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Neutron Hunt

Neutron Hunt. Project presentation b y Andreas Nørgård Larsen, Copenhagen University. Intro. W here : CMS What : Medipix detectors . Why : Online neutron detection gives better knowledge of neutron flux . So we can : A djust simulations of the radiation in the CMS cavern .

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Neutron Hunt

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  1. Neutron Hunt Project presentation by Andreas Nørgård Larsen, Copenhagen University

  2. Intro • Where: CMS • What: Medipixdetectors. • Why : Online neutron detectiongives betterknowledge of neutron flux. So wecan: • Adjustsimulations of the radiation in the CMS cavern. • Provide knowledgeabout the risk of Single Event Upset (SEU).

  3. Single Event Upset • Change bit in electrical device: 10 • Example: Failure in electronics in CNGS (CERN Neutrinos to Gran Sasso) in 2007

  4. Medipix • Silicon: measure chargedparticles • Low crosssection for direct neutron-Si interactiongeneratingchargedparticles, therefore: Conversion layers! Picture from: www.scienceinschool.org

  5. Conversion layers Picture from: D. Turecek, T. Holy, S. Pospicil, Z. Vykydal, Elsevier ; Nuclear Instruments and Methods in Physics Research A 633 (2011) S45–S47

  6. Conversion layers • Today’sfocus: Polyethylene, PE • Effective for fast neutrons, i.e. from 2 to 50 MeV.

  7. Polyethylene • Elasticscattering • The process of kicking out protons has a highcrosssection for fast neutrons • Protons arecharged!

  8. Polyethylene • Elasticscattering • The process of kicking out protons has a highcrosssection for fast neutrons • Protons arecharged!

  9. Effect of Conversion layers- simulation with FLUKA

  10. Thickness of PE conversionlayer

  11. Density of PE conversionlayerThicknessis 1.3 mm

  12. Neutrons in the CMS Simulated data from this point

  13. I hopeyouknow • Why neutrons are still interesting. • How to huntthem.

  14. Thankyou for your attention! Special thanks to: • Dieter Loterman (focus data) • Sophie Mallows (FLUKA expert 1) • Mouritz Guthoff (FLUKA expert2) • Slawomir Konrad Tadeja (Computer expert) • ArkadyLokhovitskiy (supervisor) • Alan James Bell (supervisor)

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