LIGO Document T1500316-v1

Magnetic noise from lead glass recoil mass

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T - Technical notes
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This is a look into the displacement noise of the Test Mass by magnetic field fluctuations in the vacuum chamber causing motions of the annular end reaction mass (AERM.) The magnetic susceptibility of the SF2 glass of the ring is larger than that of fused silica and is a possible worry.

The end result of the estimate in this note is that even with larger uncertainties in the magnetic susceptibility of the glass, the noise is negligible by manny orders of magnitude.

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