1 / 30

Diamond based particle detectors for LHC machine protection

Diamond based particle detectors for LHC machine protection a nalysis of data from Run 1 and detector characterization experiments. Motivation Introduction Ionisation Chamber Beam Loss Monitors ( icBLM ) Diamond Beam Loss Monitors ( dBLM ) dBLM characterization

hoang
Download Presentation

Diamond based particle detectors for LHC machine protection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Diamond based particle detectors for LHC machine protection analysis of data from Run 1 and detector characterization experiments

  2. Motivation • Introduction • Ionisation Chamber Beam Loss Monitors (icBLM) • Diamond Beam Loss Monitors (dBLM) • dBLM characterization • Analysis of LHC dBLM data from run 1 • Specialised experiments with dBLMs at the BTF in Frascati, Italy • Outlook • Conclusion Oliver Stein TE-MPE, olivers.stein@cern.ch

  3. Motivation • The detection of beam losses is important for the safe operation of the LHC and its • pre accelerator complex at CERN! • Beam losses are THE indicator for the existence of an (unacceptable) danger in the accelerators: • Beam instabilities • Orbit offsets • Equipment failures • The installed Beam Loss Monitors (BLM) are implemented in the Beam Interlock System •  Losses above the defined thresholds cause a beam dump! Oliver Stein TE-MPE, olivers.stein@cern.ch

  4. Introduction >>Ionization Chamber BLM • Ionization chambers (icBLM) are used as the standard BLM • N2 filled cylinder (1.1 bar) • 60 cm length • Parallel electrodes (0.5 cm) • 40µs time resolution (half turn of LHC beam) • More than 3600 icBLMs installed icBLM Electrode setup inside an icBLM icBLMs in IP6 Oliver Stein TE-MPE, olivers.stein@cern.ch

  5. Introduction >>Diamond BLM • What happens within 40µs? • New BLM type: diamond based BLMs (dBLM). • 1.5 ns rise time resolution (5 ns FWHM) • Large dynamic range (1 (30) – (1010?) MIPs) E 50 ns Courtesy of M. Hempel Courtesy of M. Hempel Oliver Stein TE-MPE, olivers.stein@cern.ch

  6. Introduction >>Diamond BLM • dBLM should detect fast beam losses during LHC operation and help to understand the underlying loss mechanisms. • Abort gap monitoring • Stable beams • Ramp/squeeze • Injection • Extraction Oliver Stein TE-MPE, olivers.stein@cern.ch

  7. Introduction >>Current status • 14 dBLMs experimentally installed along the LHC. • Diamond type: pCVD (cividec) 10 mm x 10 mm, wire bonded (8@LHC) • Analysis of dBLM data lead to a better understanding of UFO-events • Special dBLMs designed for high particle fluncies were used during damage tests in HighRadMat. • Diamond type: pCVD (civdec) 5mm Ø, clipped • CMS and Atlas are using dBLMs for beam condition monitoring (BCM). Oliver Stein TE-MPE, olivers.stein@cern.ch

  8. Introduction >>Future plans • Making the dBLMs fully operational and improve their usability for Post Mortem checks! •  Additional diagnosticsSteps: • Better understanding of the detector • Detector response (linearity) • Efficiency • Saturation limits • Detection limits • Development of DAQ system Florian Burkart, Oliver Stein, Daniel Wollmann BI, Bernd Dehning et al. Oliver Stein TE-MPE, olivers.stein@cern.ch

  9. dBLM characterization • Analysis of LHC dBLM data from run 1 • Specialised experiments with dBLMs at the BTF in Frascati, Italy Oliver Stein TE-MPE, olivers.stein@cern.ch

  10. Analysis of LHC dBLM data from run 1 >> detector response • (re) analyzingdBLM data from 2011/2012 • Using UFO events for showing linearity • First attempt to compare dBLM signal with icBLM signals from the same event difficult because a lot of uncertainties affect the analysis Scope channel 1 (C1) Scope channel 2 (C2) 40 db 40 db -6 db -6 db Diamond Diamond 20 db 20 db Scope channel 3 (C3) Scope channel 4 (C2) Beam 1 Beam 2 Oliver Stein TE-MPE, olivers.stein@cern.ch

  11. Analysis of LHC dBLM data from run 1 >> detector response • Analysis of UFO signals • Taking data of different signal intensities • Integration of single bunch losses Oliver Stein TE-MPE, olivers.stein@cern.ch

