F. Richard 11/27/091 Detectors for future LCs ECFA meeting at CERN F. Richard LAL/Orsay.

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Detectors for future LC’s

ECFA meeting at CERN

F. Richard LAL/Orsay

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Outline Introduction Recent evolutions on detectors (IDAG) Illustration of LC physics from the LoI’s Which scenario ? R&D activities Collaboration CLIC ILC Future workshops CERN LC10 Conclusions

Introduction In August 2009 an international panel (IDAG) has

validated two detector concepts SiD and ILD An overall strategy has been defined by the research

director (RD) S. Yamada in consultations with SiD & ILD, with the partners on R&D, on MDI (push pull) etc.. to meet the detailed design goal for the 2 detectors end of 2012 in conjunction with the TDR for the machine

There is increased participation of CERN on detectors for the future LC following the DG vision of a LC CERN project embedding the two proposed technologies

This major step, endorsed by ILCSC, is meant to avoid duplication of efforts in particular for the detectors and to unite the LC community

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The IDAG process IDAG is an international panel (appointed by ILCSC+RD)

comprising 16 members (experimentalists, theorists, machine experts) and chaired by M. Davier

It went in great detail through the 3 LoIs proposed for the ILC pogram (CERN has signed them) in tight connection with the teams

ILD & SiD based of PFLOW were validated while IDAG recommends continuing R&D on dual RO calorimetry studied by the 4th concept

ILD and SiD have important differences (size, tracking) but similar calorimetry at the present stage

This could change if dual RO methods are validated through the R&D effort

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6620 5500

ILD SiD

77

55

62

00

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Push pull

Importance of push-pull aspects (also for CLIC) which will be studied in detail by ILD & SiD

Why 2 detectors ? Scientific arguments (competition, independence,

confidence on results) Complementarity with contrasting technologies (OK if data

can be combined) Risk mitigation: allows for high performance detectors with

reasonable risks (e.g. failure with a large SC Coil) ‘Sociological’: a worldwide project needs to accommodate

a diversity of cultural approaches …

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Both detectors on platform

LC physics LC physics was realistically illustrated by LoIs with

full simulation & full reconstruction, including background effects in the ILC environment

Excellent s/b and accuracy is confirmed within SM or SUSY

Discovery could proceed through direct observation but recall that LC precision (as for LEP but much better) allows to test scales well beyond ECM in certain scenarios (e.g. Z’, extra dimensions)

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Reference reactions

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ee->Z*->HZ

The recoil mass technique with Z->µ+µ- gives a very clean signal at √s=MH+110 GeV

Works even if H decays into invisible or complex modes

ZZH coupling constant determined to ~1%

In the SM case most BR ratios known 10 times more precisely than at LHC

Higgs still visible s(HZ) if 1/10 SM

ILD

Full Simulation

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Top at LC LC 1 pb, LHC 1nb but with larger uncertainties Very good s/b at ILC and energy conservation allows to

reconstruct modes with a neutrino (cleaner modes, AFBt) Mt and Gt with 50 MeV error, 0.4% on cross section Polarisation & AFBt allows to separate tR from tL (extra

dimensions)

An open scenario

The light Higgs scenario cannot be guaranteed and LHC/Tevatron results may change our ideas based on MSSM/SM

These uncertainties justify an open scenario recalling however that ILC 0.5-1 TeV is the shortest path

We need to be ready to adapt to what happens at LHC and decide accordingly

ILC will extend its studies to 1 TeV physics and CLIC will explore up to 3 TeV

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Detector R&D A major activity, well coordinated by large international

collaborations, the largest being CALICE on calorimetry: 336 physicists/engineers from 57 institutes and 17 countries from the 4 regions

CERN has joined the largest R&D collaborations While there is proof of principle of the various

innovative technologies we need to enter in the phase of technological prototypes with realistic cooling, power pulsing, material budget

Excellent training ground to maintain ‘high tech’ within HEP and provide data for young physicists

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R&D organisation Test beams at CERN, DESY, FNAL etc.., have been

actively used to test proof of principle prototypes while in the next step technological prototypes, e.g. ECAL supported by EUDET, will have integrated electronics, cooling etc..,

R&D is well supported in Europe EUDET->AIDA with connections to s-LHC

An issue, in the absence of a world laboratory housing ILC activities, is the international monitoring of the detector R&D

