1. BDIR/MDI Summary ECFA Final Plenary
C.Grah
ILC ECFA 2006
Valencia, 10th November 2006

2. Beamdiagnostics in the Forward Region of the ILC Detectors
14mrad
Energy deposition at BeamCal front face
14mrad DID
Resolution by single parameter reconstruction
14mrad antiDID
Parameter
Unit
Nom. μ σ σx nm
655
653.89
2.27 σy
5.7
5.395
0.229 σz μm
300
299.83
4.11
Observables
Δ BeamPar
Taylor
Matrix
nom
= *
10-Nov-2006
C.Grah: BDIR/MDI

3. GamCal Complementary information from beamstrahlung photons and
beamstrahlung pairs
ratio E_pairs/E_phot scales with luminosity
Idea for the technical
implementation
B.Parker
10-Nov-2006
C.Grah: BDIR/MDI

4. Status of IP Fast Feedback Prototype
Kicker
BPM 1
BPM 2
BPM 3 e-
FONT4
Drive
amplifier
Analogue BPM
processor
In fabrication
Digital feedback
P.N.Burrows
Time of flight kicker – BPM:
Signal return time BPM – kicker:
Irreducible latency: ns
BPM processor:
ADC/DAC ( MHz cycles)
Signal processing (8 357 MHz cycles)
FPGA i/o
Amplifier
Kicker fill time
Electronics latency: ns
Total latency budget: ns
FONT Test Module for ESA
10-Nov-2006
C.Grah: BDIR/MDI

5. 14 mrad Extraction Line 14 mrad extraction line
0.5 TeV CMS
Performance of Energy Spectrometer and Polarimeter Meets Goals
1 TeV CMS
Large background from scattered synchrotron radiation photons at the Cherenkov Detector
Concern about large beam losses for Low Power beam parameters
2 mrad extraction line investigated … more concerns.
K.Moffeit
10-Nov-2006
C.Grah: BDIR/MDI

6. Precise ILC Beam Energy Measurement using Compton backscattering
ΔEb/Eb = 10-4
and infrared Nd:YAG laser (EL = eV)
 Δd = 5 μm !
L = 50 m
photons
center of gravity, σγ
1 mrad θ
250 GeV beam d
weak dipole
edge electrons, Ee=45.8 GeV
edge position, σedge
Non linear effects
Multiple Compton scattering
laser quant e-
Both effects shown not to reduce
the precision!
H.J.Schreiber
10-Nov-2006
C.Grah: BDIR/MDI

7. Four-fermion processes as a background in the ILC luminosity calorimeter
BACKGROUND to bhabha events
ΔL/L = 10-4
by counting
bhabha events
Isolation cuts are
- Acollinearity cut
- Acoplanarity cut
- Relative energy cut
- Energy balance cut
leptonic bck.
hadronic bck.
B/S = / εbhabha = 80.6 %
10-Nov-2006
C.Grah: BDIR/MDI

8. SIMULATION OF BEAMCAL WITH B FIELDS
Moliere Radius ~ 1 cm
0-100 GeV/cm2
Lumi Cal
GeV/ cm2
-7 mrad ent.
GeV/cm2
7 mrad exit
GeV/cm2
GeV/cm2
SiD Beam Cal at z=295 cms
In beampipes
Anti-DiD scale factor = 1.2
U.Nauenberg
10-Nov-2006
C.Grah: BDIR/MDI

9. LowP Option ½ RF power – ½ luminosity:
The LowP option could restore the luminosity to
2x1034 cm-2 s-1 at the cost of:
increased energy spread
(ave E-loss 2.2%  5.7%)
increased beamstrahlung/pair production
Nominal
LowP
vertex charge measurement
-25%
-25%
Recoil mass, GeV
C.Damerell
W.Lohmann
10-Nov-2006
C.Grah: BDIR/MDI

10. Flexibility of the Low Power option regarding the pair background in the microvertex detector at 4T
VD acceptance depends on B, r0, l
LDC : r0 =15mm, l=10cm, B=4T
Low Power
3T Design : not possible to use 15mm radius beam pipe
5T Design : no problem to use 15mm radius beam pipe
Safety Margin reduced
Pair accumulation zone
Deflection limit for Nominal option
C.Rimbault
10-Nov-2006
C.Grah: BDIR/MDI

11. Beam-Induced Backgrounds in the LDC Detector Dirty Business at Low Angles
Origins of backscattered electrons and positrons
which enter the inner parts of the detector
A.Vogel
10-Nov-2006
C.Grah: BDIR/MDI

12. Background study at GLD-IR
Simulation of
GLD forward region
(14mrad solenoid)
T.Tauchi
10-Nov-2006
C.Grah: BDIR/MDI

13. 4-th Concept and MDI issues
Dual solenoid system
Room for second detector
Directional kicker
Valves for push-pull disconnection
FF optics
4th Concept presented their detector concept
and showed their ideas for the integration.
A. Mikhailichenko
10-Nov-2006
C.Grah: BDIR/MDI

14. Changes since Vancouver
Approved:
CCR from 2/20mrad to 14/14mrad, single collider hall
5m muon walls instead of 9+18m
On surface detector assembly
Under Study:
Single IR – evaluation of push-pull
D.Angal-Kalinin/A.Seryi
10-Nov-2006
C.Grah: BDIR/MDI

15. Technical evaluation of push-pull
vacuum connection & feedback kicker
common cryostat
larger detector
larger L*
A.Seryi
10-Nov-2006
C.Grah: BDIR/MDI

16. Technical evaluation of push-pull
Single detector hall and BDS
Movement on airpads (CMS like)
Radiation safety
Tremendous amount of work was done since
end of september.
10-Nov-2006
C.Grah: BDIR/MDI

17. Thanks for your attention!
10-Nov-2006
C.Grah: BDIR/MDI