1. Sensitivity tests of BLM_S chamber in PSB dump
(Detector for very high radiation areas of LHC )
11/5/2006
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…
11/5/2006
APC meeting

3. Interior of Secondary Emission Beam Loss Monitor
11/5/2006
APC meeting

4. Geant4 Simulation Results Secondary Emission Yield 0
Geant4 Simulation Results Secondary Emission Yield GeV

5. Geant4 Simulation Results SEY vs. Ti Signal electrode thickness
Beam line SEM screens
BLM_S

6. Installation in the PSB dump line
Screen
BLM_S
ACEM
Rad Hard camera
11/5/2006
APC meeting

7. 2005 PSB measurements
11/5/2006
APC meeting

8. Comparison with results from PSI 250MeV continuous proton beam
11/5/2006
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
11/5/2006
APC meeting

11. Linearity of the SEM response in 2006
11/5/2006
APC meeting

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

13. Quench and Damage Levels
BLMS* & BLMC
Quench level and observation range
450 GeV
7 TeV
Damage levels
Dynamic
Arc: 108
Collimator: 1013
BLMS*: 3.2E13 protonen (nominal SPS injection) lost in about 10E-5 seconds.
Special & Collimator1 turn
Arc
2.5 ms
11/5/2006
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)
11/5/2006
APC meeting