ground motion studies at fermilab of minos hall 100 meters below grade ... data and temp sensor...

Ground motion studies at Fermilab

James T VolkFermilab

James T Volk IWAA 08

Types of ground motion• There is fast ground motion > 1 hertz

– Vibration due to pumps, LCW cryogens– Traffic near and far– Earth quakes– Monitored with seismometer, geophones ect

• There is slow ground motion < 1 hertz– Tidal motion Period of 12 hours– Sump pumps non periodic lasts several hours– Slow sinking of floor– Movement due to ramping of magnets– Monitored using water levels


Goals of Fermilab studies

• Identify types of ground motion both fast and slow

• Identify sources of these motions• Identify amplitudes of these motion• Identify effects on ILC components• Determine ways to eliminate or reduce

these motions


HLS systems in use at Fermilab

• There are two systems in use• 4 Budker sensors in the MINOS hall 100

meters below grade running since December 1 2005

• 6 Budker sensors in use in the LaFrange mine (formerly Conco Western) in North Aurora Running since September 1 2006


Location of MINOS hall 100 meters below grade

MINOS hall


LaFrage Mine North Aurora Illinois

Distance between MINOS And LaFrange mine 6 Kilometers


Budker sensors

Pool andWater connections

Sensor face

Data and temp sensor connections


MINOS water level sensor

Air tap Water tube below level of pool

Pool

Sensor head

ConnectingTubing 12.7 mm diameter


Layout of MINOS water level

MINOS detector

30 meters30 meters30 meters

Not to scale

υ

direction

Sensor

Water line

Depth of floor 100 meters below grade406 feet above sea level Maquoketa shale

Location of Horizontal andVertical seismometer


MINOS Detector

Sensors along wall lower level


Difference in two sensors 90 meters apart MINOS hall


Two sensors 30 m apart MINOS hall


September 06 sump pump test


Difference in two sensors 150 meters apart in Aurora mine


MINOS Hall tilt for 2 years


Dec 19th 2007 Ground Motion and Subsidence


Jan 9th 2008 Subsidence


FFT of MINOS data difference between two sensors

0.0 1.0x10-4 2.0x10-4 3.0x10-4 4.0x10-4 5.0x10-4 6.0x10-4 7.0x10-4 8.0x10-40.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Frequency (Hz)

Am

plitu

de

12 hours tidesFFT of MINOS data L3-L0 sensors

59 minutes

29 minutes


Blow up of FFT showing tide peak

0.00.0 5.0x10-6 1.0x10-51.0x10-5 1.5x10-5 2.0x10-52.0x10-5 2.5x10-5 3.0x10-53.0x10-5 3.5x10-5 4.0x10-54.0x10-5 4.5x10-5 5.0x10-55.0x10-50.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

Frequency (Hz)

Am

plitu

de

Tides in MINOS hall data


Lafarge Mine data two sensors 150 meters apart

Flood in MineSensor failed


Data from MINOS and Larange mine

• Data from MINOS has been collected at a rate of once per minute since December 2005 some occasional lost data

• Data from LaFrange mine has been collected since September 1 2006

• Data are available at http://dbweb1.fnal.gov:8100/ilc/ILCGround App.py/index


Example data from MINOS

Measurement_Date L0 L1 L2 L3 T0 T1 T2 T3 P01/1/2006 0:02 8521.3 8563.8 8502.7 8554.3 24 22.2 22.3 20.4 100.41/1/2006 0:03 8521.5 8563.3 8502.6 8554.3 24 22.2 22.3 20.4 100.41/1/2006 0:05 8521.9 8563.4 8502.3 8554.4 24 22.2 22.3 20.4 100.41/1/2006 0:06 8522.2 8563.2 8502.3 8554.2 24 22.2 22.3 20.4 100.41/1/2006 0:08 8522.2 8563.3 8502.6 8554 24 22.2 22.3 20.4 100.41/1/2006 0:09 8522.3 8563.3 8502.4 8553.8 24 22.2 22.3 20.4 100.4

Time stamp - 4 levels in micro meters – 4 temperatures in C - pressure

The data are available as a comma separated file


ATL Law

• Motion between two points can be described as <dis**2> = ATL

• Where A is a constant • T is the time in seconds• L is length between the points


