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Radiation Environment at AWAKE

Radiation Environment at AWAKE. Eduard Feldbaumer, Silvia Cipiccia, Helmut Vincke AWAKE Collaboration Meeting – April 2014. Outline. Simulation parameters Side injection: Prompt dose rate Damage to Electronics On axis injection Prompt dose rate Damage to Electronics

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Radiation Environment at AWAKE

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  1. Radiation Environment at AWAKE Eduard Feldbaumer, Silvia Cipiccia, Helmut Vincke AWAKE Collaboration Meeting – April 2014

  2. Outline • Simulation parameters • Side injection: • Prompt dose rate • Damage to Electronics • On axis injection • Prompt dose rate • Damage to Electronics • Dose rate from Activation • Radiation background at Lanex screen • Summary

  3. Proton source routine • Momentum 400 GeV/c • Momentum spread 1.2 GeV/c(1 sigma) • Initial distr. (1 sigma): • x, y = 0.02 cm • z = 13.9 cm • Divergence (mrad): • small = 0.024 • large = 0.36

  4. Side injection: Plasma Cell 40 mm • Rubidium gas • r = 20 mm • Plasma cell - Steel • l = 10 m • d = 2 mm • Offset 5 mm up • Proton shielding - Steel • l = 6 m • r = 15 mm • d = 1 mm e- p+ Plasma cell Vacuum chamber Cut through plasma cell

  5. Prompt dose – Nominal operation • Nominal operation • Beam intensity: 3E11 p+/bunch • Repetition rate: 1/30 Hz AWAKE CNGS

  6. Damage to electronics (D2E) • Cumulative damage commercial COTS hardened electronics accelerators Semiconductors Polymers Ceramics Metals and alloys • Stochastic damage • From M. Brugger ‘Radiation Damage to electronics at the LHC’, IPAC2012: • Commercial equipment: ~107 HEH/cm2/year From M. Brugger presentation for CERN FLUKA user meeting 2008

  7. Fluka Simulations Results 15 mm steel 6 m long Dose equivalent [mSv/bunch] 1 MeV n-eqfluence per year HEH fluence per year 1013n/cm2 107cm-2

  8. On axis injection : updated geometry Lanex Screen (Gd2O2S) Plasma Cell from ErdemÖz Bending Magnet Separation wall from Sylvain Girod Inner & outer steel tube 3.5 cm Rubidium Thermal oil Microtherm layer

  9. Prompt dose rate mSv/bunch New Geometry Old Geometry

  10. Damage to Electronics • 1 MeV neutron equivalent fluence per year 1013n/cm2 • HEH fluence per year 107cm-2

  11. First Activation Simulations • Irradiation: 2 x 4 weeks/year 4 years • LS 2 not considered

  12. Residual Dose [mSv/h] End of second run End of last run < 15 uSv/h After 1 hour After 1 month

  13. Electron & Proton simulations • 2 GeV electron beam from plasma cell bent by the bending magnet • 400 GeV proton beam (3e11 p+/bunch) through plasma cell

  14. Lanex screen: Noise level • Energy deposition per electron (GeV/cm3) • Energy deposition per proton bunch (GeV/cm3) Electron: ~ 5x10-5GeV/cm3 Proton bunch: ~ 50 GeV/cm3 Signal:Noise = 10 ~ 107 e-  ~ 2pC

  15. Summary • Damage to Electronics in vicinity of Electron Spectrometer • cumulative effects due to dose and neutron flux negligible • SEE: HEH fluence limit exceeded close to beam • New Plasma cell design: • No improvements in terms of dose and D2E • Activation level in AWAKE area: • Residual dose < 15 uSv/h • Lanex screen: • signal to noise ratio 10: ~ 2 pC e- (2 GeV)

  16. Thank you for your attention!

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