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Nuclear Instruments and Methods in Physics Research Research: Accelerators, Spectrometers, Detectors and Associated Equipment 586 (2008) 251-269
G$^0$ Electronics and Data Acquisition (Forward-Angle Measurements)
D. Marchand1, J. Arvieux1, L. Bimbot1, A. Biselli2, J. Bouvier3, H. Breuer4, R. Clark2, J.-C. Cuzon1, M. Engrand1, R. Foglio3, C. Furget3, X. Grave1, B. Guillon3, H. Guler1, P.M. King4, 5, S. Kox3, J. Kuhn2, Y. Ky1, J. Lachniet3, J. Lenoble1, E. Liatard3, J. Liu4, E. Munoz3, J. Pouxe3, G. Quéméner3, B. Quinn2, J.S. Réal3, O. Rossetto3, R. Sellem1
G0 Collaboration(s)

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.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  CMU - Department of Physics
3 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
4 :  UMD - Department of Physics [Maryland]
5 :  UIUC - Loomis Laboratory of Physics
Physique/Physique Nucléaire Expérimentale
parity violation – electron scattering – time encoding – high rate electronics
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G0_electronics_FW.ps(954.3 KB)
G0_electronics_FW.pdf(623.9 KB)