FCAL Workshop in Cracow

1
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 Readou
t Concepts Systematics of Luminosity Measurement
More realistic and detailed LumiCal Simulations
Position Monitoring and Displacement Neutrino
Physics
2
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

• Uncertainties in BHLUMI (S. Jadach)
• - vacuum polarisation (precision improving)
• - photon radiation (may be improved in future)
• At ILC we have a Luminosity spectrum needs
  better understanding
• how to tackle this!

3
Diamond sensor studies

• 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

• 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 ..

4
Beam Diagnostics

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

Hardware developments, position monitoring

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

5
The priority one issues

• LumiCal and BeamCal highly compact calorimeters
  (small RM, confined
• Showers)
• BeamCal - rad. hard sensors
• - fast readout, digitisation,
  processing
• LumiCal - high mechanical precison
• - mum alignment
• - interplay with theory
• - sensor quality, readout
• - novel technologies

6
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? .
7
Technicalities

• - LC Notes, please write down your results
• Web Page and mailing list
• http//www-zeuthen.desy.de/ILC/fcal/
• Send email to sympa_at_desy.de with subject
  subscribe fcal-collaboration Firstname Lastname
• -Next Meeting

8
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)