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Fast BLM acquisition system

Fast BLM acquisition system. Bernd Dehning CERN BE/BI Plots are taken from: Tobias Baer, Henrik Janson , Maria Hempel , Elena Castro, Christoph Kurfuerst. Content. The diamond detector CERN installations Specification Signal versus time Arrival time histogram Acquisition systems.

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Fast BLM acquisition system

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  1. Fast BLM acquisition system Bernd Dehning CERN BE/BI Plots are taken from: Tobias Baer, HenrikJanson, Maria Hempel, Elena Castro, ChristophKurfuerst Fast BLM acquisition system, B.Dehning

  2. Content • The diamond detector • CERN installations • Specification • Signal versus time • Arrival time histogram • Acquisition systems Fast BLM acquisition system, B.Dehning

  3. Beam loss sensors Risetime: 2.34nsFalltime: 10.34nsAmplitude: 397mVBackground noise:9.9mVTemporal width: 6.06ns 50 nsbunchspacing IC Diamond PM (ACEM) • Response time: 100 ns < nsns • Pulse duration: 100 us5 nsfew ns • Dynamic 9 orders9 orders3 orders • Radiation tolerance 100 MGy several 10 MGy 100 kGy • Volume 1l 0.1 cm3 100 cm3 Signal degradation factor 10 Leakage current CVD detector superior in terms of response time, pulse duration and dynamic range MGy Often it is the case that the acquisition chain is limited by the sensor; diamond sensor (CVD) exploitation requires high performance electronics Max 20 pA Fast BLM acquisition system, B.Dehning

  4. BLMED Installation Overview • Following detectors are foreseen to be installed during LS1 and LS2: • 1 detector for Fast Servo spill in the SPS TT20 (LS1) • 1 detector for HiLumi in the LHC (LS1) • 8 detectors for Booster dump (LS2) • 10 (12) Detectors for PS (LS2) Fast BLM acquisition system, B.Dehning

  5. Location of Diamond Detectors at CERN Accelerators 5 31.10.2012 Status and Application of Diamond BLMs; B.Dehning

  6. Location of Diamond Detectors at CERN Accelerators 6 31.10.2012 Status and Application of Diamond BLMs; B.Dehning

  7. Optical diamond detector (BCM1F4LHC) • All detector signals arrive at the same position • Easy access of data acquisition system • Lower dynamic range Fast BLM acquisition system, B.Dehning

  8. Tunnel set ups CIVIDEC system Optical fibre CMS DESY/Zeuten system 8 31.10.2012 Status and Application of Diamond BLMs; B.Dehning

  9. Technical Specification of Fast DAQ Fast BLM acquisition system, B.Dehning

  10. Specification • Sampling frequency, bandwidth • 500 MHz analogue bandwidth relates to a rise time of 0.7 ns (10 – 90%) • Rise time observation 2.3 ns, limited by 1GHz sampling frequency and cable, rise time contribution from analogue part of acquisition almost negligible Fast BLM acquisition system, B.Dehning

  11. Signal versus time acquisitions Fast BLM acquisition system, B.Dehning

  12. Diamond Measurement 4 batches 4·36 bunches LHC injectiongap SPS injectiongaps 36 bunches

  13. Diamond Measurement 1 batch 36 bunches All bunchescontributetothe beam losses, asexpectedfor a macroparticleinteraction. 50ns spacingbetweenbunches

  14. Event Sequence • Start of B1 losses in IR7. Fire MKD.B2 Losses in IR7 No IR5 bb kick IR5 IR4 IR6 0 1/8 3/8 8/8 turns IR3 IR7 IR2 IR8 IR1 Pacmanstructureof beam losses.

  15. Event Sequence No IR2, IR1, IR8 bb kick • Losses due touncaptured beam in abortgapduringMKD rise time observable in IR7. Dumplosses Fire MKD.B2 Losses in IR7 No IR5 bb kick IR5 IR4 IR6 0 1/8 3/8 6/8 8/8 IR3 IR7 IR2 IR8 IR1

  16. Event Sequence No IR2, IR1, IR8 bb kick • Losses due touncaptured beam in abortgapduringMKD.B1 rise time observable in IR7. Fire MKD.B1 Dumplosses B2 dumped Dumplosses Fire MKD.B2 Losses in IR7 No IR5 bb kick IR5 IR4 IR6 0 1/8 3/8 6/8 8/8 10/8 IR3 IR7 IR2 IR8 IR1

