Stan Bentvelsen SAC 2008 1Atlas program - Stan Bentvelsen - SAC April 17, 2008.

Stan Bentvelsen SAC 2008

STATUS OF ATLAS1Atlas program - Stan Bentvelsen - SAC April 17, 2008

Atlas program -

Stan Bentvelsen -

SAC April 17, 2008

ATLAS

Semi Conducting TrackerInstallation Endcap

Muon precision chamber96 MDT BOL chambers

Trigger/DAQMuon Read Out Drivers

Physics performance

End-cap toroidsIn-kind contribution

2

Combined TrackingSoftware contribution

Computing readiness

Nikhef highlights of the last year

SCT Endcap installed

○ after delays due to cooling problems in the barrel

All modules tested & functional Muons

All BOL chambers installed Detector Control System ~ready Alignment system operational

Data acquisition Muon Read Out Drivers in place

Endcap Toroids Installation in Atlas

Computing Developed analysis model Monte Carlo validation

Performance Muon tracking optimization Combined tracking

Physics Physics readiness note

activities○ Commissioning top-quark○ One lepton Susy○ Higgs vector boson fusion

Atlas program - Stan Bentvelsen - SAC April 17, 2008 3

Atlas program - Stan Bentvelsen - SAC April 17, 2008

P 4

Nikhef-Atlas group

Involvement in ATLAS management Nigel Hessey – Upgrade coordinator Kors Bos – Computing Operation coordinator Peter Kluit – Convener muon combined performance Wouter Verkerke – Physics validation coordinator Patrick Werneke – Technical coordinator SCT endcaps Stan Bentvelsen – Advisory committee CB Olya Igonkina – Tau trigger convener

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 since last SAC 6 PhD students FOM m/v O. Igonkina 4 PostDocs (Atlas, VIDI, VICI)

Atlas program - Stan Bentvelsen - SAC April 17, 2008 P 5

Transport of the End-Cap Toroid

InstallationLowering the End-Cap ToroidJune 4th & July 11th 2007

6Atlas program - Stan Bentvelsen - SAC April 17,

2008

• 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 by NIKHEF!

Semi Conductor Tracker


SCT Barrel

SCT End-Caps5.6 meter

2 meter

Installation in Atlas


SCT+TRT endcap installation

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 !

9Atlas program - Stan Bentvelsen - SAC April 17, 2008

2007: Installation SCT 10


2007: Installation of Nikhef’s MDT BOL chambers completed!


Status MDT chambers

All barrel MDT chambers in place Nikhef BOL chambers

operate smoothly Problems in power supplies

○ 50% have HV○ 75% have LV

Quality monitoring ok

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


sector 13A

sector 5A

sector 5C

Muon Direction Distribution


2008

Detector Control System (DCS)

Nikhef heavily involved in DCS system:MDT-DCS module

○ Temperature○ B-field○ Front-End electronics

Alignment○ Barrel


DCS status of muon barrel

Nikhef responsabilities in B- and T- systemsAll T-sensors installed – 98% operationalB-field sensors tested and intercalibrated at upcoming

magnet test


Alignment system & Nikhef

Projective alignmentClose to finished

Acquisition speed upRate of imaging analyses

increased by factor 100Full readout in 15 mins370 images analysed/min


Type Total OK Broken TBD

Projective 117 85 12 20

Axial 1035 998 10 27

Praxial 2006 1938 6 56

Reference 256 232 4 20

CCC 260 234 10 16

BIR/BIM 32 32 0 0

Inplane 2110 2064 8 38

Total 5816 5589 50 177

Goal: 20 mm mechanical precision

Data Acquisition

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

testing, repairing in 15 VME crates

Installation, commissioning Stable running. Few subtle

problems found & solved

ROBIN’s activities firmware upgrades The ATLAS ROBIN R Cranfield et al 2008

JINST 3 T01002

Olya Igonkina


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


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 Calorimeter tag: requiring a m.i.p. in the Hadron Calorimeter Muon Segment tagging reconstruction Refit of inner detector and MS track

Efficiency Z→μμ with cavern backgrndη

19

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 Calibration Data Challenge (2007)

Calibrate, align detector with ‘data procedure’ on MC sample

Tests full chain: procedures, database infrastructure etc…

Menelaos Tsiakiris


2008

Computing & Grid

Validation of Simulation, Reconstruction softwareScope: 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]



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’ end-

user analysis. Build on experience of FDR-1 exercise

22

tt

Cross-section ~ 800 pb

(440 pb with a high-PT lepton)signal = 100 x Tevatron, bckg = 10 x Tevatron

Golden channel (l=e,μ)250,000 events/fb-1

Early data challenges: - Commission ATLAS detector in multi-jet final states - Cross-section measurement

Larger data sample: - Top quark properties (mass, charge, …) - Search for new physics (FCNC, SUSY, Mtt-resonances)

Top quark pair production at the LHC

Nikhef interest in top physics:

Top physics at commissioning


2008

2007/2008: ATLAS physics readiness rapports Include: Top cross-section, Top trigger, Top properties.

