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 %

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ECAL

plots made on shift with online analysis tool (thanks Allister)NO corrections applied

e- e+

chiptest

E. Garutti CALICE collaboration meeting, Prague 2007 13

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