Magnetic coupling to test mass motion

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Magnetic coupling to test mass motion

• Harald Lück

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Magnetometer in the East End station
number of averages 16 window
function hanning frequency
resolution 0.1 Calib. Const.
0.1V/µT
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Effect onto mirrors

• ca. 5 nTrms _at_ 100Hz
• Assume source _at_ 1m distance ? dB/dx100Hz
  5nTrms/m
• m 0.25 A m2 / magnet. 3 magnets
• F m dB/dx 4 nN/mirror100Hz
• Mirror mass 5.5 kg
• ?x F/(m f4) (Pendulum res. 1Hz)
• ?x 7 E -18 m ? h 6E-21 rms100Hz

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1/f4