the CALICE test beam set-up and running experience Erika Garutti (DESY)

The CALICE mission Final goal: CAlorimeter for the LInear Collider Experiment Imaging calorimeter Final goal: A high granularity calorimeter optimised for the Particle Flow measurement of multi-jets final state at the International Linear Collider Scint. Strips-Fe TCMT Intermediate task: Build prototype calorimeters to Establish the technology Collect hadronic showers data with unprecedented granularity to - tune clustering algorithms - validate existing MC models Si-W ECAL Scint. Tiles-Fe AHCAL E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

ECFA workshop - Valencia - 7-11 Oct 2006 Not to scale moves to CERN Si-W ECAL 30 cm H6b test beam area in Prevessin Scint. Tiles-Fe AHCAL “…end of June ’06 the CALICE collaboration is packing up 3 calorimeter prototypes from DESY (D) and NIU (US). Destination: Geneva. Expected duration of the mission: 4 months. ” Scint. Strips-Fe TCMT 110 cm E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

Running time granted / given Some numbers: total data taking time = 36 days granted / 21 days given people on shift ~50 (from all institutes in CALICE) beam duty cycle (during running time) ~ 60% detector up time > 90% (including ECAL + AHCAL + TCMC + DAQ) m + One major de-installation during ATLAS run in H6C 2 periods with different detector installation: Aug.-Sep. – technical installation Oct. – installation for physics m We are here m E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

The Detectors Installed The Si-W ECAL: 30 layers of W with variable thickness (~1l) only “upper” two wafer rows equipped The A-HCAL, Scintil. Tiles+SiPM r/o: (15) 23 active layers ~4 l (out of 38 planned) ~5000 channels Aug. installation : coarse segmentation Slabs with 6 Si wafers with 6x6 pads each Oct. installation : fine segmentation 2 cm steel plates ~6500 channels see G. Geyken talk The Tail Catcher (TCMT), Scintil. Strips+SiPM r/o: fully equipped with 16 layers ~5.5 l SiPM = 320 channels 2 / 10 cm steel plates see B. Lutz talk E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

The physics installation ECAL Tail Catcher HCAL Compact installation aimed to tuning of clustering and MC comparison: <10cm between calorimeters, minimum dead material E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

Installation challenges Commissioning of part of the detectors during CERN test beam Commissioning of AHCAL LED monitoring system (see I. Polak talk) First integration of ECAL+HCAL and TCMC Installation geometry optimized on the spot Installation of fast networking / high speed data transfer 1 Gbit switch to CERN, 20Mbyte/s to DESY (see R. Poeshl talk) The noise “fight” ECAL noisy slabs (see A.-M. Megan talk) Modification of HCAL/TCMT VFE electronics (see S. Schaetzel talk) Integration of beam instrumentation E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

ECFA workshop - Valencia - 7-11 Oct 2006 The SPS H6 Beam Line Primary beam: p 450 GeV on Be targ. (T4)  secondary beam: e,m,p,p , 6-200 GeV Beam intensity: up to 108 particles / spill, we used 1-3kHz beam rate Secondary beam pion: no sec. target, Pb absorber to filter electrons Tertiary beamelectron: 3 mm Pb target, no absorber (lower intensity)  responsibility of the users to tune correctly 500m of beam optics and optimize secondary or tertiary beam operation CALICE installation SPS H6 beam line horizontal plane Absorber sec.target vertical plane E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

The CERN setup …much more than “just” 3 calorimeters 3x3 10x10 m trigger beam 500 m Steps towards a clean physics data sample: 1) Optimize beam  tune magnets, collimators, secondary trg, abs 2) Separate e/p  Cherenkov detector (for Ebeam < 40 GeV) 3) Itentify beam impact point on ECAL  3 x/y pairs of MWPC with double readout 4) Tag multi-particle events  amplitude r/o of 1cm thick scint. counter (veto) 5) trigger physics with high efficiency  trigger system  Store event by event info from 2) 3) 4) 5) in the common DAQ * all in mm E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

