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CALICE WHCAL testbeam at SPS H8

CALICE WHCAL testbeam at SPS H8. Two testbeam periods 7 days in June: energies up to 50 GeV 7 days in July: energies up to 300 GeV In 2010 a run was taken at the PS T9, with E < 10 GeV. Tungsten HCAL prototype.

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CALICE WHCAL testbeam at SPS H8

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  1. CALICE WHCAL testbeamat SPS H8 Two testbeam periods • 7 days in June: energies up to 50 GeV • 7 days in July: energies up to 300 GeV In 2010 a run was taken at the PS T9, with E < 10 GeV

  2. Tungsten HCAL prototype Main purpose: Validation of Geant4 simulation for hadronic showers in tungsten Current HCAL setup has 38 W layers. Including active material this is ~4.8 λ While being installed in SPS H8 Scintillator tiles 3x3 cm2 (in centre) Read out by SiPM Erik van der Kraaij, CERN LCD

  3. Setting up a beam H8 beam energy is linked to H6 beam energy. • Most of the time we ran with a secondary beam of either +180, -180 or -300 GeV. In the beam line we can produce a tertiary beam at lower energy by inserting a target: • 400 mm Cu target for hadron production • 6 mm Pb target for e+- production. The "hadron" beam is actually a mixed beam consisting of e+, mu+, pi+, p+ • Can be stripped of the e+ with an absorber of 4 mm, 8 mm or 18 mm thick Pb. • The muons can easily be identified and taken out in the offline analyses. Erik van der Kraaij, CERN LCD

  4. Particle identification H8 beam line has two Cherenkov chambers for particle ID. • The information was that they are 100% efficient from 30 mbonwards. • This unfortunately turned out to be wrongWe put the pressure slightly above the pion threshold, to be efficient for electrons (no electrons in the pi sample). • Some 10%-30% of pi in the e-+ sample. Dedicated electron run in second week. Chamber A Chamber B Erik van der Kraaij, CERN LCD

  5. Trigger & tracking setup Two 10x10 cm2 scintillators in coincidence as main trigger 3 delay wire chambers for track reconstruction One thick 20x20 cm2 for vetoing against multiple incoming particles, to be used in offline analysis Erik van der Kraaij, CERN LCD

  6. First event display +180 GeV Erik van der Kraaij, CERN LCD

  7. - 40 GeV event display -40 GeV Erik van der Kraaij, CERN LCD

  8. Beam profile: 20 GeV Wire chamber #3 Wire chamber #1 Wire chamber #2 H V • Very broad & low intensity beam,we could not get it more focused. Scanning the low energies with tertiary beam was extremely slow. • With H6 agreed that for the last day we got control of the secondary beam. Erik van der Kraaij, CERN LCD

  9. Low energy scan – pion runs To change the secondary energy one needs to call the CCC, who sets the so-called wobbling of the magnets to the primary target. • Set it to -20, -30 and -50 GeV • At such low energies, -10 or -25 GeV particles can also be found from the primary target. • With no secondary target the intensity is much higher • Full scan with negative polarity was done in 30 hours! • Total #events taken: ~ 5 Million. Erik van der Kraaij, CERN LCD

  10. Tailcatcher for high energies • Installation started immediately after the end of first week run. • Installed and commissioned in the 10 days available. • Only the LED system for calibration does not function (similar to previous years) Steel/scintillator-strip sandwich calorimeter with 16 layers (~5.5 λ) Erik van der Kraaij, CERN LCD

  11. Trigger setup Two 80x80 cm2cm2 scintillators, one before and one after the calorimeter, are also mounted. Unfortunately not efficient at lower part of detector. • Extended with two 30x30 to scan over full surface for muons. 20x20 cm2with a hole of 8 cm for vetoing, to be used in the offline analysis. Erik van der Kraaij, CERN LCD

  12. DREAM instrumentation still in beamline • The DREAM trigger telescope consists of 6 scintillators. Total of ~5 cm Surrounding material in the beam 5 cm For the second week all this equipment was taken out, and a beampipe installed to obtain better electron beam. Erik van der Kraaij, CERN LCD

  13. Event display including tailcatcher -180 GeV Erik van der Kraaij, CERN LCD

  14. Scanning higher energies With the secondary beam at -180 GeV we set up tertiary beams at lower energies. Rates again too low: • Beam rate @ -100 GeV: 300 counts/spill Unlike first week, there was not the option of setting up wobblings of lower energies. • Tested selecting lower energy particles directly from the secondary beam • Beam rate @ -100 GeV: 3200 counts/spill • Yet this is not how it is supposed to be done at the H8 beamline! • Theoretically, for these high energies, the optics are not able to select particles with different energies immediately from the focal point on the primary target. • As we would never be able to go through our program with 300 counts/spill, we tried it out  Erik van der Kraaij, CERN LCD

  15. Tertiary vs secondary beam Check of secondary beam quality: contamination and energy -100 GeV beam muon electron pion Erik van der Kraaij, CERN LCD

  16. Tertiary vs secondary beam Check of secondary beam quality: energy 1 -100 GeV -50 GeV • Two energy points crosschecked between tertiary and secondary beam • Same energy distribution • Even though it is unclear where the particles originate from (primary target? Inside TAX?), the particles have the correct energy. Erik van der Kraaij, CERN LCD

  17. Pion program • With the unconventional secondary beam, took pion runs with -300 GeV < E < -50 GeV. For all samples at least 600k events. • Many of the runs already reconstructed by Angela! • Distributions are from results obtained in the HCAL only (no tailcatcher yet), selecting showers started in the first layer. • For high energy, deviation from linearity is probably due to punch through T9 Erik van der Kraaij, CERN LCD

