Octobre 17 2006 MPI Munich

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

Octobre 17 2006 MPI Munich

The new IR scheme

Octobre 17 2006 MPI Munich

Detector hall

Beam Delivery for

two IPs

Octobre 17 2006 MPI Munich

accessible during run (rad worker)

accessible during run (GERT)

not accessible during run

The push-pull option

fence

Platform for electronic and services (~10*8*8m). Shielded (~0.5m of concrete) from five sides. Moves with detector. Also provide vibration isolation.

Octobre 17 2006 MPI Munich

The next calendar dates

EUDET annual meeting Oct. 18-20

ECFA workshop, November 6-10

ACFA WS, Beijing, February 2007

We have to report about our results after the first year, and to write a report

Draft (final) of the DCR (will be published end of 2006 together with the machine RDR)

prepare ourselfs, FCAL meeting before?

LCWS,Hamburg, June 2007

Octobre 17 2006 MPI Munich

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

Octobre 17 2006 MPI Munich

Current design (Example LDC, 14 mrad):

Luminometer

BeamCal

TPC

ECA

L

HCAL

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

Technology: Tungsten/Si (C)

sandwich

Octobre 17 2006 MPI Munich

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

Octobre 17 2006 MPI Munich

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

Octobre 17 2006 MPI Munich

A few topics to be thought

Electron detection efficiency:

Algorithm relies on constant bunch charge

Look on Dumping Rings

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

Octobre 17 2006 MPI Munich

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

Octobre 17 2006 MPI Munich

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 !

Octobre 17 2006 MPI Munich

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…

Octobre 17 2006 MPI Munich