Stan Bentvelsen SAC 2008
Atlas program - Stan Bentvelsen - SAC April 17, 2008
1
ATLAS
Muon precision chamber
96 MDT BOL chambers
Semi Conducting Tracker
Installation Endcap
End-cap toroids
In-kind contribution
Trigger/DAQ
Muon Read Out Drivers
Computing readiness
Combined Tracking
Software contribution
Physics performance
Atlas
program Stan
Bentvelsen SAC April 17,
2008
2
Nikhef highlights of the last year

SCT

 Endcap installed
○ after delays due to cooling
problems in the barrel
 All modules tested & functional

 Detector Control System ~ready
 Alignment system operational


 Developed analysis model
 Monte Carlo validation

Performance
 Muon tracking optimization
Muons
 All BOL chambers installed
Computing
 Combined tracking

Physics
 Physics readiness note
activities
Data acquisition
○ Commissioning top-quark
 Muon Read Out Drivers in place
○ One lepton Susy
Endcap Toroids
○ Higgs vector boson fusion
 Installation in Atlas
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Nikhef-Atlas group
 Age profile Atlas group:

16 fte permanent staff
 Geographic location


Amsterdam: FOM & UvA
 13 fte perm staff
Nijmegen: FOM & RU
 3 fte perm staff
 New Atlas members
 Involvement in ATLAS management

Nigel Hessey – Upgrade coordinator
since last SAC

Kors Bos – Computing Operation coordinator
 6 PhD students

Peter Kluit – Convener muon combined performance
 FOM m/v O. Igonkina

Wouter Verkerke – Physics validation coordinator
 4 PostDocs (Atlas, VIDI, VICI)

Patrick Werneke – Technical coordinator SCT endcaps


Atlas program - Stan Bentvelsen SAC April 17, 2008
Stan Bentvelsen – Advisory committee CB
Olya Igonkina – Tau trigger convener
P4
Atlas program - Stan Bentvelsen SAC April 17, 2008
Transport of the End-Cap Toroid
P5
Installation
Lowering the End-Cap Toroid
June 4th & July 11th 2007
Atlas program - Stan Bentvelsen - SAC April 17,
2008
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Semi Conductor Tracker
•6.2 million readout channels
•Barrel
•4 cylindrical layers
•2112 modules
•coverage 0<|η|<1.1-1.4
•‘Sign-off’ completed
in december 2007
•End-Caps
•18 discs
•1976 modules
•coverage 1.1-1.4<|η|<2.5
•‘Sign off’ January 2008
•SCT endcap A assembled & installed
Atlas program - Stan Bentvelsen - SAC April 17, 2008
by NIKHEF!
SCT Barrel
2 meter
SCT End-Caps
7
Installation in Atlas
SCT+TRT endcap installation
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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ATLAS - SCT cosmics

Barrel and Endcaps
 Participation in ATLAS wide
milestone run ‘M6’ early March
 Combined runs show normal
noise in modules and smooth
data acquisition

Cooling problems
 Heater Failure has seriously
delayed the commissioning but
heaters are now in place and
operational.
 Leak in coolingloop may cause a
small loss (<1%) in working
modules (Endcap C)

Cosmics measured in
ATLAS cavern with SCT and
TRT !
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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2007: Installation SCT
Atlas program - Stan Bentvelsen - SAC April 17,
2008
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2007: Installation of Nikhef’s MDT BOL chambers completed!
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Status MDT chambers

All barrel MDT chambers
in place
 Nikhef BOL chambers
operate smoothly
 Problems in power supplies
○ 50% have HV

Routinely taking cosmics
 More than 3 million recent cosmic
events available
 Data processing through central
CERN computing facilities ("Tier 0")
 Nikhef participation
○ This event is taken yesterday
○ 75% have LV

Quality monitoring ok
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Muon Direction Distribution
sector
5A
sector
5C
sector
13A
Atlas program - Stan Bentvelsen - SAC April 17,
2008
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Detector Control System (DCS)

Nikhef heavily involved
in DCS system:
 MDT-DCS module
○ Temperature
○ B-field
○ Front-End electronics
 Alignment
○ Barrel
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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DCS status of muon barrel

Nikhef responsabilities in B- and T- systems
 All T-sensors installed – 98% operational
 B-field sensors tested and intercalibrated at upcoming
magnet test
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Alignment system & Nikhef
Goal: 20 mm mechanical precision

