Introduction: Harvard ATLAS Group

John Huth

Outline

• Accelerator status and schedule

• Detector status and schedule

• Organization of Harvard ATLAS Group

An historic moment:Closure of the LHC beam pipe ringon 16th June (the last piece was the one shown here in ATLAS side A)

Magnet cooldown status11 Aug

Successful synchronization test of clockwise beamInjected for approx. 3 km

Aug. 8

Counter-clockwise beams scheduled for 22 Aug

Accelerator Commissioning

• Major milestones in ’08– 10 TeV, L = 1E28 to 1E31 est– Clockwise injection 8 Aug.– Counterclockwise injection 22 Aug.– Circulating beams 10 Sept.– Colliding beams 20 October– Run till mid-Dec– Guess of integrated luminosity 1 pb-1 to tape

Luminosity determination in early running

Ultimate accuracy estimated at 5%Source = W,Z cross sections

Initial determination from beam parametersVan der Meer scansInstantaneous tracking in LUCID detectors (forwardCerenkov detectors)Estimate accuracy 15-20%

ATLAS Detector

Overall Status

• Magnets working, functional to full field

• Minor issues being worked on, solved– Shielding of LAr power supplies– Magnetic field mapping– Inner detector cooling– Trigger readout and timing

• Should be ready with a functional detector for first collisions

Harvard ATLAS History

• Joined 1995– Responsible for MDT (Monitored Drift Tube) electronics design,

production– Chamber construction site for endcap muon system– Development of computing model for LHC (Grids)

• More recently– Muon subsystem installation, commissioning, operations,

reconstruction– Physics simulation– Trigger development – Magnetic field mapping– Local computing cluster– Tier 2 facility (w/ BU)

ATLAS Muon Subsystem

Personnel

• Faculty/Scientists– George Brandenburg (retired, consulting)– Melissa Franklin (transitioning from CDF)– Joao Guimaraes da Costa– John Huth– Masahiro Morii (transitioning from BaBar)

• Postdoctoral scientists– Alberto Belloni– Kevin Black– Corinne Mills– Shulamit Moed

Personnel (con’t)• Graduate students

– Lashkar Kashif (Zpt distribution)– Verena Martinez Outschoorn– Srivas Prasad– Ben Smith– Michael Kagan– Laura Jeanty– Chin Lin Wong– Giovanni Zevi Della Porta

• Technical support– John Oliver (EE)– Sarah Harder (Tech)– Ned Henry (Tech)– Suvendra Dutta (sys-admin)– Steve Sansone (Tech)

ATLAS Positions

• Kevin Black – Convener of inclusive lepton subgroup, Muon Commissioning Software Coordinator

• Alberto Belloni – Muon DAQ Coordinator

• Joao Guimares – Muon Management Group

Planned Activities in 09

• Muon subsystem commissioning and operations• Muon DAQ and online monitoring• Muon reconstruction software• Physics analysis (Z pt distribution, W’, Z’; top;

BSM), participation in “Full Dress Rehearsal” (FDR)

• Tier 2 Center w/ Boston U• Local computing cluster (4096 nodes, 1 PB disk)• High-level trigger core software• Magnetic field studies

Backup Slides

overall commissioning strategy for protons overall commissioning strategy for protons

Hardware commissioning

Machine checkout

Beam commissioning

43 bunch operation

75ns ops

25ns ops IInstall

Phase II and MKB

25ns ops II

Stage A B C

No beam Beam

D

A.A. Pilot physics runPilot physics run First collisionsFirst collisions 43 bunches, no crossing angle, no squeeze, moderate intensities43 bunches, no crossing angle, no squeeze, moderate intensities Displace bunches to optimise collisions in the 4 experimentsDisplace bunches to optimise collisions in the 4 experiments Push performancePush performance Performance limit few 10Performance limit few 103131 cm cm-2-2 s s-1-1 (event pileup) (event pileup)

B.B. 75ns operation75ns operation Establish multi-bunch operation, moderate intensitiesEstablish multi-bunch operation, moderate intensities Relaxed machine parameters (squeeze and crossing angle)Relaxed machine parameters (squeeze and crossing angle) Push squeeze and crossing angle Push squeeze and crossing angle Performance limit 10Performance limit 103333 cm cm-2-2 s s-1-1 (event pileup) (event pileup)

C.C. 25ns operation I25ns operation I Nominal crossing angleNominal crossing angle Push squeezePush squeeze Increase intensity to 50% nominalIncrease intensity to 50% nominal Performance limit 2 10Performance limit 2 103333 cm cm-2-2 s s-1-1

D.D. 25ns operation II25ns operation II Push towards nominal performancePush towards nominal performance

*

bk

N

Optimise

Pileup

Losses

Beampower

Complexity

Minimise

)( *

Courtesy Roger Bailey

strategy for 2008 and 2009strategy for 2008 and 2009

Hardware commissioning

To 5TeV

2008

Machine checkout

Beam commissioning

5TeV

43/156 bunch

operation

Train to 7TeV

B C

No beam Beam

Train to

7TeVMachine checkout

Beam Setup

75ns ops 25ns ops I Shutdown

2009

No beam Beam

A

Courtesy Roger Bailey

stage A: 5TeV collisionsstage A: 5TeV collisions

• Approx 30 days of beam to establish first collisions

• Approx 2 months elapsed– Given optimistic machine

availability– Un-squeezed– Low intensity

• Continue commissioning thereafter– Increased intensity– Squeeze

ParametersParameters Rates in 1 and 5Rates in 1 and 5

kkbb NN * 1,5* 1,5

(m)(m)

LuminosityLuminosity

(cm(cm-2-2ss-1-1))

Events/Events/

crossingcrossing

1 (3)1 (3) 10101010 1111 1.1 101.1 102727 << 1<< 1

44 10101010 1111 4.5 104.5 102727 << 1<< 1

4343 10101010 1111 5.0 105.0 102828 << 1<< 1

4343 4 104 101010 1111 8.0 108.0 102929 << 1<< 1

4343 4 104 101010 33 2.9 102.9 103030 0.360.36

156156 4 104 101010 33 1.0 101.0 103131 0.360.36

156156 99 10 101010 33 5.4 105.4 103131 1.81.8

FfkN

Ln

b*

2

4

fk

LCrossEventrate

b

TOT/

Courtesy Roger Bailey