FCAL Workshop in Cracow

1
FCAL Workshop in Cracow
W. Lohmann, DESY
The BCD (Baseline Configuration Document) The
next calendar dates Where we are with FCAL
2
The BCD
Executive Committee for Baseline
Configuration GDE Director Barish Regional
Directors Dugan Americas Foster
Europe Takasaki Asia Accelerator
Leaders Yokoya - Asia Raubenheimer -
Americas Walker - Europe Responsible for
decisions and documentation for the Baseline
Configuration Document (BCD)
GDE Executive Committee

3
ILC Parameters
4
The BCD
The Baseline Machine (500GeV)
The 1 TeV upgrade
5
2 Interaction Regions
Two Detectors, because

• Confirmation and redundancy
• Complementary Collider options
• Competition
• Efficiency, reliability
• Historical lessons

We have to contimue with two design options! 2
mrad and 20 mrad
6
GDE groups
Machine design, Cost ..
Siting, civil construction .
Physics, Detectors

• - J. Brau (America)
• F. Richard (Europe)
• H. Yamamoto (Asia)

.
Area subsystem leads
Beam delivery system

• A. Seryi, H. Yamamoto (MDI panel)
• D. Angal-Kalinin

7
The next calendar dates
EUDET kick-off meeting in Hamburg, February
15-17.
We have to present our plan for the next 4 years
LCWS Bangalore, March 9-13.
LDC outline document, presentations
Physics Research Committee, May 11-12
A written report and a presentation are expected
ECFA WS, Valencia, November, 2006
prepare ourselfs, FCAL meeting before?
8
Where are we with FCAL
-We worked out an advanced design for zero or
small crossing angle -this was accepted and
acknowledged in Snowmass and Vienna (Several
talks by H. Abramowicz, K. Afanaciev, C.Grah,V.Dru
gakov, A.Elagin, B. Pawlik, A. Sapronov) -the
performance (resolutions, efficiencies, biasas)
are understood from simulations for partly
realistic detectors -the backscattered background
( into the central detector part) is estimated -
Some studies are done for the 20 mrad version
(beamstrahlung background, systematics of
beamposition)
9
Very Forward Detectors

• Detection of Electrons and Photons at very
  low angle extend hermeticity
  

Beamstrahlung Depositions 20 MGy/year Rad. hard
sensors e.g. Diamond/W BeamCal

• Measurement of the Luminosity
• with precision (lt10-3) using
• Bhabha scattering

• Fast Beam Diagnostics

300 cm
VTX
FTD
LumiCal
IP
L 4m
Silicon/W sandwich
BeamCal
BeamCal
LumiCal 26 lt q lt 82 mrad BeamCal 4
lt q lt 28 mrad PhotoCal 100 lt q lt 400 mrad
RD for ILC (DESY PRC RD 02/01) Instrumentation
of the Very Forward Region of the ILC Detector
10
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

11
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

12
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
13
20 mrad design

• Changes within LDC
• -TPC is shorter
• -HCAL should cover
• smaller angles
• -LumiCal aligned with
• or in front of ECAL
• -Montage-friendly
• -Background on
• LumiCal ?
• Background in the
• inner Detector?

14
What has to be done
We need a design for 20 mrad crossing angle -new
geometry -repetition of many simulations -studies
of backgrounds, beamstrahlung, backscattered
into the central detector

• We have to understand Bhabha phenomenology in
  more details
• -Status of the theory and generators
• - How influence radiative effects for a given
  detector
• the uncertainty of the measurement
• - Optimised segmentation/structure for LumiCal
• - Realistic readout scheme

15
What has to be done

• Sensor and Readout
• -Continuation of diamond studies (more samples
• with promising diagnostics, linearity,
  homogeneity,
• high radiation doses.)
• -Si sensor studies (to learn to work with them).
• -Si sensor radiation test.
• -Assembly of full sensor planes ? prototype test.
• -Readout electronics design for the prototype
• O(1000) channels.
• -Concept for the readout electronics
• -Concept Design for the fast readout and
• fast diagnostics (related to Eurotev).

16
This meeting at INP

• -Reports on many topics mentioned
• -Discussions on critical Issues
• 20 mrad design
• more realistic simulations
• prototyps and testbeam
• electronics concept
• preparation of the EUDET kick-off
• meeting
• Lets make a WORKshop and see at the
• end where well go