So far the PRC of DESY has played a very useful role

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CLIC and ILC CLIC aims at a CDR in 2010 after establishing a

proof of principle by CTF3 and at a TDR ~2016 for a 3 TeV project with a 500 GeV 1st step

ILC has provided help and tools to develop a CLIC detector concept

ILD and SiD (with increased size) are viable at 3 TeV with thicker calorimeters (8 LI )

Two issues however: time structure and increased background at higher energies

At 3 TeV gg interactions deposit ~25 GeV every 0.5 ns with impact on jet reconstruction

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CLIC and ILC Key aspects: time stamping in µvertex (Si3D ) and

forward calorimetry For instance ILD assumes 25 µs (~30 bunches) time

integration at µvertex while CLIC should aim at ~10 ns Note also that the excellent collaboration with CLIC

extends to MDI+Engineering with the help of CERN experts (LHC detectors, with very active participation from CMS engineers)

While the spontaneous collaborative approach seems to work very well, some overview is needed and a ILC-CLIC working group is being organized in agreement with the RD and ILSSC

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Workshops So far there is unification of workshops for the GDE and

CLIC Typical attendance at Albuquerque (NA) and CLIC09 at

CERN ~250 participants with large overlap Unification on detectors was revived at the ECFA

workshop in Warsaw (2008) and will be amplified at the CERN LC workshop

This workshop (September 2010) is organized with CERN participation at parity in the program Committee

If successful (heavy organization>400 expected large number of // sessions) could be generalized, on detectors, to the 2 other regions

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Conclusions There is rapid progress towards 2 realistic LC detectors

confronting push-pull constraints New physics studies produced by the LoI’s with detailed

simulation/reconstruction and backgrounds studies confirm excellent LC performances on top and Higgs physics

Overall LC strategy leaves open the final choice awaiting for first LHC results

R&D on detectors is a priority and works well in Europe CLIC-ILC collaborations on detectors are rapidly developing on

R&D and design of detectors for mutual benefits Next ECFA LC workshop will take place at CERN end of 2010 and

should illustrate the good spirit of worldwide collaborations on the future LC

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BACK UP

SLIDES

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CLIC 3 TeV main parametersCenter-of-mass energy CLIC conserv. CLIC Nominal

Total (Peak 1%) luminosity 1.5(0.73)1034 5.9(2.0)·1034

Repetition rate (Hz) 50

Loaded accel. gradient MV/m 100

Main linac RF frequency GHz 12 (NC)

Bunch charge109 3.72

Bunch separation ns 0.5

Beam pulse duration (ns) 156

Beam power/linac (MWatts) 14

Hor./vert. norm. emitt (10-6/10-9) 3 / 40 2.4 / 25

Hor/Vert FF focusing (mm) 10/0.4 8/0.1

Hor./vert. IP beam size (nm) 83 / 2.0 40 / 1.0

Soft Hadronic event at IP 0.57 2.7

Coherent pairs/crossing at IP 5 107 3.8 108

BDS length (km) 2.75

Total site length (km) 48.3

Wall plug to beam transfer eff. 6.8%

Total power consumption (MW) 415

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LC 500 GeV Main parametersCenter-of-mass energy ILC CLIC Conserv. CLIC Nominal

Total (Peak 1%) luminosity 2.0(1.5)·1034 0.9(0.6)·1034 2.3(1.4)·1034

Repetition rate (Hz) 5 50

Loaded accel. gradient MV/m 33.5 80

Main linac RF frequency GHz 1.3 (SC) 12 (NC)

Bunch charge109 20 6.8

Bunch separation ns 176 0.5

Beam pulse duration (ns) 1000 177

Beam power/linac (MWatts) 10.2 4.9

Hor./vert. norm. emitt (10-6/10-9) 10/40 3 / 40 2.4 / 25

Hor/Vert FF focusing (mm) 20/0.4 10/0.4 8/0.1

Hor./vert. IP beam size (nm) 640/5.7 248 / 5.7 202/ 2.3

Soft Hadronic event at IP 0.12 0.07 0.19

Coherent pairs/crossing at IP 10? 10 100

BDS length (km) 2.23 (1 TeV) 1.87

Total site length (km) 31 13.0

Wall plug to beam transfer eff. 9.4% 7.5%

Total power consumption MW 216 129.4

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Z’