Projective alignment
 Close to finished

Acquisition speed up
 Rate of imaging analyses
increased by factor 100
 Full readout in 15 mins
 370 images analysed/min
Type
Projective
Total
OK
Broken
TBD
117
85
12
20
Axial
1035
998
10
27
Praxial
2006
1938
6
56
Reference
256
232
4
20
CCC
260
234
10
16
32
32
0
0
Inplane
2110
2064
8
38
Total
5816
5589
50
177
BIR/BIM
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Data Acquisition
Olya
Igonkina

All 204 Muon Read Out Drivers installed in USA15
 Input data from 1150 muon chamers
 Output: to 16 ROS PC with 4/5 ROBIns per PC (700 ROBINs in Atlas)
Since last year:

production 255 MRODs


Installation, commissioning


testing, repairing in 15 VME crates
Stable running. Few subtle
problems found & solved
ROBIN’s activities
 firmware upgrades
 The ATLAS ROBIN R Cranfield et al 2008
JINST 3 T01002
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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High level streaming & trigger
•
Routing and Streaming in the Higher
Level Trigger
• Distinguish between physics and
calibration events
• Flexible Routing and Streaming
implementation allows transparent
addition of Remote Online Farms

Responsibility for single tau,
tau+Missing_ET triggers
performance (HLT)


Design of complex, multi-objects
trigger signatures
New Nikhef activity, driven by new
staff member: O. Igonkina
Large involvement of Nikhef
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Muon reconstruction ATLAS

Muon (standalone) reconstruction
 Main contributions to the modular
Moore reconstruction
○
○
○
Pattern recognition
Segment finding
Track finding and fitting
 Substantial improvements
○ Efficiency (low momenta)
○ Efficiency and fake rate in cavern
background events

Combined reconstruction
 ID + MS with Cal energy corrections

Combined muon identification
η
Efficiency Z→μμ with cavern backgrnd
 Calorimeter tag: requiring a m.i.p. in the Hadron Calorimeter
 Muon Segment tagging reconstruction
 Refit of inner detector and MS track
Atlas program - Stan Bentvelsen - SAC April 17,
2008
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Physics readiness activities

Computing Services Commissioning (2007)
 Exercise computing infrastructure for large scale
production of simulated events.
Publish series of notes that give update on
ATLAS physics performance on 100 pb-1 to 1fb-1.
 Separate ‘Analysis Model Forum’ to review
analysis experience of CSC
Menelaos
Tsiakiris


Calibration Data Challenge (2007)
 Calibrate, align detector with ‘data procedure’ on
MC sample
 Tests full chain: procedures, database
infrastructure etc…
Atlas program - Stan Bentvelsen - SAC April 17,
2008
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Computing & Grid

Validation of Simulation, Reconstruction software
 Scope: Event generation, Simulation (full Geant-4, fast
parameterized simulation and hybrid forms),
Reconstruction, derived physics data (TAGS)
 Activities lead by W. Verkerke (Sep 2006 – present),
represented in physics and software management
○ Validated simulation and reconstruction of CSC excerise
(Release 12). Over 50 million events simulation with G4 and
reconstructed with validated software [ done ]
○ Validation of updated G4 software and parameter tuning for
Final Dress rehearsal (Release 13) and first data [done]
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Final Dress Rehearsal

Grid operation
 Kors Bos in Atlas’ computing management
 Operation of computing model with Tier1 and Tier2’s
 From April 2008 new Nikhef colleague for Tier1

