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Exploring the Size of the Proton pp 45–59Cite as

The COMPASS-II Experiment

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Abstract

The COMPASS-II experiment is a fixed target experiment, located at the CERN Prevessin area at the end of the M2-beamline of the Super Proton Synchrotron. The scattering of high energy leptons or hadrons of a nucleon target allows studying the spin structure of the nucleon and performing hadron spectroscopy.

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Notes

  1. 1.

    This value corresponds to the amount of time during which a beam hits the COMPASS-II target. Technically, the begin of spill signal arrives 1 s in advance of the beam. Furthermore, to guarantee a good beam quality within the analysis, a window between 1 and 10.4 s with respect to the begin of spill signal is used later. This window is 0.2 s shorter than the value given above.

  2. 2.

    Large Angle Spectrometer.

  3. 3.

    Small Angle Spectrometer.

  4. 4.

    Ring Imaging CHerenkov.

  5. 5.

    Generic Advanced Numerical Device for Analog and Logic Functions. For a dense description and the related references see Sect. 9.2.1.

  6. 6.

    Analogue to Digital Converter.

  7. 7.

    Time to Digital Converter.

  8. 8.

    Trigger Implementation for GANDALF Electronic Readout [13].

  9. 9.

    Local Area Network.

  10. 10.

    CERN Advanced STORage Manager.

  11. 11.

    DAQ Data Decoding.

  12. 12.

    COmpass Reconstruction and AnaLysis [1].

  13. 13.

    mini Data Summary Trees.

  14. 14.

    PHysics Analysis Software Tools [15]

  15. 15.

    ROOT really means the “roots” for end-users applications [16].

References

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  2. E. Bielert et al., A 2.5 m long liquid hydrogen target for COMPASS. Nucl. Instrum. Meth. A 746, 20–25 (2014). https://doi.org/10.1016/j.nima.2014.01.067

  3. T. Szameitat, New Geant4-based Monte Carlo Software for the COMPASS-II Experiment at CERN. Dissertation. Albert Ludwigs Universität Freiburg (2017). https://doi.org/10.6094/UNIFR/11686

  4. P. Jörg, Untersuchung von Algorithmen zur Charakterisierung von Photomultiplierpulsen in Echtzeit, Diploma thesis, Albert Ludwigs Universität Freiburg (2013)

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  6. M. Zimmermann, Untersuchungen mit dem RICH Detektor am COMPASS experiment, Bachelor thesis, Albert Ludwigs Universität Freiburg (2015)

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  8. C. Bernet et al., The COMPASS trigger system for muon scattering. Nucl. Instrum. Meth. A 550, 217–240 (2005). https://doi.org/10.1016/j.nima.2005.05.043

  9. T. Baumann, Entwicklung einer Schnittstelle zur Übertragung von Pulsinformationen von einem Rückstoßdetektor an ein digitales Triggersystem, Diploma thesis, Albert Ludwigs Universität Freiburg (2013)

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  12. H.C. van der Bij et al., S-LINK, a data link interface specification for the LHC era. IEEE T. Nucl. Sci. 44, 398–402 (1997). https://doi.org/10.1109/23.603679

  13. S. Schopferer, An FPGA-based trigger processor for a measurement of deeply virtual compton scattering at the COMPASS-II Experiment, Dissertation, Albert Ludwigs Universität Freiburg (2013), https://freidok.uni-freiburg.de/data/9274, URN: urn:nbn:de:bsz:25-opus-92742

  14. R. Fruhwirth, Application of Kalman filtering to track and vertex fitting. Nucl. Instrum. Meth. A 262, 444–450 (1987). https://doi.org/10.1016/0168-9002(87)90887-4

  15. S. Gerassimov, PHysics Analysis Software Tools, http://ges.home.cern.ch/ges/phast

  16. R. Brun, Fons Rademakers, ROOT—An object oriented data analysis framework. Nucl. Instrum. Meth. A 389, 81–86 (1997), proceedings AIHENP’96 Workshop, Lausanne, Sep. 1996, see also: http://root.cern.ch/

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  1. Faculty for Mathematics and Physics, Albert Ludwigs University of Freiburg, Freiburg, Germany

    Philipp Jörg

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  1. Philipp Jörg
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Jörg, P. (2018). The COMPASS-II Experiment. In: Exploring the Size of the Proton. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-90290-6_3

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