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A Liquid Hydrogen Target for the Precision Measurement of the Weak Mixing Angle in Møller Scattering at SLAC


A 150 cm long liquid hydrogen target has been built for the SLAC End Station A E-158 experiment. The target loop volume is 55 liters, an the maximum target heat load deposited by the electron beam is ~700 W. The liquid hydrogen density fluctuation with full beam current (120 Hz repetition rate, 6 1111 electrons/spill) on target is at the 10-5 level, which fulfills the requirement for a precision measurement of the weak mixing angle in the polarized electron-electron scattering process.

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