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Title: G0 Electronics and Data Acquisition (Forward-Angle Measurements)

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.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
902174
Report Number(s):
JLAB-PHY-07-622; DOE/ER/40150-4260; nucl-ex/0703026
TRN: US0702803
DOE Contract Number:
AC05-84ER40150
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; ARCHITECTURE; ASYMMETRY; CROSS SECTIONS; DATA ACQUISITION; ELASTIC SCATTERING; HELICITY; MONITORING; PROTONS; QUARKS; SPECTRA

Citation Formats

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. Quéméne, B. Quinn, J.-S. Réal, O. Rossetto, and R. Sellem. G0 Electronics and Data Acquisition (Forward-Angle Measurements). United States: N. p., 2007. Web.
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. Quéméne, B. Quinn, J.-S. Réal, O. Rossetto, & R. Sellem. G0 Electronics and Data Acquisition (Forward-Angle Measurements). United States.
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. Quéméne, B. Quinn, J.-S. Réal, O. Rossetto, and R. Sellem. Wed . "G0 Electronics and Data Acquisition (Forward-Angle Measurements)". United States. doi:. https://www.osti.gov/servlets/purl/902174.
@article{osti_902174,
title = {G0 Electronics and Data Acquisition (Forward-Angle Measurements)},
author = {D. Marchand and J. Arvieux and L. Bimbot and A. Biselli and J. Bouvier and H. Breuer and R. Clark and J.-C. Cuzon and M. Engrand and R. Foglio and C. Furget and X. Grave and B. Guillon and H. Guler and P.M. King and S. Kox and J. Kuhn and Y. Ky and J. Lachniet and J. Lenoble and E. Liatard and J. Liu and E. Munoz and J. Pouxe and G. Quéméne and B. Quinn and J.-S. Réal and O. Rossetto and R. Sellem},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 18 00:00:00 EDT 2007},
month = {Wed Apr 18 00:00:00 EDT 2007}
}
  • The results from the G0 forward angle experiment are reported in this talk. The parity-violating asymmetry of elastic e-p scattering has been measured within the range of the four-momentum transfer (Q2) from 0.12 to 1.0 (GeV/c)2, which yields linear combinations of the strange electric and magnetic form factors of the nucleon, G{sub E}{sup s} + {eta}G{sub M}{sup s}, in the same Q2 range. The G0 results, combined with the measurements from other experiments, indicate that G{sub E}{sup s} and G{sub M}{sup s} are both likely non-zero.
  • United States missile projects, goahs, and budget aspects are discussed. Missile guidance and control systems are described, and data acquisition methods and equipment are explained. Propulsion and power generation, especially that derived from nuclear and electrical devices, are discussed. Finally, earth-based electronic devices which are important in missile operations are described. (L.N.N.)
  • We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 < Q{sup 2} < 1.0 GeV{sup 2}. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange quark contributions to the currents of the proton. The measurements were made at JLab using a toroidal spectrometer to detect the recoiling protons from a liquid hydrogen target. The results indicate non-zero, Q{sup 2} dependent, strange quark contributions and provide new information beyond that obtained in previous experiments.
  • We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12{<=}Q{sup 2}{<=}1.0 GeV{sup 2}. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange-quark contributions to the currents of the proton. The measurements were made at Jefferson Laboratory using a toroidal spectrometer to detect the recoiling protons from a liquid hydrogen target. The results indicate nonzero, Q{sup 2} dependent, strange-quark contributions and provide new information beyond that obtained in previous experiments.
  • The NA48 experiment at the CERN SPS offers a four fold improvement in statistical and systematic error over earlier measurements of the magnitude of the direct CP (Charge-Parity) violation of the neutral Kaon system. This requires maximum event readout efficiency, controlled event building and fast monitoring of run time errors. The event data flow in particular must be sustained at 100 Mbyte/s. The Data Merger Readout Controller presented in this paper offers this facility at minimal production cost.