Irfu contributions to LHC

1
Irfu contributions to LHC
participation in Atlas/CMS and LCGand EMC2
program
Thanks to all the colleagues who helped
preparing these slides!
2
Building LHC
Major contributions to the LHC, Atlas, CMS and
Alice since the very early days!

• contributions over the last 20 years
• about 1000 FTE for construction since 1998
• currently 40 permanent physicists participating
  and post-docs and students

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LHC quadrupoles 2 beams in 1 magnet

• Complete design of the twin quadrupoles with
  assembly in helium vessel
• Complete prototyping including test and magnetic
  measurements
• Industrial follow up of the 400 SSS in
  partnership with IN2P3 and CERN

4
CMS Solenoid the most powerful magnet

• cold mass design in Saclay
• successfully powering up the magnet in 2006

CMS reinforced conductor
5
CMS detector
15 permanent physicists 13 engineers and
technicians from SEDI

• Hardware implications
• Calorimeter monitoring system for crystal
  transparency - crucial for energy resolution

• SRP selective read-out processor intelligent
  0-suppression for the calorimeter

Analysis of test beam results since 1996
achieves design performance
6
CMS research areas

• Natural implication H???
• technical expertise optimization of calorimeter
  reconstruction, em-cluster search
• first benchmark prompt photon production with
  the first LHC data

• Towards H ?4l
• Di-boson production WZ (150 pb-1) ZZ (1fb-1)
• searches for anomalous couplings
• irreducible background for Higgs or SUSY
  production

Higgs ?tt control channel vs discovery
channel enhanced contribution in some
SUSY models expertise from similar
searches at DØ at the Tevatron
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ATLAS AT from Saclay
Concept of air toroid born in 1988 in Saclay
? intense collaboration between engineers and
physicsts for mechanical, and thermal calculations
Mechanical supports
Cold Mass Integration
Cryostat Integration
Individual coil test and barrel toroid test
8
ATLAS detector contributions
Conception and realization of optical alignment
system for the barrel µ-system comprises 5833
optical lines more than 95 commissioned and
working

• Some results
• After installation sagging of the toroid 17mm
  measured/18mm expected
• since then continuous monitoring
• Powering deformation 2mm

Providing the magnetic field map from the
measurement to the reconstruction 1800 Hall
probes aim precision of 1mT
Nominal Fitted
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ATLAS accordion calorimeter

• Important technical contribution to design,
  management and construction
• Assembly of 12/32 modules in Saclay

• Contribution to calorimeter electronics
• HAMAC read out chip (in collaboration with
  Lal-Orsay) including developpement of SCAs used
  also in Antares, HESS, T2K.
• Tower builder electronics for L1 trigger an L1
  cabling

10
ATLAS software contributions

• µ-reconstruction muonboy package was chosen
  to be the official Atlas package
• statistical combination of the muon spectrometer
  measurement and the measurement of the tracking
  system
• ?used for soft lepton b-tagging

electron reconstruction topological clustering
improved performance w.r.t fixed clusters in
test beam data
contributions to French computing Grid Tier 2
center in the Paris area and local Tier
3 Participation in MC production and
infrastructure training
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ATLAS from SM to exotics
20 permanent physicists engineers and
technicians from SEDI, SIS, SACM

• W,Z physics differential ds measurements ?
  basic knowledge to understand any process at LHC
• MW developing innovative method for high
  precision measurement

Top physics (s, mt) crucial for understanding
background, jet calibration and providing further
constraints on Higgs
Searches for Z ? µµ possible  early 
discovery channel, expertise in µ-reco
Search for H?4l will require at least 3 years of
data taking
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Future Proton Accelerators
Present accelerators
Future accelerators

• Roadmap for Proton Accelerators for the Future
  (PAF working group)
• First step construction of Linac 4 (normal
  conducting 160 MeV H-) Contribution to RFQ
• Possibilities participation for SPL Design, RD
  for high field magnets and sLHC

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RD for detector upgrades

• Participation in RD51 CERN initiative since
  September 2007 to unite RD on Micropattern
  Gaseous Detectors world-wide.
• not only for LHC, also contributions from ILC,
  Neutrino- and Nuclear Physics, Industry and other
  communities.
• IRFU Saclay has expertise in Micromegas and
  electronics for MPGDs.

Other already successful contributions in this
area CAST, Bulk Micromegas, TimePix (with NIKHEF)
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Contributions to LHCG
Irfu
Contribution of 15 to Tier 1 at CC-Lyon
15
EMC2 Program

• So far only American visitors have been received
• Toni Liss (2007-2008)
• To come
• Jason Nielsen (Santa Cruz)  June-September 2008
• John Butler (Boston Univ) Septembre 2008 Mai
  2009
• Jianming Qian (Michigan at Ann Arbor) Septembre
  2008-Septembre 2009
• We would be delighted to also welcome Japanese
  visitors!
• Possible extension for co-direction of PhD thesis?

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Concluding remarks

• Strong implication in LHC program -
• we all hope now for a rich harvest and new
  discoveries
• Its nice to harvest together further
  collaboration on physics topics?
• Contributions to LHC upgrades and beyond
  participation in accelerator and detector RD
  programs
• Links and collaboration are existing, it will
  be nice to see them further grow!