The data taken (1st period) Courtesy of G. Mavromanolakis parasitic muon calibration: - before and after main data taking periods high intensity (DAQ @ max rate, 130Hz) wide distribution (1x1 m2 covered uniformly) high statistics (> 50 M events) AHCAL and TCMT calibrated at various operation voltages E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

The data taken (1st period) e- 45 GeV ECAL @ 10 deg p- 30 GeV ECAL @ 0 deg ECAL em program - Tertiary e- 10-45 GeV, from 50 GeV beam - ECAL rotation: 0,10,20,30 deg small samples of p 30-80 GeV too large distance ECAL-AHCAL (technical run!!) Courtesy of G. Geyken E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

The data taken (1st period) Total amplitude in HCAL EM program in HCAL: establish calibration and corrections for understood phys. processes and using established MC e- 10-45 GeV Courtesy of M. Groll AHCAL stand alone, ECAL removed - 1 day @ 10 GeV secondary beam tested p / e 6,10,15,20 GeV - 3 days @ 50 GeV secondary beam e 10-45 GeV and p 30-80 GeV  uncorrected linearity curve E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

The energy grid (2nd period) In addition: 42 M ev muons for calibration 14 M ev calibration (pedestal, SiPM gain, SiPM saturation scans …) For a total of > 5 Tbyte data on the DESY dCache / GRID ready to be analyzed E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

ECFA workshop - Valencia - 7-11 Oct 2006 Impressive data rate Shower from a 40 GeV p+ Courtesy of R. Pöschl The physics is there  Now starts the fun !! E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

Courtesy of G. Mavromanolakis The tools for data taking the online monitor Real time display of data and detector quality essential during beam tuning high performance as tool for the shift crew Beam profile in x coordinates from 3 MWPC Total energy deposited in ECAL 6 GeV pion beam Cherenkov ON = electron tag Cherenkov OFF = hadron tag Correlation ECAL/HCAL energy 20 GeV p+ / p- 10 GeV p+ / p- ONLINE PLOT Uncorrected No PID selection E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006 Courtesy of G. Mavromanolakis

The tools for data taking the slow control AHCAL slow control : control SiPM voltages and LED monitoring system r/o relevant monitor par. collect beam parameters send all to the DAQ Used as a test bench for the project of Global Accelerator Network Multipurpose Virtual Laboratory E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

Encountered “problems” Beam / trigger quality During 1st run period: too many multi-particle events ~ 5-10% level can (mostly) be removed offline More time invested in beam tuning understanding and optimization Improved beam quality in the 2nd run period e- 20 GeV E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006 Courtesy of V. Morgunov

Encountered “problems” Temperature gradient in AHCAL During 1st run period max temperature gradient (day/night) 2 oC uniform temperature within the detector layers 2nd run period: more AHCAL layers compact electronics, with less air flow few days after 2nd installation 8 oC longitudinal temperature gradient SiPM amplitude changes as dA/dT = -5%/oK installed cooling fans near VFE electronics temperature stabilized within 2 oC still day/night fluctuations, but manageable E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

ECFA workshop - Valencia - 7-11 Oct 2006 Conclusion MC REALITY DATA A calorimeter CONCEPT for the ILC is gaining FORM and CONTENT !!! E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006

Outlook / Plan for next run Next installation with: fully commissioned detectors - 38 layers AHCAL - all bottom slabs in ECAL movable stage for AHCAL  hadronic showers from 0o to 30o Also wanted: Pion / proton separation Low energy hadrons (< 6 GeV ?) The analysis of the data taken will tell us if we “missed” something Very good connection established with the CERN team Proposal submitted for May 2007 for another CERN test period … FermiLab is next at the end of summer 2007 E. Garutti ECFA workshop - Valencia - 7-11 Oct 2006