1 / 19

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 ).

lotta
Download Presentation

CALICE WHCAL testbeam at SPS H8

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. 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

More Related