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CERN Test beam (part II) Erika Garutti, Fabrizio Salvatore

CERN Test beam (part II) Erika Garutti, Fabrizio Salvatore. Beam instrumentation description. beam. 500 m. * all in mm. 3x3. hodoscope. m trigger. 10x10. News on the beamline 1) beam info from CERN database available from run 330411

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CERN Test beam (part II) Erika Garutti, Fabrizio Salvatore

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  1. CERN Test beam (part II) Erika Garutti, Fabrizio Salvatore CALICE collaboration meeting, Prague 2007

  2. Beam instrumentation description beam 500 m * all in mm 3x3 hodoscope m trigger 10x10 News on the beamline 1) beam info from CERN database available from run 330411 2) Cherenkov operated for e/p and p/p separation 3) 3 x/y pairs of MWPC with double readout 4) amplitude r/o of 1cm thick scint. counter (20x20 inner_veto) + outer_veto with 20x20 cm hole to tag double particle 5) 10x10 cm trigger only (no 3x3) 6) hodoscope installed for initial muon runs and from ECAL chip irradiation to end CALICE collaboration meeting, Prague 2007

  3. the veto counter 10 GeV e- run 20x20 cm2 veto counter amplitude readout available only from run 330924 on possible cut veto < 7000 ADC ch for analysis use analog readout in crate / slot / fe / chip / chan : 172 / 12 / 4 / 0 / 17 CALICE collaboration meeting, Prague 2007

  4. the outer veto rate : 10x10 trigger 1500 pps OR of outer counter AND 10x10 50 pps in binary files: bit 5 & 6 = 10x10 trig coincidence bit (1 or 2 or 3 or 4)&(5&6) = veto in LCIO files: ifVetoXY(), X=D, U (Down, Up) Y=L, R (Left, Right) CALICE collaboration meeting, Prague 2007

  5. Clean-up examples events cut by no-outer-veto OR events cut by inner-veto Ampl<7000 ADC ch. maybe interesting event selected (?!) with outer-veto CALICE collaboration meeting, Prague 2007

  6. 11 m long gas vessel H6B PMT the Cherenkov counter • Cherenkov bit available from run 330250 on as bit 13 in binary files • isCherenkovTrigger() == 1 (0) for electrons (pions) in LCIO files • normally used for e tagging at E < 30 GeV • from run 331269 to 331463 the Cherenkov gas was changed from He to N2 • achieved p/pi separation !!! for these runs • isCherenkovTrigger() == 1 (0) for pions (protons) in LCIO files H6A beam CALICE collaboration meeting, Prague 2007

  7. N2 Pressure [bar] Pressure [bar] He HCAL ECAL Cherenkov ON = pions Cherenkov OFF = protons min. pressure 10 20 30 10 50 100 beam E [GeV] beam E [GeV] 1 mip-like particle Pion/Proton separation proton threshold pion threshold CALICE collaboration meeting, Prague 2007

  8. MWPC alignment cable mapping alignment performed by CERN survey group CALICE collaboration meeting, Prague 2007 * all units in mm

  9. MWPC performance • this year much better collimated beam • also at low energy • 6-10 GeV still broad distribution • beam impact point tuned by shift crew • differences ~ 1cm from run to run CALICE collaboration meeting, Prague 2007

  10. the hodoscope provide 1 additional x-y point between last MWPC and ECAL from 14th August readout from the DAQ CALICE collaboration meeting, Prague 2007 correlation hodoscope_X / MWPC_X and hodoscope_Y / MWPC_Y

  11. Detector performance Total data taking time 7 weeks SPS uptime 80.7 % Beam controlled by H6B 76.1 % (94.4 % of uptime) DAQ on beamData 60.2% (79.1 % of beam in H6B) DAQ on calibration 7.8 % CALICE collaboration meeting, Prague 2007

  12. e- e+ chip test ECAL plots made on shift with online analysis tool (thanks Allister) NO corrections applied CALICE collaboration meeting, Prague 2007

  13. 80GeV hadrons at ECAL (0,+3) The hadron passes the ECAL (almost) undetected and generates showers in the HCAL A gap effect? ECAL noise known effects of noisy layers and pedestal fluctuations also this year CALICE collaboration meeting, Prague 2007 pedestal fluctuation during one run (slot 19, run 330774)

  14. from Roman analysis ECAL chip irradiation 5 position scan for each of the 4 chips on the special ECAL slab -90 GeV electron beam used ~1.2 M events per chip CALICE collaboration meeting, Prague 2007

  15. AHCAL p- p+ 10o 20o plots made on shift with online analysis tool NO corrections applied runs < 330231 marked as odd HCAL longitudinal profile CALICE collaboration meeting, Prague 2007

  16. runs < 330231 high energy points will determine the constant term CALICE collaboration meeting, Prague 2007

  17. muon calibration muon in HCAL 20 deg 10 deg 0 deg noise stable @ ~ 5 mip CALICE collaboration meeting, Prague 2007

  18. current and temperature jump of 300 uA ?! large temperature variations: ~ 0.5 K day-night > 4 K over 3 weeks  to be accounted in SiPM calibration slow increase of 10 uA CALICE collaboration meeting, Prague 2007

  19. HCAL current map at 10 V bias all currents should be = 0 uA • possible cause: single SiPM (out of 108 connected) with short circuited CALICE collaboration meeting, Prague 2007

  20. TCMT TCTM always operational LED system was off after stage rotation 180 GeV pion strong HCAL-TCMT correlation CALICE collaboration meeting, Prague 2007

  21. DAQ performance 120 Hz limit of DAQ out of spill 90 Hz limit of DAQ in spill limited by beam rate CALICE collaboration meeting, Prague 2007

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