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arXiv · nucl-ex/0703026

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

D. Marchand·J. Arvieux·L. Bimbot·A. Biselli·J. Bouvier·H. Breuer·R. Clark·J. -C. Cuzon·M. Engrand·R. Foglio·C. Furget·X. Grave·B. Guillon·H. Guler·P. M. King·S. Kox·J. Kuhn·Y. Ky·J. Lachniet·J. Lenoble·E. Liatard·J. Liu·E. Munoz·J. Pouxe·G. Quéméner·B. Quinn·J. -S. Réal·O. Rossetto·R. Sellem
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Abstract

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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D. Marchand, J. Arvieux, L. Bimbot, A. Biselli, J. Bouvier, H. Breuer, R. Clark, J. -C. Cuzon, M. Engrand, R. Foglio, C. Furget, X. Grave, B. Guillon, H. Guler, P. M. King, S. Kox, J. Kuhn, Y. Ky, J. Lachniet, J. Lenoble, E. Liatard, J. Liu, E. Munoz, J. Pouxe, G. Quéméner, B. Quinn, J. -S. Réal, O. Rossetto, R. Sellem. 2007-03-15. G$^0$ Electronics and Data Acquisition (Forward-Angle Measurements). https://doi.org/10.1016/j.nima.2007.11.028

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