Computer Science – Performance
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprd11007m&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #D11.007
Computer Science
Performance
Scientific paper
The Qweak experiment will measure the proton's weak charge via the parity-violating asymmetry in electron-proton scattering, measuring the asymmetry to a precision of 5 parts per billion. A continuous ˜180 μA beam of polarized 1.1 GeV electrons interacts with a 35 cm liquid hydrogen target. Elastically scattered electrons with momentum transfer Q^2 0.03 GeV^2 are focused onto an array of eight fused silica detectors, each 2 m long. Cherenkov light emitted inside the silica is collected by photomultiplier tubes. The typical electron rate in each detector is ˜700 MHz; during production data-taking, the photocurrent is measured continuously by low-noise integrating electronics. The accelerator can also deliver the same beam at much lower currents (˜100 pA); for these measurements, the phototubes can be connected to higher-gain fast electronics capable of resolving single-electron events. In this talk I will describe the construction, operation, and performance of these detectors.
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