  12. Analysis of LHC dBLM data from run 1 >> detector response Linear? Oliver Stein TE-MPE, olivers.stein@cern.ch

  13. dBLM characterization • Analysis of LHC dBLM data from run 1 • Specialised experiments with dBLMs at the BTF in Frascati, Italy Oliver Stein TE-MPE, olivers.stein@cern.ch

  14. Experiments at the BTF >> Introduction • Characterization of the diamond detectors in at the Beam Test Facility (BTF) at the INFN in Frascati, Italy. • Electron beam at 450 MeV • Adjustable intensity from 1-1010 particles per bunch • Repetition rate 50Hz BTF Oliver Stein TE-MPE, olivers.stein@cern.ch

  15. Experiments at the BTF >> Introduction • Goals: • Voltage scans at different electron intensities for measuring the charge collection distance (CCD) of different diamond detectors (100µm and 500µm) • Response and Limits • Beam time from 14.10.-20.10.2013 (Collaboration with UA9, low intensities) • Detectors: • 3 x 100µm (5 mm ) • 2 x 500µm E E Oliver Stein TE-MPE, olivers.stein@cern.ch

  16. Experiments at the BTF >> Experimental setup Detector setup Rail on X-Z-Table Beam window calorimeter Oliver Stein TE-MPE, olivers.stein@cern.ch

  17. Experiments at the BTF >> Experimental setup Detector holder electron beam Oliver Stein TE-MPE, olivers.stein@cern.ch

  18. Experiments at the BTF >> Experimental setup SMA signal cable Detector/PCB LEMO HV cable electron beam Oliver Stein TE-MPE, olivers.stein@cern.ch

  19. Experiments at the BTF >> Beam profile measurements Medipixinstalled after the pCVD (10 cm) Beam profiles for different intensities: 1000e, 1850e, 2200e 2250e 1850e 1000e sy sx Integration: 100s Integration: 10s Integration: 10s Fitting measured beam profiles with 2D-gaussian: Oliver Stein TE-MPE, olivers.stein@cern.ch

  20. Experiments at the BTF >> Beam profile measurements • Beam size increases with higher intensities • Beam position changes with different intensities • Influence on the measurements? Oliver Stein TE-MPE, olivers.stein@cern.ch

  21. Experiments at the BTF >> dBLM measurements Oliver Stein TE-MPE, olivers.stein@cern.ch

  22. Experiments at the BTF >> dBLM measurements Oliver Stein TE-MPE, olivers.stein@cern.ch

  23. Experiments at the BTF >> dBLM measurements • Large variance of the measured data • Which parameters cause these variances? • Changing beam size between shots? • Changing beam position? • Variation of beam energy 30% 14% Oliver Stein TE-MPE, olivers.stein@cern.ch

  24. Experiments at the BTF >> dBLM measurements Oliver Stein TE-MPE, olivers.stein@cern.ch

  25. Experiments at the BTF >> dBLM measurements Beam setup 2 Beam setup 1 Oliver Stein TE-MPE, olivers.stein@cern.ch

  26. Experiments at the BTF >> data analysis/results • Assumptions: • Gaussian shaped beam • Beam size: • sx: 4.32 mm • sy: 1.57 mm • Max. signal: 75.2 % Oliver Stein TE-MPE, olivers.stein@cern.ch

  27. Experiments at the BTF >> data analysis/results • Sensitivity: • Intensity dependency • Variation of relative beam position • Variation of the beam size Oliver Stein TE-MPE, olivers.stein@cern.ch

  28. Outlook • Continue data analysis (LHC, Frascati) • Request for own high intensity beam time for finalising measurements • Preparation of experiment setup • Improvement of beam diagnostics, beam size, intensity measurements • Stage system • DAQ optimization (speed, scans,…) • Collaboration with BI for LHC-DAQ system Oliver Stein TE-MPE, olivers.stein@cern.ch

  29. Conclusion • Analysis of dBLM data from run1 • Detector linearity shown • Experiments at BTF, Frascati • Detector setup is working • DAQ successfully tested • Data shows variation of detector and calorimeter signals • Measurements at different intensities (low intensities, up to 2000 electrons) • Voltage scans performed •  uncertainties have to be identified •  request for high intensity measurements •  improve beam diagnostics • Preparation/optimization of the experimental setup and DAQ • Analysis of data (LHC/BTF) will be continued Oliver Stein TE-MPE, olivers.stein@cern.ch

  30. Thank You! • Any Questions? Oliver Stein TE-MPE, olivers.stein@cern.ch

More Related