  18. Electron program • On Friday an extra vacuum beampipe was installed in the area where LHCb was also in the beam (with a silicon tracker telescope). • Sunday morning we got control again over the wobbling settings. Set it to -20, -30 and -50 GeV. • With the 8 mm Cu target created electron beam at -10, -15, -20, -25, -30, -40, GeV. For each took a sample of 200k events. • As expected, saturation of the SiPM visible: Erik van der Kraaij, CERN LCD

  19. The T3B experiment T3B is positioned behind the CALICE W-HCAL • Measures time development in hadronic shower New trigger system enables • high rate standalone acquisition (10kEv/Spill) • stable oscilloscope synchronization Quite some leakage for > 40GeV  nice for T3B Fractionof Events in which T3B was Hit. All Energies: 10(pink) to 300GeV(darkblue) • T3B took a nice Data Sample Erik van der Kraaij, CERN LCD

  20. The T3B Experiment in CALICE T3B Sensors Online Calibration was a success  All SPS T3B Runs are calibrated: SiPM Gain, Decomposited Wfms, Temperature Information... available • 4 sensors of the Temperature Array Board were located within the TCMT behind layer 2, 8, 12, 16 TCMT Sensors SPS Test Beam quite successful: • T3B took a nice Data Sample • We are looking forward to analyze the data Big thanks to all CALICE WHCAL members Erik van der Kraaij, CERN LCD

  21. Other experiments in H8 - LHCb Most of the time LHCb had their silicon tracker telescope in the beamline. • Were very happy with all the runs that they could join in. • Moved out on Friday morning for the installation of the beampipe for the electron runs. Erik van der Kraaij, CERN LCD

  22. Conclusion • Beam operation took some time to learn, but went very well once understood. • Even with unconventional settings for secondary beam. • Will try to figure out where the particles originate from. • Detector performed well. • Tailcatcherinstalled, commissionedand operational. Except for LED system. • Hardly any intervention needed. • We completed our FULL program. • 14.5 M events in pion runs. • 2.8 M eventsin dedicated muon runs. • 1.2 M eventsin electron runs. • Most samples already reconstructed, first results look good. Erik van der Kraaij, CERN LCD

  23. Thanks to many people! Erik van der Kraaij, CERN LCD

  24. Backup

  25. Wobbling Top view of the end deflection of the beam in the wobbling • As the H8 does not have a horizontal bending magnet, the H8 beam energy is set by the wobbling: Ewobbling. TAX Primary target Erik van der Kraaij, CERN LCD

  26. H8 secondary beam Side view of the deflection of the beam to the surface. Bending magnets B1,B2,B3 and B4, and quadrupoles must be set to Ewobbling to propagate particles up to the North Hall. wobbling Collimators C3 & C9 (horizontal slits, moves vertically) are in the focal points of lenses along the same beamline: act as Δp slits. Erik van der Kraaij, CERN LCD

  27. H8 tertiary beam • Adding a target creates a new spectrometer at lower energies. • Intensity is however 10x too low for us. Would never take enough events in 1 week. Erik van der Kraaij, CERN LCD

  28. H8 spectrometer • What we did: set B1, B2, B3 and B4 and quadrupoles to settings for particles with energies different than Ewobbling. • We do see particles, the question is where they originate from. (primary target? TAX? Vacuum chambers?) wobbling Erik van der Kraaij, CERN LCD

  29. Beam profile: 40 GeV Very broad beam, we could not get it more focused Erik van der Kraaij, CERN LCD

  30. Temperatures • Module 14 has one bad reading, gets replaced by average of two neighboring layers in next reprocessing. • Spread of ~3 degC is typical for this run period and similar to T9. • Plateau in the last layers is not completely understood. The hot weather end June also influenced the temperature in the North Hall: Erik van der Kraaij, CERN LCD

  31. #hits/event distributions • In the #hits /event clear peaks can be seen for different particle types at all energies • This is one example (no normalization applied) Pions/protons electrons muons 25 GeV 25 GeV 30 GeV 40 GeV pedestal Erik van der Kraaij, CERN LCD

  32. Energy distributions • In the energy distributions, after the calibration chain, the electron and pion energies overlap. • Selecting now the events where the low pressure cherenkov chamber did not see a signal, and the high pressure chamber did, we get a pion energy distribution. muons 25 GeV 25 GeV 30 GeV 40 GeV Erik van der Kraaij, CERN LCD

  33. The T3B Experiment in CALICE • T3B Layer is positioned behind the CALICE W-HCAL June/July SPS Test Beam quite successful: • Quite some leakage for > 40GeV  nice for T3B • Smooth operation of temperature array (1 PT1000 sensor for each SiPM + 2 area sensors) CALICE DAQ T3B Layer CALICE AHCAL Erik van der Kraaij, CERN LCD

  34. The T3B Experiment in CALICE • Live Gain Extraction between Spills working.here, OnlineMonitorwithoutpedestalcorrection: Unmodified waveform Reconstruced waveform #hits / 0.8 ns • Waveform Decomposition:Use averaged 1photon Waveform to decompose full signal to single photons time distribution  works  T3B is in good shape Erik van der Kraaij, CERN LCD

  35. T3B data taking • T3B has been running the entire week. Took data stand-alone, sometimes included in our DAQ. • Realized the 26th that this lowers our #ev/spill rate. • Their integration in the DAQ is thus removed, they will match their events to ours in offline analysis. Erik van der Kraaij, CERN LCD

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