Status of Ecal(s) for ILD

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Presentation transcript:

Status of Ecal(s) for ILD Roman Pöschl LAL Orsay ILD Meeting at LCWS11 at Granada Sept. 2011

Subdetector components IV - Electromagnetic calorimeter Basic Requirements The SiW Ecal in the ILD Detector - Extreme high granularity - Compact and hermetic Basic Choices - Tungsten as absorber material - X0=3.5mm, RM=9mm. λI=96mm - Narrow showers - Assures compact design - Silicon as active material or - Scintillator as active material Ecal designed as Particle Flow Calorimeter R&D within CALICE Collaboration

Detector Optimisation – Number of Layers/Sensitive Material Models under study: 1) A pure SiW Ecal Calorimeter with 20 < N < 30 Layers 2) A pure Scintillator Ecal 3) A hybrid solution e.g. first 20 layers Si with rear part of calorimeter equipped with Scintillator PFA studies for hybrid calorimeter ongoing Both options are implemented into Mokka since long - PFA with silicon well tested already for LOI - PFA with scintillator is well advancing

Technological prototypes Technological prototype to address engineering challenges of detector Construction Collaboration between alternative technologies where possible

R&D for Technological Readiness – Detectors Scint Ecal SiW Ecal - Proof of principle with physics prototypes Solid backup of full detector simulation by beam test data - Robustness of calibration over 6 years (at least proven for SiW Ecal) - Alveolar structures for barrel and end caps First ASUs expected 2011/12 First ASUs since 2009 First tests in 2011!!! Progress slowed down By non-availability of DAQ2 ←. drop our of British groups - Tests of electronics - Test of power pulsing in magnetic field - Interconnection and cooling → planned until summer 2012 - Advanced Wafers Technology in principle at hand but still matter of R&D - Advanced PCBs Ultra thin and Ultra flat - Scintillator strips seems to be available Not clear what can be achieved until time of DBD All is very much funding driven Main sources are French in2p3/ANR and new Japanese ILC funding

R&D for Technological Readiness – Peripherals ~ 3 cm between Ecal and Hcal Need to accommodate - DAQ components - Power supply components - Cooling Issues are addressed and at least we will come up with a list of open issues and proposals how to address these

Embedded electronics - Parasitic effects? Exposure of front end electronics to electromagnetic showers Comparison: Beam events (Interleaved) Pedestal events Chips placed in shower maximum of 70-90 GeV elm. showers - No sizable influence on noise spectra by beam exposure ΔMean < 0.01% of MIP ΔRMS < 0.01% of MIP - No hit above 1 MIP observed => Upper Limit on rate of faked MIPs: ~7x10-7 Possible Effects: Transient effects Single event upsets

Both Ecals are well implemented in Mokka Summary of Ecals - Ecals in s/w baseline Both Ecals are well implemented in Mokka Solid backup by beam test analyses - Input for technology part of DBD All relevant questions are addressed However, anwers driven by available funding and manpower - Some points are already achieved: - Stable calibration (at least demonstrated for SiW Ecal) - No negative impact by embedded electronics (goes beyond Ecal matters) - Large alveaolar structures are about to be constructed

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