase) Non-stationary TF around 270Hz 271Hz (red), 272Hz(black) 1001Hz (red), 1002Hz(black) 35Hz (red), 36Hz(black) 71Hz (red), 72Hz(black) red – end of lock section blk – start of lock section  30 o

calibration lines (16Hz modulation) no 16 Hz sidebands observed for power lines perhaps sidebands for calibration and sampling lines are sampling artifacts sidebands Hz 1002Hz

LSC-AS_Q “single” lines

E4 L1:LSC-AS_Q Lines (summary) F, HZ W, Hz Rms A, a.e. SNRSourceSystem ?LSC ?LSC ???? LSC HAM stackLSC ~ ???? LSC LSC HVAC system (?)LSC (V)< Power linesLSC, IOO… ???? LSC , <0.05 ???? LSC 35,71,271, ITMX calibration lines + 16 Hz sidebands LSC 36,72,272, ETMX calibration lines + 16 Hz sidebands LSC 2048, Sampling artifacts (1,2,3 harmonics +16Hz sidebands) LSC

Magnetometers study time-frequency analysis of L0:PEM-EX_MAG1X & H0:PEM-EX_MAG1X  correlation of Im and Re parts of data in Fourier domain  for details see S.Mukherjee report at data section (E3) 1800s long: GPS time see pixels with r Hz odd harmonics 60Hz even harmonics 56.7 Hz harmonics

Magnetometers study coherence of PEM-EX_MAG1 XY, XZ and YZ pairs.  LHO - const orientation of the magnetic field vector (one source)  LLO - orientation of the magnetic field changes with time (many sources) amplitude of Hz line LHO LLO

LineMonitor results close look at L0:PEM-EX_MAG1X with the Line Monitor 60Hz even harmonics Hz odd harmonics Hz harmonics Hz modulation Hz Hz

LineMonitor results (continue) What happened?  2 sets of power lines – power mains & compressor  at 212sec motor was switched off -  56.76Hz lines shifted to 59.94Hz amplitudes of 56.76Hz & 59.94Hz harmonics are exactly the same  does it affect the interferometer channel? T<212s T>212s 2x x x x59.94

BS violin modes? BS violin modes are expected around 225Hz (T W) group of lines in Hz region was observed in the E4 LLO data  integrated 3.5h of data ( ) with 2mHz resolution  too low Q to be violin modes… Q ~10000 ? 32 Hz sideband of 271Hz 240 Hz “violin modes”

BS violin modes? Q ~

Documentation & Plans  See LNI results at LineMonitor Complete & submit E3/E4 final report by end of August Further LNI work  Look for magnetometer transients in E4 data & its correlation with interferometer channel  Need more data & more detail study of violin modes  Analysis of E5 data (LHO lines, correlations, violin modes)