introduction: harvard atlas group
DESCRIPTION
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 ring on 16 th June (the last piece was the one shown here in ATLAS side A). - PowerPoint PPT PresentationTRANSCRIPT
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Introduction: Harvard ATLAS Group
John Huth
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Outline
• Accelerator status and schedule
• Detector status and schedule
• Organization of Harvard ATLAS Group
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An historic moment:Closure of the LHC beam pipe ringon 16th June (the last piece was the one shown here in ATLAS side A)
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Magnet cooldown status11 Aug
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Successful synchronization test of clockwise beamInjected for approx. 3 km
Aug. 8
Counter-clockwise beams scheduled for 22 Aug
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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
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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%
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ATLAS Detector
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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
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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)
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ATLAS Muon Subsystem
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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
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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)
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ATLAS Positions
• Kevin Black – Convener of inclusive lepton subgroup, Muon Commissioning Software Coordinator
• Alberto Belloni – Muon DAQ Coordinator
• Joao Guimares – Muon Management Group
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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
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Backup Slides
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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
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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
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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