The Qweak \v{C}erenkov Detector

The Qweak experiment at Jefferson Laboratory will make a determination of the proton's weak charge $\mathrm{Q_W^P = 1-4 \sin^2\theta_W}$ with approximately 4$\%$ combined statistical and systematic errors. This will enable us to extract the weak mixing angle $\mathrm{\sin^2\theta_W}$ at $\mathrm{Q^2 = 0.03 (GeV/c)^2}$ to approximately 0.3$\%$ testing the Standard Model prediction. The key apparatus includes a liquid hydrogen target, a toroidal magnetic spectrometer and a set of eight \v{C}erenkov detectors. The proton's weak charge is determined by measuring the parity violating e-p scattering asymmetry $\mathrm{A_{PV}}$. The proposed experimental precision and statistical uncertainty demand a high performance \v{C}erenkov detector system working in integration mode. These \v{C}erenkov detectors are made of fused silica, allowing us to handle the high rate of 800 MHz per detector for a running time of 2500 hours without significant radiation damage. In this talk, I shall introduce the Monte Carlo simulation, the design, the construction of this detector system, as well as detector performance tests.