Experiments are proposed to measure (first longitudinal, then, later, using Stern-Gerlach (SG) deflection, transverse) polarization of an electron beam by measuring the excitation induced in a resonant cavity. In each case there are two major difficulties. The polarimetry signals are very weak, making them hard to detect in absolute terms and, even more serious, is the smallness of the SG signals relative to imperfection-induced, direct excitation of the resonant detector by the beam charge.

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... h ideal resonator construction and positioning, this background would vanish. But, because the electron charge is so large relative to its magnetic moment, special beam preparation and polarization modulation are required to suppress this background. Signal levels and foreground to background ratios are calculated.