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The Qweak experiment aims to measure the weak charge of the proton to 4% viathe parity-violating asymmetry ($\sim$-200 ppb) in elastic e+p scattering. Thescattering rate is largely influenced by five beam parameters: horizontalposition (X), angle (X'), vertical position (Y), angle (Y'), and beam energy(E). Changes in these parameters when the beam polarization is reversed willcreate a false asymmetry. To measure the detector sensitivities, we modulate X,X', Y, Y' using four air-core dipoles in the Hall C beamline as well as beamenergy with a superconducting RF cavity. Linear regression is then used toremove the false asymmetry. The beam modulation system has also proven valuablefor tracking changes in the Hall-C beamline optics including dispersion at thetarget.

Beam Modulation System for the Qweak Experiment at Jefferson Lab