FCAL Workshop in Cracow

W. Lohmann, DESY Bunch charge effects and diff. Bhabha cross section News From Theory and Generator Diamond Sensor Studies Beam Parameter Determination Readout Concepts Systematics of Luminosity Measurement More realistic and detailed LumiCal Simulations Position Monitoring and Displacement

February 13. 2005

Neutrino Physics

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Bunch charge effects

Beamstrahlung and deflection in the bunch Coulomb field change the Bhabha polar angle distribution. (C. Rimbault) The effect in counting Bhabha events is several per mille – we need to control it on the 10 -4 level

News from theory

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Uncertainties in BHLUMI (S. Jadach) - vacuum polarisation (precision improving)

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- photon radiation (may be improved in future) At ILC we have a Luminosity spectrum – needs better understanding how to tackle this!

February 13. 2005 wlo@INP

Diamond sensor studies

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Minsk University prepared a ‘ working lab ’ , detailed study of sensor protoypes started (Igor) Studies of new sensors from FAP: sensors have similar features, but signal drops both with time and absorbed dose – why (Konstatin) Nice and stable response from single crystal (Christian)

LumiCal simulations

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More realistic detector simulations (Bogdan,Michal, Jarek) - 14 bit ADC??

First results from prague (Petr)- becoming part of the game systematics of geometric distorsions (Andrei, Ronen) - LumiCal must be centered around outgoing beam pipe - systematics from different magnetic fields??

Background estimate for four-fermion final states (Mila) - seems we are safe ..

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Beam Diagnostics

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BeamCal is an important tool for Beam diagnostics, first results with realistic detector simulation (Andrei, Christian) -nothing from PhotoCal

Hardware developments, position monitoring

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Progress of the laser displacement system (Wojtek) Discussions on electronics design and sensors, contributions from Alexandre, Hans … wait for the writeup of the experts

February 13. 2005 wlo@INP

The ‘priority one’ issues

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LumiCal and BeamCal: highly compact calorimeters (small R M , confined Showers)

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BeamCal: - rad. hard sensors - fast readout, digitisation, processing

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LumiCal: - high mechanical precison - mum alignment - interplay with theory - sensor quality, readout - novel technologies

February 13. 2005 wlo@INP

Our next Duties

EUDET: -prepare your plans for EUDET, present a talk (take into account the previous page) -let me know, since I have to give a summary Bangalore: two talks for two participnts, - design of the FR, with details about BeamCal - issues of Lumi measurement PRC: -report end of March the young committee: Christian, Mila, Ronen, Vladimir the experienced: Halina, Leszek, WolfgangLa, Woitek WL.

Speaker for the open session: Ronen? ….

February 13. 2005 wlo@INP

Technicalities

- LC Notes, please write down your results Web Page and mailing list http://www-zeuthen.desy.de/ILC/fcal/ Send email to [email protected]

„subscribe fcal-collaboration Firstname Lastname” -Next Meeting with subject: February 13. 2005 wlo@INP

General remark

-It was a perfectly organised meeting -We learned a lot on Neutrino Physics (A Zalewska) Mining, deep underground restaurants ….

thank you, Leszek, Woitek, Anna , Beata, Malgosia.. All the others (M. Jezabek, P. Malecki) February 13. 2005 wlo@INP