Документ взят из кэша поисковой машины. Адрес оригинального документа : http://zebu.uoregon.edu/~uochep/talks/talks02/G010395.pdf Дата изменения: Thu Sep 26 00:26:23 2002 Дата индексирования: Tue Oct 2 10:34:19 2012 Кодировка: Поисковые слова: wind

LIGO-G020252-00-Z

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Environmental Disturbances
E5, E6 and E7 Investigations

Robert Schofield (Oregon) Group members: S. Mukherjee (AEI), R. Rahkola (Oregon), J. Sylvestre (MIT)

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Locking Difficulties in High Wind
LHO 2k March 12, 2002 wind storm
Fully recycled, with common-mode servo and 1 WFS.
Trend Data 7201 minutes from 02-3-9-21-41-47 to 02-3-14-21-41-47 Maximum Values Each Minute
80

70

Red: Wind Speed (MPH) ; Blue: Arbitrary Units

Wind Speed Corner Station: H0:PEM-LVEA_WINDMPH Arm Transmitted Light: H2:ASC-QPDX_DC

60

50

40

30

20

10

0

0

1800

3600

5400

720

Minutes

Difficulties regaining or holding lock when corner station wind speeds exceeded 25 or 30 mph
This was also the rough threshold during E7 for the LHO 4k in recombined mode (elog 1/11/02).

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BSC Coupling: 33 MPH Y-end Wind
Lower wind speed elsewhere
Power spectrum 10 10 Magnitude 10 1 10 10
-1 3

(X-end: 16 mph; Corn.: 18 mph)

Differential Arm Control (thin reference line: 12 mph)
H1:LSC-DARM_CTRL(REF1) H1:LSC-DARM_CTRL
2

-2 -1 2

10

1 Frequency (Hz) *Avg=1

10

10

*T0=08/01/2002 08:53:33

BW=0.0468749

Y-end seismometer
Power spectrum
H0:PEM-EY_SEISY(REF4) H0:PEM-EY_SEISY
2

10

Magnitude

10

1

10

-1

1 Frequency (Hz) *Avg=1

10

10

2

*T0=08/01/2002 08:53:33

BW=0.0468749

~1.2 Hz BSC modes
MC_F and seismometers at other stations deviated little from reference spectra (elog: 01/11/02)

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HAM Coupling: 40 MPH Corner StationWind
Mode cleaner control (thin reference line: 5 mph)
Power spectrum 10
4

H1:IOO-MC_F(REF6) H1:IOO-MC_F
3

10 Magnitude

10

2

10

1

1 Frequency (Hz) *T0=08/01/2002 08:53:33 *Avg=1

10

10

2

BW=0.0468749

Difference above 10 Hz does not appear in 2k MC and is consistent with signal distortion.

LVEA seismometer
Power spectrum
H0:PEM-LVEA_SEISX H0:PEM-LVEA_SEISX(REF5)

10 Magnitude 1

1 Frequency (Hz) *T0=08/01/2002 12:50:33 *Avg=5

10

10

2

BW=0.0468749

Sub 5 Hz HAM modes

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LLO and LHO Corner Station Wind Speed Histograms
Fraction of Hours in which the top speed was:
Wind Speed (MPH) 0 to 5 5 to 10 10 to 15 15 to 20 20 to 25 25 to 30 30 to 35 35 to 40 40 to 45 45 to 50 50 to 55 55 to 60 60 to 65 65 to 70 70 to 75 75 to 80 over 80 TOTAL above 25 LLO 9718 hours from 3 years 0.370138 0.278349 0.219695 0.097448 0.0254168 0.00699732 0.00133772 0.000308705 0.000102902 0.000102902 0 0 0 0 0 0.000102902 0 0.009 0.104 LHO 1999 0.127873 0.26675 0.255746 0.147931 0.0947207 0.0554395 0.026884 0.0129545 0.00390026 0.00376097 0.000696476 0.000139295 0.000139295 0 0 0


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Seismic Noise Increase With Construction Near Corner Station
Power spectrum
3

10

10

2

Magnitude

10

1
H0:PEM-LVEA_SEISZ H0:PEM-LVEA_SEISZ(REF)

10

-1

1 *T0=07/11/2001 23:18:07 *Avg=2

10

10

2

Frequency (Hz)
*BW=0.1875

Could not lock with this factor of 10 increase (could hold 1 arm at factor of 5 increase) Construction spectrum has shape of non-construction spectrum: evidence for "ground resonance" of about 10 Hz Increase in CARM above 5 Hz predominantly associated with HAM modes: mode cleaner is culprit because coherence between ends drops above 5 Hz

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Power spectrum
10 10 10 10 1 10 10


4

3

2

H2:IOO-MC_F H2:LSC-CARM_CTRL H0:PEM-LVEA_SEISZ H1:SUS-ITMX_SENSOR_LR H1:SUS-MMT3_SENSOR_LR

Magnitude

-1

-2

1


10


10


2

Frequency (Hz) Coherence T0=09/11/2001 14:50:07
ў

Avg=33

BW=0.1875
H0:PEM-HAM8_ACCX / H0:PEM-HAM7_ACCX

1 0.9 0.8 0.7

Coherence

0.6 0.5 0.4 0.3 0.2 0.1 0
Ў

1


10


10


2

Frequency (Hz)
T0=09/11/2001 14:50:07 Avg=33 BW=0.1875


Power spectrum
10 10 10 10 1 10 10


4

3

2

H2:IOO-MC_F H2:LSC-CARM_CTRL H0:PEM-LVEA_SEISZ H1:SUS-ITMX_SENSOR_LR H1:SUS-MMT3_SENSOR_LR

Magnitude

-1

-2

1


10


10


2

Frequency (Hz) Coherence T0=09/11/2001 14:50:07
ў

Avg=271

BW=0.1875
H0:PEM-HAM8_ACCX / H0:PEM-HAM7_ACCX

1 0.9 0.8 0.7

Coherence

0.6 0.5 0.4 0.3 0.2 0.1 0
Ў

1


10


10


2

Frequency (Hz)
T0=09/11/2001 14:50:07 Avg=271 BW=0.1875


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Anthropogenic Seismic Signal

10 9 End-X seismometer Mid - X seismometer

Output of E.Daw's 1-3Hz Band

8 7 6 5 4 3 2 1 0

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Hours after 03:00:00 PST Feb. 1, 02

Spikes are probably trucks on Route 2

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Traced to Vitrification Plant Project
10 km from X-end, up to 5000 workers expected during 5 year project