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DVCS – Hall A

DVCS – Hall A. Study of the Background Noise. Florian ITARD. HUGS 2008. University Blaise Pascal. Laboratory of Corpuscular Physics (LPC). Clermont-Ferrand. Deeply Virtual Compton Scattering. The simplest experiment to access to the GPDs. Small cross section ~ 10 -9 Barn.

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DVCS – Hall A

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  1. DVCS – Hall A Study of the Background Noise Florian ITARD HUGS 2008

  2. University Blaise Pascal Laboratory of Corpuscular Physics (LPC) Clermont-Ferrand

  3. Deeply Virtual Compton Scattering The simplest experiment to access to the GPDs Small cross section ~ 10-9 Barn Exclusive experiment Latest experiment ran in 2004 Next experiment will run in may 2009

  4. Scattering chamber Spectrometer Down beam tube pipe Up beam tube pipe Target Proton array Calorimeter

  5. High luminosity ~ 2.5*1037 cm2.s Production of a continuous signal in the photo-mutipliers which is going to inconvenience the measure Important background noise Appeareance of a darkening in the cristal yelded lightundervalued Systematic errors New calibration Curing?

  6. Simulation Monte Carlo: GEANT 4 New detector simulation toolkit written in C++ and developped by The CERN collaboration Enable to generate any particules and follow them in the geometry of the experiment 10 Millions electrons generated by run 9 hours calculation in a farm Window of 640 ns One aim: Reduce the background noise without change the place of the calorimeter in the last experiment

  7. Reference results Mean energy deposited by each electron reaching the target (KeV)

  8. Cone beam pipe Rectangular beam pipe Tungsten shielding Polyethylen front shielding

  9. Final results Mean energy deposited by each electron reaching the target (KeV)

  10. Curing ? Mean energy fonction on the depth of the block

  11. THE END

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