G$^0$ Electronics and Data Acquisition (Forward-Angle Measurements)

Details G$^0$ Electronics and Data Acquisition (Forward-Angle Measurements) G$^0$ Electronics and Data Acquisition (Forward-Angle Measurements)

2007-03-15

arxiv.org/abs/nucl-ex/0703026v1

Nucl.Instrum.Meth.A586:251-269,2008

Physics

Nuclear Physics

Nuclear Experiment

35 pages. 17 figures. This article is to be submitted to NIM section A. It has been written with Latex using \documentclass{el

Scientific paper

10.1016/j.nima.2007.11.028

The G$^0$ parity-violation experiment at Jefferson Lab (Newport News, VA) is designed to determine the contribution of strange/anti-strange quark pairs to the intrinsic properties of the proton. In the forward-angle part of the experiment, the asymmetry in the cross section was measured for $\vec{e}p$ elastic scattering by counting the recoil protons corresponding to the two beam-helicity states. Due to the high accuracy required on the asymmetry, the G$^0$ experiment was based on a custom experimental setup with its own associated electronics and data acquisition (DAQ) system. Highly specialized time-encoding electronics provided time-of-flight spectra for each detector for each helicity state. More conventional electronics was used for monitoring (mainly FastBus). The time-encoding electronics and the DAQ system have been designed to handle events at a mean rate of 2 MHz per detector with low deadtime and to minimize helicity-correlated systematic errors. In this paper, we outline the general architecture and the main features of the electronics and the DAQ system dedicated to G$^0$ forward-angle measurements.

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