Abstract
Parity-violating electron scattering experiments at intermediate energies measure asymmetries in the 10−6 – 10−5 range and therefore require stringent control of false asymmetries. One of the primary sources of such asymmetries is the combined effect of helicity-correlated changes in a certain beam property, accompanied by a change in the detector response. Careful control of the beam, including the optical properties of the acceleration and transport system, is required in order to reduce these false asymmetries to a manageable level. Developments in beam optics associated with the HAPPEX and G0 experiments at Jefferson Lab are presented.
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