  17. Bucket counting on consecutive turns MKI UFO dump which illustrates the timing. The data is acquired by the IR7 diamond BLM for B1. The yellow line shows the losses during the last turn incl. the spike due to the MKD rise time. As reference in red the losses around the abort gap in the previous turn. One can see that the losses which are observable in IP7 occur about 875ns after the beginning of the abort gap and about 1.8us after the last bunch. Fast BLM acquisition system, B.Dehning

  18. CNGS - SPS extracted pulse • SPS 5 ns bunch structure measureable with 150 m of Cu cable 10 us 5 ns Fast BLM acquisition system, B.Dehning

  19. Ring BLM Measurements • Spatiallossprofile • UFO Location: BSRT.05L4.B2Temporal lossprofile B1 B2 Diamond BLM UFO location B2 direction On thefollowingslides: MeasurementswithBMLED.06R7.B2I10_TCHSS.6R7.B2. 40dB signalamplification.

  20. Diamond Measurement Overview 1 turn Losses due to beam dump

  21. Diamond Measurement 1 turn 1 turn Losses due to beam dump Beam abortgap 4·36 bunches 2·36 bunches

  22. Bunch by bunch tune measurement • The data was taken during the EOF test of the beam-beam MD on 13.12.2012, where B2 was dumped first, which led to a coherent oscillation of B1 due to the missing LRBB deflections. • The frequency resolution is limited, because the losses were acquired for only ~200 turns. The duration of recording (1s) determines the required memory size (IEC team, T. Pieloni) Fast BLM acquisition system, B.Dehning

  23. Arrival time histogram referenced to revolution period Fast BLM acquisition system, B.Dehning

  24. HERA Scraping Beam with Wires wire ~ 4 sig begin fill Inner wire • HERA • Bunch spacing 96 ns • Samples taken every 21 ns • No coasting beam halo • 3 samples with zero intensity (left, top) • Partially coasting halo • Inter bunch samples measure intensity (left, middle) • Only coasting halo • No observation of bunch structure (left bottom) • Strong coasting component at begin of fill (centre top) • Bunched halo only minutes later (centre, middle) • With retracted wire diffusion of coasting component into cleaned area (centre bottom), SPS • Effect caused by RF system noise, faulty amplifier wire ~ 4 sig Outer wire 4 min later Halo Intensity wire ~ 6 sig Outer wire wire retracted 24 LMC 10.02.2010 B.Dehning

  25. Arrival time histogram IP5 CMS system With 25 ns spacing and debris from the IP spacing reduced to 12.5 s Allows details of bunch spacing Fast BLM acquisition system, B.Dehning

  26. Arrival time histogram with simulated and CVD signal Bunch period signal at input of acquisition system CVD detector signal at input acquisition system Fast BLM acquisition system, B.Dehning

  27. Arrival time histogram during ramp Bunch spacing reduced due to cross talk Sub 25 ns resolution required Fast BLM acquisition system, B.Dehning

  28. Arrival time histogram - Coasting beam and instabilities By continues updated display observation of all bunches possible Fast BLM acquisition system, B.Dehning

  29. Arrival time histogram with the CMS system IP2, 5 and 8 losses from tails and experiment IP4 losses from core of beam Fast BLM acquisition system, B.Dehning

  30. Arrival time histogram & injection losses Before injection Fast BLM acquisition system, B.Dehning

  31. Arrival time histogram & injection losses After injection Fast BLM acquisition system, B.Dehning

  32. Arrival time histogram & injection losses later after injection Clean injection check should also be possible at the PS and SPS Fast BLM acquisition system, B.Dehning

  33. New Diamond Detector Cascade Schemes side tunnel tunnel • Detector signal split in two signal paths (direct and 40dB amplified) • Monitoring of complete dynamic range possible • No need to access tunnel to exchange amplifier for different users Fast BLM acquisition system, B.Dehning

  34. System propositions • 8 - 10 - 12 bit solution possible • 3 – 4 channel per system needed • Splitter and/or optical input • can be separated form DAQ • In case of a modular system more than 4 channel possible • Parallel processing of histogram and loss versus time mode preferable Fast BLM acquisition system, B.Dehning

  35. System Comparison Fast BLM acquisition system, B.Dehning

  36. Fast BLM acquisition system, B.Dehning

  37. CMS system Fast BLM acquisition system, B.Dehning

  38. IP4 abort gap recording Cross talk from other beam dominant Fast BLM acquisition system, B.Dehning

  39. Fast BLM acquisition system, B.Dehning

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