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Revision 418 Apr 2018 - HelenaLefebvre

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META TOPICPARENT name="HelenaWork"

Non collision background for ATLAS detector

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 The main task of the group is characterisation and migitation of non-collision background in ATLAS analyses.

Main sources of NBC:

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  • Machine induced background
  • Cosmic-ray background
  • Instrumental background
My work is centered about machine induced background. There are many types of this background but the main sources around the ATLAS detector are the beam-gas scattering (elastic and inelastic) and beam halo. Simple diagram showing the creation of these backgrounds is shown in the figure below.

imgedeb8b152e9c531f09031b2a5c261ff9.png

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Here is an animation of the creation of beam gas background - beam bunch interacting with a residual molecule in the beam pipe and creating background particles.

 
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The lattice geometry in the vicinty of the ATLAS detector is shown below.
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beamgasgif.gif

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The lattice geometry in the vicinty of the ATLAS detector is shown below.

 

img5226e298b827055aa9c558be73e762de.png

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img56087429bc09dbe7f3d7ac2d1fad91b3.png

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