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Sensitivity Tests of BLM_S Chamber in PSB Dump at LHC

This study presents sensitivity tests of the BLM_S chamber at the PSB dump in very high radiation areas of the LHC. The chamber operates at low sensitivity levels and is based on Secondary Electron Emission from a Ti electrode, strategically placed in Collimation areas close to Interaction Points and the LHC Dump. The text discusses the installation, results from Geant4 simulations, SEY values, and comparisons with PSI measurements. It covers topics like SEM response linearity, damage levels, and overall system performance.

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Sensitivity Tests of BLM_S Chamber in PSB Dump at LHC

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  1. Sensitivity tests of BLM_S chamber in PSB dump (Detector for very high radiation areas of LHC ) AB/BI D.Kramer

  2. What is BLM_S • Low sensitivity BLM pumped to approx. 10-5 torr • Based on Secondary Electron Emission from Ti electrode • Placed mainly in the Collimation areas, close to IPs, LHC Dump etc… APC meeting

  3. Interior of Secondary Emission Beam Loss Monitor APC meeting

  4. Geant4 Simulation ResultsSecondary Emission Yield0.057 e-/primary @ 1.3GeV

  5. Geant4 Simulation ResultsSEY vs. TiSignal electrode thickness Beam line SEM screens BLM_S

  6. Installation in the PSB dump line BLM_S Screen ACEM Rad Hard camera APC meeting

  7. 2005 PSB measurements APC meeting

  8. Comparison with results from PSI 250MeV continuous proton beam APC meeting

  9. Modified SEM tested in PSI

  10. 2006 Measurements in PSB dump • Modified BLMS installed on the movable stage 19/4 • 1st data taken 4/5 with up to 250e10 protons/bunch (AD user) • maximum intensity allowed by the BLM system • Access due to HV contact 10/5 APC meeting

  11. Linearity of the SEM response in 2006 APC meeting

  12. Simultaneous measurement with SEM and ACEM (PS BLM)equivalent to ~ 1e19 MIPs/s

  13. Quench and Damage Levels Quench level and observation range 450 GeV 7 TeV BLMS* & BLMC Damage levels Dynamic Arc: 108 Collimator: 1013 Special & Collimator1 turn Arc 2.5 ms APC meeting

  14. Summary • SEY from the first measurements in 2006: (5 ± 0.3)% • Good agreement with 5.7% from Geant4 • No more problems with linearity • Sufficient time response • HV scan to be done (we need ~2h beam time) APC meeting

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