1. Summary: Workshop on CMS Beam Conditions, Radiation Monitoring and Luminosity Systems
Oliver Stein, May 2013, CERN

2. Overview Workshop on CMS Beam Conditions 22. April – 24.April.2013
DESY Zeuthen, Germany
45 talks
32 participants
All talks and slides:

3. Overview CVD Diamonds BRM Beam Radiation Monitor Others BCM
Beam Condition Monitor
BCM1F (fast ~ ns)
BCM1L (slow 40 µs )
BCM2 (slow 40 µs )
PLT
Pixel Luminosity Telescope
BSC
Beam Scintillation Monitor
BPTX
Beam Pick-up time for Experiments
CVD Diamonds

4. Overview CVD Diamonds BRM Beam Radiation Monitor Others BCM
Beam Condition Monitor
BCM1F (fast ~ ns)
BCM1L (slow 40 µs )
BCM2 (slow 40 µs )
PLT
Pixel Luminosity Telescope
BSC
Beam Scintillation Monitor
BPTX
Beam Pick-up time for Experiments
PLT
z=175m
BPTX
CVD Diamonds

5. BCM Setup before LS1 BCM1F 8 sCVD diamond detectors
detection of fast beam losses (halo and collisions)

6. BCM Setup before LS1 BCM1F 8 sCVD diamond detectors
detection of fast beam losses (halo and collisions)
BCM1L
8 pCVD diamond detectors
leakage current monitor
integrated in beam abort system
BCM1F and BCML share mount carriage

7. BCM Setup before LS1 BCM1F 8 sCVD diamond detectors
detection of fast beam losses (halo and collisions)
BCM1L
8 pCVD diamond detectors
leakage current monitor
integrated in beam abort system
BCM1F and BCML share mount carriage
Run 2011 & 2012
high reliability
very stable (4 faults causing dumps)
redundancy for lumi calc. system

8. BCM
Results from run 2011 & 2012
use of BCM1F as luminometer is feasible
backup as online luminosity monitors

9. BCM
Results from run 2011 & 2012
BCMS signal decreases due to radiation
efficiency decrease is correlated with neutron flux
With CASTOR
Without CASTOR

10. BCM >> CVD Diamonds
Radiation induced damage causes polarisation
efficiency decrease

11. BCM >> CVD Diamonds
Radiation induced damage causes polarisation
efficiency decrease
Compensation
increase HV
Reactive Ion Etching (RIE)
change of HV polarisation
red light

12. BCM upgrade Increase of BCM1F channels to 48
bisected BCM1F sensors. Less susceptible to pulse pile up
greater geometric acceptance for background monitoring
greater pre-amplifier gain
better SNR
faster pre-amp shaper …

13. BCM >> PLT installation of PLT during LS1
dedicated stand-alone luminosity monitor for CMS
Pixel Luminosity Telescope consists of 3 layers of 8 single-crystal diamond pixel sensor
measure bunch-by-bunch 3-fold coincidence rate
pixel readout for tracking and diagnostics

14. BCM >> Data readout
Work during LS1
maintenance of existing front and backend electronics
installation and change of hardware
move of readout electronics to the service cavern
installation of additional cables
adaption of the readout electronics to the new setups
development and implementation of new software codes

15. Conclusion many interesting talks large variety of different topics
presentation of hardware, data read out and software issues
upgrade and optimization plans for LS1
All talks and slides:

16. Thank you for your attention!
Conclusion
many interesting talks
large variety of different topics
presentation of hardware, data read out and software issues
upgrade and optimization plans for LS1
All talks and slides:
Thank you for your attention!

17. BCM >> CVD Diamonds
Radiation induced damage causes polarisation
efficiency decrease

18. BCM upgrade Increase of BCM1F channels to 48
bisected BCM1F sensors. Less susceptible to pulse pile up
greater geometric acceptance for background monitoring
greater pre-amplifier gain
better SNR
faster pre-amp shaper …