Penning Trap and Vacuum Noise

A number of comments are provided on Rogers’s model experiment to measure the circular Unruh vacuum noise by means of a hyperbolic Penning trap inside a microwave cavity. It is suggested that cylindrical Penning traps, being geometrically simpler, and controlled almost at the same level of accuracy as the hyperbolic trap, might be a better choice for such an experiment. Besides, the microwave modes of the trap itself, of known analytical structure, can be directly used in trying to obtain measurable results for such a tiny noise effect. PACS 03.65.Bz- Foundations, theory of measurement, miscellaneous theories PACS 32.80.Pj- Optical cooling of atoms; trapping The physics of electromagnetic traps is an extremely vigorous discipline, both theoretically and experimentally speaking [1]. Electrons in the Penning trap (PT), also known as electron geoniums and associated mainly with g−2 experiments, are simple physical systems offering many advantages for measuring