ATLAS100 pb-1

Mass 3-jet top candidate [ GeV] Mass 3-jet top candidate [ GeV]

SuperSymmetry

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

~ 500 events

Top physics: determination σ(tt)

100 pb-1


VBF: Higgs W+W- ll ATLAS TDR

VBF H WW

VBF HWW: 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 reconstruction25


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 Two forward, high-Pt jets

Spin zero Higgs: charged leptons prefer to point in

same direction.

Transverse Higgs mass (GeV/c2)

mH(true) = 170 GeV/c2

• background• signal + bkg

Work focus: Optimization of signal

sensitivity w/ neuro-evolution Setup and validation of 5-

dimensional fit to extract Higgs candidates, based fully on bkg control samples.

ATLAS CSC BOOK

Statistical significance 26


Dominating backgrounds: ttbar, W+jets

Supersymmetry

We look for new physics beyond the Standard Model, in particular SUSY

Inclusively: 1 e or , at least four hard jets, significant ET

miss 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 MSUGRABenchmark points


Susy: ‘Data driven’ bckgrnd estimation

Crucial issue: Understand SM background?

Solution: Data-driven estimation of

backgrounds in-situ Many independent methods:

Nikhef method: combined fit in one-lepton search mode

Fit semi-leptonic ttbar, fully leptonic ttbar, and W+jets components in distributions of ET

miss, MT, and “Mtop” Sideband extrapolation to signal

region Has been proven to work fine


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 resonances, stop

quarks,…

Effort on improving high-pT top quark production

Split overlapping jets:“reverse” kt algorithm

y12 = scale of jet subcomponents before last merge


j1

j2b

t

dRdR

First Atlas publication

Atlas detector paperComplete description of

~420 pagesOverview

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 30Atlas program - Stan Bentvelsen - SAC April 17, 2008


SLHC upgrade: factor in 10 lumi

Atlas-Nikhef interests:Replacement pixel b-layer

○ ~ 2012, after 3 yrs of full lumi

Complete rebuild of Inner Detector○ Around 2016○ No more gaseous TRT

Our ambitions:Pixel detector

○ Involvement pixel b-layer

○ Design Front End electronics

○ GOSSIP to replace silicon sensors close to the IP(see R&D program)

Silicon (short) strip tracker○ Design and production

Cooling○ Implement C02 cooling

Lightweight structures

Conclusions

The ATLAS detector is fully in placeRoutinely taking cosmics with most subsystems

Nikhef hardware responsibilities in good shapeCulminated 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 physicsDetector shifts starting May 1st.


2008

ATLAS is a lifestyle

T-shirts, baseball caps, pens, Newspaper, leaflets, YouTube movies, Atlas DVD’s, the Atlas book, posters, cards, etcetera

33Atlas program - Stan Bentvelsen - SAC April 17, 2008Give us beam, and you will not be disappointed!

BACKUP 34


Bedankt!No Atlas without Nikhef excellent

technical & engineer support! 35Atlas program - Stan Bentvelsen - SAC April 17, 2008

todo

Milestone runs introduceren GRID Computing/analyse models


2008


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 limitTechnicians essential – we should show this more explicitly

LHC scheduleWe 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?


2008


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,

Victoria, Washington, Weizmann Rehovot, FH Wiener Neustadt, Wisconsin, Wuppertal, Yale, Yerevan

Muon systeem


2008


Nikhef-Atlas group

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

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

Age profile Atlas group: 16 fte permanent staff

Geographic location Amsterdam: FOM & UvA

13 fte perm staff Nijmegen: FOM & RU

3 fte perm staff


2008

The beam vacuum pipe

Two from three sections are installed


Installation of the ID beam pipe (with the Beryllium section) together with the Pixel package

Connection of the ID section to the LAr EC beam pipe section

43

Common Computing Readiness

Common Computing at LHCLHC operational: all 4 experiments will take dataData rates and volumes to be handles at Tier1 and

Tier2 is the sum of all experimentsThis 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


2008

Performance/analyse

Menelaos Tsiakiris

Nicole Ruckstuhl

Permormance of the detectorAnd blablabla


2008

Technical support


2008

Atlas program -

Stan Bentvelsen -

SAC April 17, 2008

ATLASATLAS detector as combination of

Active detectors

Connectivity services (cables and pipes)

Support and access structures

Operation infrastructure

Cryogenics, cooling units, gas distribution, powerdistribution, ventilation …

Controls and safety systems

Front-end and back-end electronics

Data flow hardware and software

47

Today’s & 2008 activities

Completion of the detector installation ~6000/7000 tons installed

Hardware commissioning Electronic systems, controls, safety

systems

‘Milestone’ running periods Full test of the data taking

chain, mimicing ATLAS runs Test of online and offline

software and computing infrastructure



Stan Bentvelsen SAC 2008 1Atlas program - Stan Bentvelsen - SAC April 17, 2008.

Documents

atlas computing

atlas semi

postdocs atlas

stan bentvelsen sac

nikhefatlas group involvement

endcap toroid slide

fte perm staff nijmegen

fom ru