Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 1 CALICE Summary of 2006 testbeam for the ECAL Anne-Marie MAGNAN Imperial College London On behalf of the CALICE-ECAL Collaboration

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 2 Content 1. Introduction Briefly, what does the ECAL look like ?? The three 2006 test beam periods and their objectives 2. Data taken > 5 TBytes on disk, 65 million physics events 3.Electron and hadron events A few event displays. 4. Noise issues A perfect detector would be amazing ! 5. Conclusion A successful experience

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 3 200mm 360mm The Electromagnetic Calorimeter prototype ECAL prototype: 30 layers of variable thickness of Tungsten Active silicon layers interleved Front end chip and readout on PCB board Signals sent to DAQ W layers wrapped in carbon fibre 3 modules with different tungstene thickness, total = 24 X 0. PCB+Si layers:8.5 mm 62 mm 6x6 1x1cm 2 Si pads Conductively glued to PCB Active area of 12*18 cm 2 now completed for 30 layers Last year : only 14 layers Last 1/3rd expected in May 2007.

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 4 Overall objective of 2006 beam test for ECAL Characterize detector performances. Test and tune the simulation. Once we trust the simulation  optimisation of the ILC detector. Identify hardware problems to correct them before building the whole so-called EUDET module. Test particle flow algorithms.

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan beam test periods DESY. First cosmic events in the “tent”. Feb May DESY TB area, 1-6 GeV electron beams, with only 24 layers. 14 days in total. July 27th Aug 8th ECAL CERN period : cancelled !! No beam, SPS fault, not ours.... AHCAL+TCMT period : transformed into 5 days ECAL+5 days AHCAL stand alone + 3 days, courtesy of ATLAS, for ECAL stand alone. Combined ECAL+AHCAL + TCMT, with 6cm Aug 25th Sept 6th Oct 11th Oct 30th 500 pedestal events Data taking structure: 500 calibration events 10k beam events 500 pedestal events...etc...

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 6 Tracker: 4 drift chambers ECAL: 24 layers, 5184 channels First tests of ECAL-HCAL combined acquisition DESY TB setup ECAL at 0° : 3 position points Angle scan : 2 position points and angles studied : 10 °, 20°, 30°, 45° For each point : energy scan with 1, 1.5, 2, 3, 4, 5, 6 GeV Aiming at 100k events per sample

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 7 DESY Data Samples  Shower fully contained Garbage and empty events Multi-particle events Energy (mip) per event  Energy and angle scan completed, with ~200k events or more per point.

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 8 CERN installation  Particle ID: Cherenkov counter, 1bit signal  Tracker : 3 XY proportional chambers (MWPC)  Calorimeters : ECAL: 30 layers, 6480 channels HCAL: 15 modules, 3240 channels TCMT: 8 modules, 160 channels

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 9 CERN- August period in figures + 30 Millions of Muon events for calibration.

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 10 A few hadron runs combined with AHCAL and TCMT

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 11 CERN October period Add another 27 Million physics events ! + 42M of muons for calibration + 14M only for HCAL calibration M of HCAL only runs M “only” dedicated to beam tuning Detail of the 27 M: - Another 3.8 M dedicated to electron studies between 6 and 50 GeV - And 23 M of hadronic events between 6 and 80 GeV

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 12 Electron runs  One point overlap with DESY TB at 6 GeV. Electron combined runs E (GeV)e+ (kEvts)e- (kEvts)

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 13 Combined pion runs E (GeV)π+ (kEvts)π- (kEvts) Hadron runs With ECAL and HCAL at 6cm from each other this time ! E HCAL vs E ECAL (mip)

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 14 Summary of events Size on disk: ~ 40 kB/evt  65M events = 2.5 TB for CERN Physics runs  + 70 M = 3 TB for muon calibration runs August period October period Sept. break μ calib. runs μ calib.  See Roman’s Talk on Wednesday.

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 15 Electron showering in the ECAL

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 16 An hadronic event 10 GeV pion event, taken Oct 16th 2006

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 17 A few problems, “of course” 1.Pedestal instabilities : results in “noisy” layers, with a correlated noise over a whole PCB of up to 50% of a MIP !!! –Not understood yet ! Currently investigating on an hardware point of view. –A preliminary procedure to correct this effect event by event is applied in the data reconstruction, but need further studies. –the pedestals are measured at periods throughout the run so this effect can be tracked. –This concerns only less than 3 PCBs over “Square events” : appearence of hits around some wafers, in the guard ring zone.

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 18 Pedestal instabilities... Ex: Muon run (ECAL threshold : 0.5 MIP) Noise A Good PCB A PCB with unstable pedestals

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 19 “Square” events... Proportion of events concerned : high energy data (electrons 45 GeV) : ~4% low energy data (electrons 3 GeV) : <

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 20 Conclusion A successful experience !! Lots of data taken, stable detector running, people on-site to solve the problems as soon as they appeared. Electron data samples from 1 to 50 GeV ready for analysis. Further plans : TB in May-June next year (currently in negotiation with CERN) with possibility to rotate both ECAL and HCAL+TCMT. + Fermilab with AHCAL in fall 2007, and DHCAL in winter 07/08.

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 21 Thank you for your attention.

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 22 CERN installation Muon 1 Muon m beam Beam instrumentation: 1) ~500 m beam line after Be trg = magnets, collimators, secondary trg, abs 2) Cherenkov detector for e/  separation < 40 GeV 3) 3 x/y pairs of Multi Wires Proportional Chambers (MWPC) with double readout, multi-hit capability 4) veto counter, r/o analog amplitude, to separate multi-particle events 5) trigger system 2) 3) 4) 5) are integrated in the DAQ and read out event by event 3x3 10x10  trigger * all in mm π event

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 23 DESY installation

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 24 View of an ECAL board

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 25 Beam quality DESY

Thursday, November 7th ECFA meeting - Valencia - A.-M. Magnan 26 The data taken CERF period: parasitic muon high intensity, wide distribution  Very important for calibration !!! All what was collected in the ECAL run: 60 GeV secondary beam, tested e GeV and  GeV. Combined run, goal: ECAL EM program - e GeV, from 50 GeV beam, with 0,10,20,30 deg - small samples of  GeV too large distance ECAL-AHCAL AHCAL stand alone, ECAL removed GeV secondary beam tested  / e 6,10,15,20 GeV GeV secondary beam e GeV and p GeV !!! large fraction of time invested in beam tuning !!!  3 additional days “courtesy” of ATLAS: AHCAL and TCMT out of beam line, ECAL re-installed for high statistics low energy runs (thanks to all voluntary shifters) up to 10 million events in one day!