FCAL Workshop in Munich

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FCAL Workshop in Munich
W. Lohmann, DESY
The 14 mrad X-angle, two IPs The push-pull
option The next calendar dates Where we are with
FCAL
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The new IR scheme

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Detector hall
Beam Delivery for two IPs
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The push-pull option
Platform for electronic and services (1088m).
Shielded (0.5m of concrete) from five sides.
Moves with detector. Also provide vibration
isolation.
accessible during run (rad worker)
fence
not accessible during run
accessible during run (GERT)
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The next calendar dates
EUDET annual meeting Oct. 18-20
We have to report about our results after the
first year, and to write a report
ECFA workshop, November 6-10
Draft (final) of the DCR (will be published end
of 2006 together with the machine RDR)
ACFA WS, Beijing, February 2007
LCWS,Hamburg, June 2007
prepare ourselfs, FCAL meeting before?
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Where are we with FCAL
-We worked out an advanced design for several
crossing angles, 2, 20, 14 mrad -this design
is part of the LDC, (partly also for SiD, GLD)
concepts -we got an encouraging statement by the
PRC -we have new members and extended our scope
GamCal to analyse photons (welcome Bill
Morse) -we founded a Collaboration -we are part
of EUDET, EUROTEV However many questions still
not answered
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Current design (Example LDC, 14 mrad)
Luminometer
TPC
HCAL
ECAL
BeamCal

• -Background on
• LumiCal ?
• Background in the
• inner Detector?

Technology Tungsten/Si (C) sandwich
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A few topics to be thought
Selection of Bhabha events
Energy selection cut

• At which energy this cut has to be put?
• Theoretical uncertainty
• Energy scale uncertainty

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A few topics to be thought
The Bhabha cross section depends on the
polarisation

• How well is this understood?
• -higher order corrections
• considered in the Monte Carlo

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A few topics to be thought
Electron detection efficiency
Look on Dumping Rings

• How stable is this mechanism?
• Bunch-to-bunch fluctuations
• (Contact to machine people )

Algorithm relies on constant bunch charge
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Simulations

• Progress
• -GEANT4 simulation of LumiCal, new geometry
• -4f background in LumiCal
• -Beam-diagnostics with GamCal, BeamCal
• Topics
• - GamCal design
• - Reconstruction of Bhabha events from clusters
• - How influence radiative effects for a given
  detector
• the uncertainty of the measurement
• - Optimised segmentation/structure for LumiCal
• - Realistic readout scheme,
• - More realistic BeamCal simulation
• - Backscatterd background

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Sensors and Readout

• Progress
• -testbeam studies performance as a function of
• the absobed dose, for the first time done
• up to a few MGy
• - Laser alignment
• - first experience with the Phy3 chip
• - First experience with GaAs, very soon large
  prototypes
• Topics
• -continue studies of diamond sensors, GaAs
• -Si sensor studies (to learn to work with them).
• -Assembly of full sensor planes ? prototype test.
• -Readout electronics design for the prototype
• O(1000) channels.
• -Concept for the readout electronics -very
  critical issue !

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This meeting at MPI

• -Reports on many topics mentioned
• -Discussions on critical issues
• -More responsibilities to subgroups
• (simulation, electronics, sensors)
• -periodic reviews of milestones (PRC,
• EUDET)
• -conferences, LC notes, publications

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