PENNING TRAP AND VACUUM NOISE

A number of comments are provided on Rogers's model experiment to meas ure the circular Unruh vacuum noise by means of a hyperbolic Penning t rap inside a microwave cavity. It is suggested that cylindrical Pennin g traps, being geometrically simpler, and controlled almost at the sam e level of accuracy as the hyperbolic trap, might be a better choice f or such an experiment. Besides, the microwave modes of the trap itself , of known analytical structure, can be directly used in trying to obt ain measurable results for such a tiny-noise effect.