Final Dress rehearsal
 Exercise of complete computing infrastructure from Tier0 (ATLAS pit) to
end-user analysis.
○ Mix samples of simulated events into ‘data-like’ sample, simulate trigger,
perform streaming based on trigger info, reconstruct data in Tier-1 centers,
perform users analysis. Do as much as possible in real-time (including
calibration and monitoring)
 Two iterations:
○ FDR-1 (early 2008) participation at Nikhef in end-user analysis
○ FDR-2 (june 2008) participation at Nikhef planned for ‘production-style’ enduser analysis. Build on experience of FDR-1 exercise
Atlas program - Stan Bentvelsen SAC April 17, 2008
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Top physics at commissioning
Top quark pair production at the LHC
Cross-section ~ 800 pb
(440 pb with a high-PT lepton)
signal = 100 x Tevatron,
bckg = 10 x Tevatron
Nikhef interest in top physics:
Early data challenges:
t
- Commission ATLAS detector
in multi-jet final states
- Cross-section measurement
t
Larger data sample:
- Top quark properties (mass, charge, …)
- Search for new physics
(FCNC, SUSY, Mtt-resonances)
Atlas program - Stan Bentvelsen - SAC April 17,
2008
Golden channel
(l=e,μ)
250,000 events/fb-1
23
Top physics: determination σ(tt)
2007/2008: ATLAS physics readiness rapports
Include: Top cross-section, Top trigger, Top properties.
-1
100 pb
ATLAS
100 pb-1
~ 500
events
Mass 3-jet top candidate [ GeV]
SuperSymmetry
Mass 3-jet top candidate [ GeV]
2008: Early data:
- Robust background estimates and calibrations
(JES, trigger, ET-miss, fake leptons, b-tag)
- Ambition: Nikhef will perform the first cross-section measurement
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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VBF: Higgs  W+W-  ll
ATLAS TDR
VBF H  WW

VBF HWW: signifcant discovery potential over wide mass range
 “No-lose” theorem applies to W-W scattering:
 Something must show below mWW < 500 GeV/c2 to avoid unitarity violation.

Great synergy with Z and top reconstruction
Atlas program - Stan Bentvelsen - SAC April 17,
2008
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VBF Higgs: Characteristics
Excellent properties for suppressing background:
 Clean events:
 color-coherence between initial and final state W-radiating quarks  suppressed
hadronic activity in central region

Tagging jets
ATLAS CSC BOOK
 Two forward, high-Pt jets

Spin zero Higgs:
mH(true) = 170 GeV/c2
 charged leptons prefer to point in
same direction.
Work focus:
 Optimization of signal
sensitivity w/ neuro-evolution
 Setup and validation of 5dimensional fit to extract Higgs
candidates, based fully on bkg
control samples.
•
•
background
signal + bkg
Statistical significance
2)
Transverse Higgs mass (GeV/c
26
Atlas program - Stan Bentvelsen - SAC April 17,
2008
Supersymmetry


We look for new physics
beyond the Standard Model, in
particular SUSY
Inclusively: 1 e or , at least
four hard jets, significant ETmiss
or multi-leptons plus jets

Excellent discovery potential
already for 1 fb-1
 SUSY mass scales up to 1 TeV
can be probed
 Less sensitive to QCD
background than search mode
without leptons
Various MSUGRA
Benchmark points
Dominating backgrounds: ttbar,
W+jets
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Susy: ‘Data driven’ bckgrnd estimation


Crucial issue:
 Understand SM background?
Fit semi-leptonic ttbar, fully leptonic
ttbar, and W+jets components
Solution:
 in distributions of ETmiss, MT, and “Mtop”
 Data-driven estimation of
 Sideband extrapolation to signal

backgrounds in-situ

region
Many independent methods:

 Has been proven to work fine
 Nikhef method: combined fit in
one-lepton search mode
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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High PT top reconstruction

New physics in ttbar-like
final states
○ SM ttbar production is a
background
○ Anomalous top quark
production as signal of new
physics
j1
dR
dR j2
b
t

Split overlapping jets:
 “reverse” kt algorithm
 y12 = scale of jet
subcomponents before last
merge
 resonances, stop
quarks,…

 Effort on improving
high-pT top quark
production
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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First Atlas publication

Atlas detector paper
 Complete description of
~420 pages
Overview
Magnet System
Background radiation
Inner Detector
Calorimetry
Muon Spectrometer
Forward detectors
Trigger & DAQ
Integration & Installation
Expected performance
 Submitted to JINST
35 Countries
164 Institutions
1900 Scientific Authors total
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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SLHC upgrade: factor in 10 lumi

Atlas-Nikhef interests:

 Replacement pixel b-layer
Our ambitions:
 Pixel detector
○ ~ 2012, after 3 yrs of full lumi
○ Involvement pixel b-layer
○ Design Front End
 Complete rebuild of Inner
electronics
○ GOSSIP to replace silicon
sensors close to the IP
Detector
○ Around 2016
○ No more gaseous TRT
 (see R&D program)
 Silicon (short) strip
tracker
○ Design and production
 Cooling
○ Implement C02 cooling
 Lightweight structures
Atlas program - Stan Bentvelsen SAC April 17, 2008
P 31
Conclusions

