Low magnetic Johnson noise electric field plates for precision measurement

We describe a parallel pair of high voltageelectric field plates designed and constructed to minimise magneticJohnson noise. They are formed by laminating glass substrates with a commercially available polyimide (Kapton) tape, covered with a thingold film. Tested in vacuum, the outgassing rate is less than 5 × 10−5 mbar l/s. The plates have been operated atelectric fields up to 8.3 kV/cm, when theleakage current is at most a few hundred pA. The design is discussed in the context of a molecular spin precession experiment tomeasure the permanent electric dipole moment of the electron.

Source: Review of Scientific Instruments - November 11, 2016 Category: Physics Authors: I. M. Rabey, J. A. Devlin, E. A. Hinds and B. E. Sauer Source Type: research