Calculation of A

• Find the double differences between three sensors

• (D0-D1) – (D1-D2)• Square the double difference• Do this for different time slices from 1

minute separation to 14 days separation• Find the mean of each time slice• Plot versus time


ATL law extracted from MINOS data for November 2006

Dispersion **2 per meter second vs Time

y = 9.8E-06x - 1.4E-01R2 = 9.9E-01

y = 3.1E-06x + 7.1E-02R2 = 1.0E+00

-2.000

0.000

2.000

4.000

6.000

8.000

10.000

12.000

14.000

16.000

18.000

0.E+00 2.E+05 4.E+05 6.E+05 8.E+05 1.E+06 1.E+06 1.E+06 2.E+06 2.E+06

Seconds

mic

ro m

eter

s *82

/m-s

K012/m ss

K123/m

Linear (K012/m ss)

Linear (K123/m)


ATL law results

• Value for A is between 5 10 -6 and 1.5 10 -6

micro meters 2 per m-s• Need to look at more data it may break

down for time spans longer than a few months


Future Work

• Continue slow motion studies of floor in Aurora Mine and MINOS hall

• Updata data base every month with new data

• Measure and identify sources of cultural fast cultural noise in Tevatron and MINOS hall

• Develop techniques to reduce eliminate vibration of accelerator components


Seismic studies in and around Fermilab

• I have four Russian seismometers two measure vertical and two horizontal motions

• One vertical and One horizontal are installed in MINOS hall and data logged with ACNET system

• The others I move around site


Vertical motion at grade Fermilab

0 5 10 15 20 250.0000

0.0005

0.0010

0.0015

0.0020

0.0025

Frequency (Hz)

Am

plitu

de V

olts

MP8 Vertical FFT

CHL


Vertical motion at grade Fermilab log scale

0.1 1 100.0000

0.0005

0.0010

0.0015

0.0020

0.0025

Frequency (Hz)

Am

plitu

de V

olts

MP8 Vertical FFT

CHL


Horizontal motion at grade Fermilab

0 5 10 15 20 250.000

0.001

0.002

0.003

0.004

0.005

0.006

0.007

Frequency (Hz)

Am

plitu

de V

olts

Horizontal FFTMP8 Floor

CHL


Horizontal motion at grade Fermilab log scale

0.1 1 100.000

0.001

0.002

0.003

0.004

0.005

0.006

0.007

Frequency (Hz)

Am

plitu

de V

olts

Horizontal FFTMP8 Floor

CHL


Location of MINOS, MP8 and CHL

The White dot isCentral He LiquefierThere are 3 large Screw compressorAt CHL for liquid He

CHL to MP 8 tunnel1.2 km This is tunnel On grade

MINOS to CHL1.4 km This is tunnel 100 meters below grade


Inside of CHL

Three screwcompressors


Vertical motion MINOS hall

0 2 4 6 8 10 12 14 16 18 20 22 24 26 280.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

Frequency (Hz)

Am

plitu

de V

olts

Vertical MINOS hall no LCW or fans


Vertical motion MINOS hall log scale

0.1 1 100.000

0.001

0.002

0.003

0.004

0.005

0.006

0.007

0.008

0.009

0.010

Frequency (Hz)

Am

plitu

de

Vertical MINOS LCW and fans on


Horizontal motion MINOS hall

0 2 4 6 8 10 12 14 16 18 20 22 240.000

0.001

0.002

0.003

0.004

0.005

0.006

0.007

Frequency (Hz)

Am

plitu

de Horizontal MINOS no LCW or fans


Horizontal motion MINOS hall log scale

0.1 1 100.000

0.001

0.002

0.003

0.004

0.005

Frequency (Hz)

Am

plitu

de Horizontal MINOSLCW and Fans on


More seismic studies

• We are looking at seismic data from MINOS

• Also data from Meson Detector building where the capture cavities are being tested

• Need to understand sources of noise • During August September 07 shutdown

we maybe able to turn off various sources to check

ground motion studies at fermilab of minos hall 100 meters below grade ... data and temp sensor...

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