The ATLAS detector is fully in place
 Routinely taking cosmics with most subsystems

Nikhef hardware responsibilities in good shape
 Culminated in important knowledge on detector
operation and performance

Challenging operation of ATLAS ahead
 In situ calibration, alignment, background studies…
 ‘Final dress rehearsal’ excellent preparation for physics
 Detector shifts starting May 1st.
Atlas program - Stan Bentvelsen - SAC April 17,
2008
32
ATLAS is a lifestyle

T-shirts, baseball caps, pens,
Newspaper, leaflets, YouTube
movies, Atlas DVD’s, the Atlas
book, posters, cards, etcetera
Give us beam, and you will not be disappointed!
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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BACK
UP
Atlas program - Stan Bentvelsen - SAC April 17,
2008
34
No AtlasBedankt!
without Nikhef
excellent
technical & engineer support!
Atlas program - Stan Bentvelsen - SAC April 17, 2008
35
todo
Milestone runs introduceren
 GRID
 Computing/analyse models

Atlas program - Stan Bentvelsen - SAC April 17,
2008
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Final remarks

The workload at CERN was high in the past year
 Notably for technicians of the SCT and MDT
○ Planned to be permanently at CERN for a few months
○ In reality they were there more than year
 Very committed, but demand was stretched to the limit
 Technicians essential – we should show this more explicitly

LHC schedule
 We know about the delays –
○ it has direct impact on the schedule of our PhD students for
example
 But the uncertainty on the schedule is sometimes frustrating
○ Last year we were surprised by the 2007 run of 900 GeV
○ CERN should be more clear about current 2007 schedule
 Is 900 GeV run cancelled or not?
Atlas program - Stan Bentvelsen SAC April 17, 2008
P 37
Atlas program - Stan Bentvelsen - SAC April 17,
2008
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ATLAS
Collaboration
35 Countries
164 Institutions
1900 Scientific Authors total
(1550 with a PhD, for M&O share)
New application for CB decision on Friday:
Göttingen, Germany
New Expressions of Interest:
Santiago (PUC)/ Valparaíso (UTFSM), Chile
Bogotá (UAN), Colombia
Albany, Alberta, NIKHEF Amsterdam, Ankara, LAPP Annecy, Argonne NL, Arizona, UT Arlington, Athens, NTU Athens, Baku,
IFAE Barcelona, Belgrade, Bergen, Berkeley LBL and UC, HU Berlin, Bern, Birmingham, Bologna, Bonn, Boston, Brandeis,
Bratislava/SAS Kosice, Brookhaven NL, Buenos Aires, Bucharest, Cambridge, Carleton, Casablanca/Rabat, CERN, Chinese Cluster,
Chicago, Clermont-Ferrand, Columbia, NBI Copenhagen, Cosenza, AGH UST Cracow, IFJ PAN Cracow, DESY, Dortmund,
TU Dresden, JINR Dubna, Duke, Frascati, Freiburg, Geneva, Genoa, Giessen, Glasgow, LPSC Grenoble, Technion Haifa, Hampton,
Harvard, Heidelberg, Hiroshima, Hiroshima IT, Indiana, Innsbruck, Iowa SU, Irvine UC, Istanbul Bogazici, KEK, Kobe, Kyoto,
Kyoto UE, Lancaster, UN La Plata, Lecce, Lisbon LIP, Liverpool, Ljubljana, QMW London, RHBNC London, UC London, Lund,
UA Madrid, Mainz, Manchester, Mannheim, CPPM Marseille, Massachusetts, MIT, Melbourne, Michigan, Michigan SU, Milano,
Minsk NAS, Minsk NCPHEP, Montreal, McGill Montreal, FIAN Moscow, ITEP Moscow, MEPhI Moscow, MSU Moscow, Munich LMU,
MPI Munich, Nagasaki IAS, Nagoya, Naples, New Mexico, New York, Nijmegen, BINP Novosibirsk, Ohio SU, Okayama, Oklahoma,
Oklahoma SU, Oregon, LAL Orsay, Osaka, Oslo, Oxford, Paris VI and VII, Pavia, Pennsylvania, Pisa, Pittsburgh,
CAS Prague, CU Prague, TU Prague, IHEP Protvino, Regina, Ritsumeikan, UFRJ Rio de Janeiro, Rome I, Rome II, Rome III,
Rutherford Appleton Laboratory, DAPNIA Saclay, Santa Cruz UC, Sheffield, Shinshu, Siegen, Simon Fraser Burnaby, SLAC,
Southern Methodist Dallas, NPI Petersburg, Stockholm, KTH Stockholm, Stony Brook, Sydney, AS Taipei, Tbilisi, Tel Aviv,
Thessaloniki, Tokyo ICEPP, Tokyo MU, Toronto, TRIUMF, Tsukuba, Tufts, Udine, Uppsala, Urbana UI, Valencia, UBC Vancouver,
Atlas program
- Stan Bentvelsen
- SAC
April 17, 2008
39
Victoria, Washington, Weizmann Rehovot,
FH Wiener
Neustadt,
Wisconsin,
Wuppertal, Yale, Yerevan
Muon systeem
Atlas program - Stan Bentvelsen - SAC April 17,
2008
40
Nikhef-Atlas group
 Age profile Atlas group:

