cern test beam (part ii) erika garutti, fabrizio salvatore
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
E. Garutti CALICE collaboration meeting, Prague 2007 1
CERN Test beam (part II)
Erika Garutti, Fabrizio Salvatore
E. Garutti CALICE collaboration meeting, Prague 2007 2
Beam instrumentation description
500 m
beam
3x310x10 trigger
* all in mm
News on the beamline1) beam info from CERN database available from run 330411 2) Cherenkov operated for e/and/p separation3) 3 x/y pairs of MWPC with double readout4) amplitude r/o of 1cm thick scint. counter (20x20 inner_veto) + outer_veto with 20x20 cm hole to tag double particle5) 10x10 cm trigger only (no 3x3)6) hodoscope installed for initial muon runs and from ECAL chip irradiation to end
hodoscope
E. Garutti CALICE collaboration meeting, Prague 2007 3
the veto counter
10 GeV e- run
for analysis use analog readout incrate / slot / fe / chip / chan : 172 / 12 / 4 / 0 / 17
possible cut veto < 7000 ADC ch
20x20 cm2 veto counteramplitude readout
available only from run330924 on
E. Garutti CALICE collaboration meeting, Prague 2007 4
the outer veto
rate : 10x10 trigger 1500 ppsOR of outer counter AND 10x10 50 pps
in binary files:bit 5 & 6 = 10x10 trig coincidencebit (1 or 2 or 3 or 4)&(5&6) = veto
in LCIO files:ifVetoXY(), X=D, U (Down, Up)
Y=L, R (Left, Right)
E. Garutti 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 eventselected (?!) withouter-veto
E. Garutti CALICE collaboration meeting, Prague 2007 6
the Cherenkov counter
Cherenkov bit available from run 330250 on as bit 13 in binary filesisCherenkovTrigger() == 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
beam
H6B11 m long gas vessel
PMT
H6A
E. Garutti CALICE collaboration meeting, Prague 2007 7
He
beam E [GeV]
Pre
ssur
e [b
ar]
beam E [GeV]
Pre
ssur
e [b
ar]
10 20 30 10 50 100
min. pressure
N2
Pion/Proton separation
pion threshold proton threshold
ECAL HCAL
Cherenkov ON = pionsCherenkov OFF = protons
1 mip-like particle
E. Garutti CALICE collaboration meeting, Prague 2007 8
MWPC alignment
MWPC TDC# TDCchannel#
1-left 0 0 1-right 0 1 1-down 0 2 1-up 0 3 2-left 0 4 2-right 0 5 2-down 1 0 2-up 1 1 3-left 1 2 3-right 1 3 3-down 1 4 3-up 1 5 * all units in mm
alignment performed by CERN survey group
cable mapping
E. Garutti CALICE collaboration meeting, Prague 2007 9
MWPC performance
this year much better collimated beamalso at low energy
6-10 GeV still broad distribution
beam impact point tuned by shift crew differences ~ 1cm from run to run
E. Garutti CALICE collaboration meeting, Prague 2007 10
the hodoscope
correlation hodoscope_X / MWPC_X and hodoscope_Y / MWPC_Y
provide 1 additional x-y point between last MWPC and ECAL
from 14th August readout from the DAQ
E. Garutti CALICE collaboration meeting, Prague 2007 11
Detector performance
Total data taking time 7 weeksSPS 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 %
E. Garutti CALICE collaboration meeting, Prague 2007 12
ECAL
plots made on shift with online analysis tool (thanks Allister)NO corrections applied
e- e+
chiptest
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ECAL noise
pedestal fluctuation during one run (slot 19, run 330774)
80GeV hadrons at ECAL (0,+3)The hadron passes the ECAL (almost) undetected and generates showers in the HCAL A gap effect?
known effects of noisy layers and pedestal fluctuations also this year
E. Garutti CALICE collaboration meeting, Prague 2007 14
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
from Roman analysis
E. Garutti CALICE collaboration meeting, Prague 2007 15
AHCAL
plots made on shift with online analysis toolNO corrections applied
- +
10o 20o
runs < 330231 marked as odd HCAL longitudinal profile
E. Garutti CALICE collaboration meeting, Prague 2007 16
runs < 330231
high energy pointswill determine the constant term
E. Garutti CALICE collaboration meeting, Prague 2007 17
muon calibration
20 deg10 deg0 deg
muon in HCAL
noise stable @~ 5 mip
E. Garutti CALICE collaboration meeting, Prague 2007 18
current and temperature
jump of 300 uA ?!
slow increase of 10 uA
large temperature variations:~ 0.5 K day-night> 4 K over 3 weeks to be accounted in SiPM calibration
E. Garutti 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
E. Garutti CALICE collaboration meeting, Prague 2007 20
TCMT
180 GeV pionstrong HCAL-TCMTcorrelation
TCTM always operational
LED system was off afterstage rotation
E. Garutti CALICE collaboration meeting, Prague 2007 21
DAQ performance
90 Hz limit of DAQin spill
120 Hz limit of DAQout of spill
limited by beam rate