Problems Related to Measuring the Field Strength of High-Frequency Electromagnetic Fields

Discussion and comparison of the analysis of two cases of an electron of uniform velocity acted on by a uniform magnetic field parallel to the electron direction, and a high-frequency electromagnetic field with the electric component transverse to the beam, shows that, for both a plane parallel-plate field and a rectangular cavity field, the field amplitude may be expressed quite simply in terms of easily measurable parameters. The simple relationship in question requires that certain velocity conditions on the electron velocity be observed, and that the cyclotron frequency ǀeǀ H/mc be equal to the frequency of the alternating electromagnetic field.