Status of ASIC readout for Electromagnetic Calorimeter

Elmaddin Guliyev

Laboratoire Leprince-Ringuet, Ecole Polytechnique, Palaiseau, Francefor the CALICE Collaboration

International Linear Collider, the experiment for electron-positron at TeV Scale, will allow to perform crucial study such as; Higgs boson, super-symmetric particles, physics of top quark ...

Particle Flow Algorithm1

requires a fine granularityCalorimeter.The Electromagnetic Calorimeter (ECAL) is a crucial part of ILD. ECAL detector uses tungsten layer as a absorber and developed 18x18 cm2 HAMAMATSU silicon pixel (size 5x5 mm2) sensor will be employed as a light sensors.

Test setup with single ECAL prototype – consist of 4 ASIC, silicon pixel sensor, detector interface (DIF), Link data aggregator (LDA) and clock control card CCC.

DIF - communication the ASIC with data acquisition (DAQ), controlling LDA - aggregate the output of DIF and derive the signal to PC CCC - start/stop DAQ

Signal processing for ASICSKIROC

- analog waveform at the output of the

pre-amplifier andthat at the output of the shaping amplifierwere observed using the monitor linesby injecting a charge.

For the charge (energy)information thegenerated signalfalling edge positionedin to the maximum ofsignal out of shaper unit.

The hold signal can help to digitize thethe amplitude of analog waveform as a energy information, baselineto study the noise level.

Prototype for high granularity ECAL developed

The feature of ASIC performed with injected charge and electron beam

Achieved signal to noise ratio is satisfied

Noise level is almost same for all the channel (in 4 ASIC) and there is

no correlation observed.

CONCLUSIONS

ASIC readout – concept developed due to requirement of physics program. The requirements are:

* Small size* Low noise* Low power* Large dynamic range * Large number readout channels

Prototype SKIROC2

64 channelDual gainDynamic range:0.5 – 2000 MIP (minimum ionizing particle)

Reference: [1] M.Thomson:detectors for a future Lepton Collider : cern 18/2/2010[2] omega.in2p3.fr

Results – is measurement of noise level, linearity with injecting charge and 3 GeV electron energy.