1. ILC Detectors and their R&D GDE meeting Frascati
12/2/2018
F. Richard LAL

2. Introduction
Progress in various technologies and the ILC environment (low radiation doses, duty cycle, no hardware trigger) allows to conceive a quasi perfect and cost effective detector
This goal however requires a WW dedicated and coordinated R&D effort to identify priorities and to avoid duplications (the R&D panel)
For some important physics goals, improved performances translate into substantial gains in luminosity which amply justify this effort
12/2/2018
F. Richard LAL

3. ACFA Study

4. ECFA ILC Meeting in Vienna
ZHH
12/2/2018
F. Richard LAL

5. 12/2/2018
F. Richard LAL

6. Energy reconstruction: PFLOW
Method already used at LEP/SLD which needs to be improved
Combines tracking + calorimetry
Key issues:
- geometry (R and L) and magnetic field
- tracking efficiency (pattern)
- density & granularity for the calorimeters
Calorimetry/tracking resolutions are not critical since with ideal PFLOW resolution would be DE/E~20%/√E
-> degradation is due to confusion
12/2/2018
F. Richard LAL

7. Where are we ? Some Caveats: Perfect tracking Z at rest
Mark Thomson ECFA meeting in Vienna
35.8±0.3 %
Some Caveats:
Perfect tracking
Z at rest
12/2/2018
F. Richard LAL

8. HOW DOES PFLOW COMPARES TO STANDARD CALORIMETRY ?
complete law
EJ= a√EJ ⊕ bEJ + c
J.C. Brient
Gandia H1
ATLAS
ALEPH
PFLOW-ILC
Ejet ( GeV)
Ejet ( GeV) a b
c (GeV)
ALEPH
method QPFLOW
0.59
0.6
ATLAS
0.03 H1
0.5
0.05
PFLOW-ILC
0.3
AND the Angular Dependence !!
12/2/2018
F. Richard LAL
* NIM A360 (1994),480

9. Progress on ECAL Requirements for W-Si Calorimeter
Large dynamic range (15 bits)
Auto-trigger on MIP
Low noise << 1 MIP = 40, 000 e-
Hermeticity: no room for electronics !
Electronics ‘inside’ the detector (ADC)
 miniaturisation
Ultra-low power << mW/ch
Readout of more than 30 Million channels
W layer
Si wafers
Elec chip
ATLAS LAr FEB 128ch 400*500mm 1 W/ch
Physics Proto. 18ch 10*10mm 5mW/ch
ILC : 100µW/ch
12/2/2018
F. Richard LAL

10. Tracking
On top of efficiency one needs momentum accuracy to observe inclusively ZH (Z into leptons)
This can be obtained with Si or Si+TPC
Note that TPC resolution with RO µmegas and GEM is improved / LEP and SLD
12/2/2018
F. Richard LAL

11. results: resolution vs Z
V. Lepeltier
σ(mm)
Carleton Ottawa TPC
π+ beam E=80V/cm
12/2/2018
F. Richard LAL
preliminary

12. Can we still improve ? There is continuous progress on µelectronics
One can conceive much higher granularities
using RO technologies used for pixels
Examples: ECAL and TPC
Are they possible, are they useful ?
12/2/2018
F. Richard LAL

13. K. Moenig
12/2/2018
F. Richard LAL

14. InGrid Integrate GEM/Micromegas and pixel sensor Digital TPC
J. Timmermans
Integrate GEM/Micromegas and pixel sensor
‘GEM’
‘Micromegas’
By ‘wafer post processing’
Hex / Pillars
4” wafer
19 different fields of 15 mm Ø
2 bonding pads / fields
November 16, 2005
Hidden pillars : No dead area

15. Digital TPC M. Hauschild dE/dx @ 2.5% ??? ...at the ILC...
100 GeV muon, B = 4 T, TESLA-TDR gas, 100 cm drift
identical events: same generated primary clusters/electrons
Freiburg triple-GEM set-up
NIKHEF MicroMegas set-up
12/2/2018
F. Richard LAL

16. Not discussed (and equally important)
µvertex with very challenging issues for
the minimum radius of the beam pipe and
the occupancy of the 1st layer (MDI issue)
Si layers with the hot debate on the actual material
The forward region with the crossing angle
issues
LEP accuracy issues
12/2/2018
F. Richard LAL

17. The Detector Concept Document
In parallel to the R&D activity we need to develop a global view of an ILC detector
This is indispensable:
- To determine the geometry of a detector
based on the physics performances requested
- To understand the interface with the machine parameters
- To evaluate the cost of an ILC detector
This is been done by 3 (+1) international
groups will deliver outline documents at LCW06
12/2/2018
F. Richard LAL

18. The 3 concepts Reasonably diversified approaches GLD LDC SiD 12/2/2018
F. Richard LAL

19. Some issues after Vienna
Improve the software tools to evaluate detector performances
-> Few software workshops planned
Improve our connection with machine
experts (LEP, backgrounds, Xssing angle
issues…) MDI panel
-> Hope that the ECFA meeting in Oct-Nov
2006 will coincide with a GDE meeting
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F. Richard LAL

20. Conclusions
Very active ongoing effort on detectors and their R&D (>200 people in Vienna)
Very substantial effort on R&D ( with still unbalanced financing between regions)
Crucial impact of the detector on the overall ILC performance (integrated luminosity figures)
We think that connection Detector/Machine is essential
12/2/2018
F. Richard LAL