A cryogenic torsion pendulum: progress report

Physics

Scientific paper

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Scientific paper

A cryogenic torsion pendulum for gravitational experiments is being refined at its remote operation site near Richland, Washington. Features of the apparatus include: four stages of temperature control, an angular readout of the pendulum about three orthogonal axes and a remote operation capability. Currently, we are testing the apparatus with a nominally symmetric pendulum suspended from a 25 µm diameter Al5056 fibre. Since installing the apparatus in June 1999, we have been testing and fine tuning the instruments and software. Most recently (December 1999) magnetic shielding was added, reducing the eddy current damping of the pendulum by ~103. Magnetic contamination of the test pendulum, with a net magnetic dipole moment of ~6×10-9 N m T-1, served in measuring the effectiveness of the shielding.

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