Документ взят из кэша поисковой машины. Адрес оригинального документа : http://zebu.uoregon.edu/~uochep/docs/docs01/TALKdisturb.pdf Дата изменения: Sat Sep 15 00:16:50 2001 Дата индексирования: Tue Oct 2 11:12:16 2012 Кодировка:

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Environmental Disturbances: E3 and E4 Investigations

Robert Schofield (Oregon) Masahiro Ito (Oregon) Soumya Mohanty (AEI) Steve Penn (Syracuse) Rauha Rahkola (Oregon) Peter Saulson (Syracuse) Julien Sylvestre (MIT)

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Topics

Peter Saulson's comparison of glitch monitors

Masahiro Ito's glitch catalog

David Shoemaker's compilation of environmental data

My table of frequencies of environmental sources

My initial attempts at impulse transfer functions

Masahiro Ito's histogramming tool and John Zweizig's histogram comparing monitor

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Different behavior of glitch monitors in E4
Peter Saulson identified several glitches that were caught by only one monitor. John and Masahiro resolved differences. Missed by glitchMon: bug caused loss of channel.

Missed by Glitch: statistics calculated for current second.


Missed by glitchMon: bug caused loss of channel.

Second glitch missed by glitchMon: old version did not exclude glitch from statistics.

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Glitch catalog
Masahiro Ito has started a catalog at: http://blue.ligo-wa.caltech.edu/users/mito/GlitchCatalog/

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The LIGO Observatory Environment Edited by David Shoemaker
http://ligo.caltech.edu/~dhs/Adv-LIGO/T010074-03-D.pdf

Page 16

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Frequencies of environmental sources at Hanford
http://apex.ligo-wa.caltech.edu/~roberts/PEMfrequencies.pdf
Frequency Hz 0.03 - 0.09 1.2 2.5 3 - 12 3.2 5-15 6.5 7 - 15 9-11 10 - 15 19 19.3 21 22 - 27 24 30 30 30 30 distant earthquake seismic and magnetic peak excited by moving Y-end crane seismic and magnetic peak excited by moving Y-end crane truck traffic on 240 and other roads (about 60 MPH) seismic and magnetic peak excited by moving Y-end crane stomp seismic and magnetic peak excited by moving Y-end crane car traffic on 240 and other roads (about 60 MPH) seismic and magnetic peak excited by moving Y-end crane Yakima Firing Center tank shot signal seismic and magnetic peak excited by moving Y-end crane optic lab ventilator? office area air handler fan belt harmonic clean room fans unknown source - on magnetic and control signals office area air handler fan motor LVEA air handler Kobelco purge aircompressor pump Culligan water conditioner pump 9/99 9/99 9/99 9/99 Source or comments Date 1/00 11/01 11/01 5/00 11/01 11/00 11/01 5/00 11/01 11/00 11/01 11/00 9/99 9/99


Frequency Hz 32 35 40 42 54 55 55-65 57 - 60 57.5 58.5 59 59 59 64 69.9 72 76 98.7 100 133 255 255 256 256 266

Source or comments office area air handler belt harmonic office area air handler fan 4k PSL table leg office area air handler fan belt harmonic 4k PSL table leg LVEA chiller pad air compressor 4k PSL periscope LVEA pad water-chiller compressors (12 compressors) LVEA pad main pumps mechanical room chilled water supply pump Culligan water conditioner pump (LVEA access bay) Kobelco purge air compressor compressor Edwards turbo backing pump office area air handler belt harmonic Gateway monitor chiller pad air compressor Sun monitor unknown: in control signals for a long time magnetic field at vault dust monitors reference cavity periscope turbo pump power supply PSL periscope at laser (main beam) E. O. power supply fan dust monitors

Date 9/99 9/99 6/01; elog 6/09/01 9/99 6/01; elog: 6/09/01 1/01 6/01; elog: 6/09/01 9/99 9/99 9/99 9/99 9/99 9/99 9/99 4/01 1/01 4/01

5/01 3/00 6/00 6/00 6/00 11/00: elog: 10/11/00 3/00


Frequency Hz 320 388 390 394 510-550 6-8k

Source or comments 4k PSL periscope mirror support Electronics Solutions crate power supplies 4k PSL periscope mirror support Electronics Solutions crate power supplies dust monitors pre-mode cleaner body modes

Date 6/01; elog 6/9/01 2/01; elog 2/17/01 6/01; elog 6/9/01 2/01; elog 2/17/01 3/01 6/00

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Acoustic impulse on microphones and mode cleaner control
Hit trash can close to PSL:
Red: PSL mic (not as in legend); Black: MC_F; Blue: Ham 8 mic
Time series 10000 8000 6000 4000 Signal 2000 0 -2000 -4000 -6000 -8000 -10000 5 5.05 5.1 5.15 Time (s) T0=06/07/2001 00:31:06 Avg=1 5.2 5.25 5.3
H0:PEM-HAM9_MIC[0][3] H0:PEM-HAM8_MIC[0][3] H2:IOO-MC_F[0][3]

Hit same trash can close to Ham 8:
Time series 10000 8000 6000 4000 Signal 2000 0 -2000 -4000 -6000 -8000 -10000 0.2 T0=06/07/2001 00:30:50 0.25 0.3 0.35 Time (s) Avg=1 0.4 0.45 0.5
H0:PEM-HAM9_MIC[0][1] H0:PEM-HAM8_MIC[0][1] H2:IOO-MC_F[0][1]

Ball park coupling: 300 Hz/Pascal at PSL table

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Taps of a pen
Against X-end of PSL Table:
Red: PSL accelerometer X; Blue: MC_F.
Time series 25000 20000 15000 Signal 10000 5000 0 -5000 -10000 -15000 5.5 5.6 5.7 5.8 5.9 6 Time (s) T0=12/08/2001 04:42:55 Avg=1 6.1 6.2 6.3 6.4 6.5
H0:PEM-PSL2_ACCX[0][3] H2:IOO-MC_F[0][3]

In the 150 to 400 Hz band roughly 0.01 Hz per µm/s2 Against HAM7 cross beam:
Red: HAM7 accelerometer; Blue: MC_F
Time series
H0:PEM-HAM7_ACCX[0][1] H2:IOO-MC_F[0][1]

30000 20000 10000 Signal 0

-10000 -20000 -30000 0 1 2 3 4 Time (s) T0=12/08/2001 04:29:06 Avg=1 5 6 7 8

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Histograms of channel levels
John Z.'s histogram comparing monitor with Masahiro I.'s Histogramming tool. Such histograms could be used to select veto levels.

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