16 fte permanent staff
 Geographic location


Amsterdam: FOM & UvA
 13 fte perm staff
Nijmegen: FOM & RU
 3 fte perm staff
Involvement in ATLAS management











Nigel Hessey – Upgrade coordinator
Kors Bos – Computing Operation coordinator
Paul de Jong - Publications committee
Stan Bentvelsen – Convener top physics group
Peter Kluit – Convener muon combined performance
Wouter Verkerke – Physics validation coordinator
Patrick Werneke – Technical coordinator SCT endcaps
Charles Timmermans – Convenor Graphics group
Stan Bentvelsen – Advisory committee CB
Olya Igonkina – Tau trigger convenor
Atlas program - Stan Bentvelsen SAC April 17, 2008
Awards & external funding











VENI “World wide trigger “ Sander Klous
VIDI “Radiating Top Quarks”, Auke Pieter Colijn
VIDI “Fundamental Physics at 100 zeptometers” Ivo van Vulpen
VICI “Top physics; a new era in particle physics” SB
FOM project “Large extra dimensions”, Paul de Jong & SB
FOM project “Higgs or no Higgs at the LHC”, Ronald Kleiss & SB
FOM project “Search for supersymmetry” Nicolo de Groot
FOM project “Higgs asap” Sijbrand de Jong
FOM project “Higgs search at D0”, Sijbrand de Jong
Marie Curie fellowship, Sacha Caron
Rubicon subsistence, Max Baak
P 41
Atlas program - Stan Bentvelsen - SAC April 17,
2008
42
The beam vacuum pipe

Two from three sections are installed
Installation of the ID beam pipe (with the Beryllium Connection of the ID section to the LAr EC
section) together with the Pixel package
beam pipe section
Atlas program - Stan Bentvelsen - SAC April 17,
2008
43
Common Computing Readiness

Common Computing at LHC
 LHC operational: all 4 experiments will take data
 Data rates and volumes to be handles at Tier1 and
Tier2 is the sum of all experiments
 This scale of operating needs to be prepared and
planned

Set-up of Combined Challenge (aka CCRC)
 Should be done in advance of data taking
○ Set of functional tests in February 2008
○ Final challenge in May 2008
Atlas program - Stan Bentvelsen - SAC April 17,
2008
44
Performance/analyse
Permormance of the detector
And blablabla
Nicole
Ruckstuhl
Menelaos
Tsiakiris
Atlas program - Stan Bentvelsen - SAC April 17,
2008
45
Technical support
Atlas program - Stan Bentvelsen - SAC April 17,
2008
46
ATLAS
ATLAS detector as combination of
Active detectors
Connectivity services (cables and pipes)
Support and access structures
Operation infrastructure
Cryogenics, cooling units, gas distribution, power
distribution, ventilation …
Controls and safety systems
Front-end and back-end electronics
Data flow hardware and software
Atlas
program Stan
Bentvelsen SAC April 17,
2008
47
Today’s & 2008 activities

‘Milestone’ running periods
 Full test of the data taking chain,
mimicing ATLAS runs
 Test of online and offline
software and computing
infrastructure

Completion of the detector
installation
 ~6000/7000 tons installed

Hardware commissioning
 Electronic systems, controls,
safety systems
Atlas program - Stan Bentvelsen - SAC April 17, 2008
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Atlas program - Stan Bentvelsen - SAC April 17, 2008
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