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CALICE WHCAL testbeam at SPS H8

CALICE WHCAL testbeam at SPS H8. 27 sep – 03 oct : 6 days for energies up to 180 GeV (+ polarity). Setup. Current HCAL setup has 38 W layers. Including active material this is ~4.8 λ. TCMT: Steel /scintillator-strip sandwich calorimeter with 16 layers (~5.5 λ ).

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CALICE WHCAL testbeam at SPS H8

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  1. CALICE WHCAL testbeamat SPS H8 • 27 sep – 03 oct: 6 days for energies up to 180 GeV(+ polarity)

  2. Setup Current HCAL setup has 38 W layers. Including active material this is ~4.8 λ TCMT: Steel/scintillator-strip sandwich calorimeter with 16 layers (~5.5 λ) Erik van der Kraaij, CERN LCD

  3. Repairs before the run • Week before the run, Ivo Polak came to help tune the Calibration and Monitoring Board #20 • Six boards however have to be taken out to reach #20. • After tuning we retested all  all OK. • Weekend before the run, Kurt Francis helped with the tailcatcher • MIPs for TCMT strips • Gains • Mapping problem Erik van der Kraaij, CERN LCD

  4. TCMT mapping Erik van der Kraaij, CERN LCD

  5. TCMT mapping Best guess why the map is wrong: there are 2 different boxes for cabling Erik van der Kraaij, CERN LCD

  6. TCMT mapping - fixed Erik van der Kraaij, CERN LCD

  7. Muonsamples For MIP calibration and TCMT mapping: In the days before & after our beam time, we scanned the full surface in 9 positions.> 200k muons in each position. Erik van der Kraaij, CERN LCD

  8. High energy hadron program Got help from Ilias & Simon on better beam files Took 200k events at: • 180, 150, 120, 100 GeV (secondary beam) • Took 400k events at: • 180, 150, 120, 100 GeV(tertiary beam) • Took 4M events at 60 and 4M at 80 GeV: •  ~ 100.000 Kaon events at each energy. Secondary beam runs September vs July Erik van der Kraaij, CERN LCD

  9. Low energy program Friday 6 pm -Saturday 8 am: got wobbling set to 50 GeV(with 80 GeV for ATLAS in H6) • Pion samples (200k each) at 30 & 50 GeV • Electron samples (200k each) at 15, 20 and 30 GeV • For the electron runs at 15 & 20 GeV, took sample with & without all scintillators along the beamline • Perhaps an explanation for the long tails we see in June/July samples. With scint. Without scint. Erik van der Kraaij, CERN LCD

  10. Problems during run Saturday morning TCMT 1B started drawing high current on the SiPM. • Replaced total FE board  Did not help. • Other monitoring tools looked fine did not touch it anymore. • Forgot to restart LEDs at this point • 3 gain runs (2 days) are empty. For three runs layer #33 suddenly gave too many hits and too high energy response. • Do not know why… Restarted these runs. • Not related to LEDs being off, it also happened a day before TCMT problem. Erik van der Kraaij, CERN LCD

  11. Conclusion • Beam operation went well, got help for better focussing. • Detector repairs before run were successful • Some malfunctioning during run: • TCMT 1B • Layer #33 • We completed full 2011 program. • 11 M events in pion runs. • 2.2 M eventsin dedicated muon runs. • 1.1 M eventsin electron runs. Erik van der Kraaij, CERN LCD

  12. Temperatures • From the T3B team we got a device with 21 Pt_1000 temperature sensors, easily read out via USB. • Placed these on a 1 m2aluminium plate  slided in the free slot #39;Goal is to obtain temperature profile over the surface, vs time. We see the day/night fluctuations, but variations among sensors is max 0.6 °C. • The free slot might be too far from electronics  We’re repeating this measurement now in slot #20. Erik van der Kraaij, CERN LCD

  13. Backup

  14. TCMT Front End board 39B Saturday morning TCMT 1B started drawing high current on the SiPM. • Unplugged all cables • Replaced several FE chips • Nothing worked. After this, could also not configure chips anymore. •  Replaced total FE board μA • Could reconfigure again, high current remains. • All other monitoring tools looked fine.  did not touch it anymore. • Unfortunately forgot to reset LEDs for AHCAL! • The 4gain runs from this point on are empty… (2 days) Erik van der Kraaij, CERN LCD

  15. HCAL layer #33 μA For three runs layer #33 suddenly gave too many hits and too high energy response. • Do not know why… Restarted these runs. • Not related to LEDs being off, it also happened a day before TCMT problem. Erik van der Kraaij, CERN LCD

  16. CMB #20 fine tuning • Week before the run, Ivo Polak came to help tune the Calibration and Monitoring Board #20 • Via LEDs a CMB sends light to the tiles for calibration. • #20 never functioned properly since installation at CERN • Each of the 11 LEDs has a potentiometer to be tuned. LED #8 could not be tuned, light intensity fluctuated • Six boards however have to be taken out to reach #20. • After tuning we retested all six • #20 now finally sees light: for ~70% of channels the gain can be extracted • No significant effect on other 5 modules. Erik van der Kraaij, CERN LCD

  17. TCMT MIP peaks The weekend before the run, Kurt Francis visited CERN and helped with the tailcatcher. • Extended AngleTrackFinder to find mips in TCMT • extrapolate track to TCMT and allow +- 1 strip • Additional quality cuts • Consider only hits which form a tower of at least 5 in the TCMT alone • Some channels give nice results, however still have the MIP peak very close to the pedestal Erik van der Kraaij, CERN LCD

  18. First night – secondary beam 200k events at 180, 150, 120 and 100 GeV. Compared to same energies (but negative polarity) runs of July  • Linearity is good • Higher energies of new run are probably due to lower temperatures Erik van der Kraaij, CERN LCD

  19. TCMT MIP peaks Erik van der Kraaij, CERN LCD

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