SLAC at LHC

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SLAC at LHC

• Su Dong

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LHC The Energy Frontier
LHC is no longer a Future facility. The intense
startup preparation is a daily reminder of the
imminent excitement of the 14 TeV PP collisions.
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LARP _at_ SLAC

• SLAC is part of the US LHC Accelerator Research
  Program (LARP) since 2005.
• SLAC is the main site for the project on the
  Phase-II secondary collimators. The team the the
  collimator project

Tom Markiewicz, Lew Keller, Eric Doyle, Steve
Lundgren, Gene Anzalone and Yunhai Cai.
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LHC Phase-II collimators

• System Design Requirement for design luminosity
  of 1034 Protect against quenches as beam is lost
• Design shielding for expected lttgt30hr or 3E9
  p/s or 3.4kW
• Design collimator cooling for t 1 hour or 8E10
  p/s or 90kW
• Plan for occasional bursts of t 12 min or 4E11
  p/s or 450kW
• abort if lasts gt 10 sec

• Primary collimators made of carbon for phase-I.
  Cannot use same style for secondary collimators
  at full luminosity due to high impedance of
  carbon. Need high Z material to improve
  efficiency.
• Adopted the rotating collimator design starting
  from the NLC Consumable spoiler as a prototype.

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Collimator Design Issues
25mm surface tolerance
Gap
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Collimator Project Schedule
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LARP Summary

• SLAC design of rotating phase-II secondary
  collimators is progressing well in prototype
  phase. On track for the goal of a production
  system for LHC at nominal luminosity in 2012.
• New project under discussion RF control
  modeling.
• Alex Chao, Nan Phinney and Uli Wienands are
  organizing participation of LHC commissioning.
• LARP Mini workshop on beam-beam compensation 2007
  will be held at SLAC Jul/2-4/07.

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ATLAS status
ATLAS side A (with the calorimeter end-cap
partially inserted, the LAr end-cap is filled
with LAr)
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Cosmic data taking and other tests in the ATLAS
Control Room
Big Wheel of the Muon system
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SLAC participation in ATLAS

• There is a local community of US west coast
  institutions on ATLAS with traditional close ties
  with SLAC, and university groups on BaBar
  transitioning to ATLAS who would like to see our
  participation and help to provide a base for
  ATLAS activities at SLAC.
• The possible projects on detector and computing
  emerged from the initial investigations in 2005
  found remarkable match to the interests and past
  experience of the SLAC proponents, and with a
  clear path for coherent integration into existing
  US ATLAS effort. This led our investigation to
  only focus on ATLAS.
• In 2005, with only lt2 years to go for LHC turn
  on, there were still many steps to go for getting
  the LHC detectors ready for physics. New efforts
  were more welcome than one naively imagined.
• Strong collaboration with the SLAC theory group.
• Participation in LHC is an integral part of the
  energy frontier effort at SLAC with well
  recognized synergy to the ILC.

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Sequence of Events

• May/05 Initial discussions with US ATLAS senior
  people, with strong support and encouragements.
• Jun-Oct/05 Project discussions with ATLAS
  managers, participating in meetings and visits to
  CERN. Some detailed work started.
• Nov/05-Feb/06 SLAC faculty approval. Endorsement
  from SPC and SLAC EPAC approval.
• Feb/06 SLAC proposal submitted and announced at
  the Feb/06 ATLAS week. Significant presence at
  CERN started.
• May/06 Western Tier-2 center proposal submitted.
• Jul/06 SLAC ATLAS membership to be voted at
  ATLAS week in Stockholm. Proposal of Western
  Tier-2 center located at SLAC was approved by US
  ATLAS.
• Today SLAC also acting as a conduit for small
  new university groups to join ATLAS.

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Experimental Involvement Personnel

• The 4 main areas of SLAC involvement
• Pixel detector.
• High Level Trigger.
• Simulation.
• Tier 2 computing center.
• Also helped on the a rather serious crisis of
• TileCal Low voltage power supplies.

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The Pixel Detector

• Precision vertexing for b-tagging
• 1744 modules of 46K pixels (50x400mm2) each.

Just complete assembly and connectivity tests.
Installation starts late June.
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Pixel Detector Involvement

• Service panel assembly and repairs.
• Connectivity tests and associated online
  software.
• Type-0 cable repairs.
• Endcap system cosmic tests on surface (Dec/06)
  and cosmic data analysis. Cosmic trigger setup by
  SLAC and Columbia group using scintillators from
  SLAC E-143.
• Starting involvement in the DSP programming for
  the pixel ReadOut Drive.Teststand established at
  SLAC.
• Pixel calibration software.
• Pixel monitoring.
• Evolving into alignment, tracking and vertexing.
• Working closely with groups from Columbia Univ,
  Univ Iowa and with LBNL (one of the leading
  institutions).

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Trigger DAQ
500 nodes
1600 nodes
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High Level Trigger Involvement

• Have a very valuable 50 node ATLAS online test
  farm at SLAC inherited from BaBar L3 farm retired
  in 2006.
• HLT configuration scalability for a large number
  of nodes (500 L2 1600 EF with 4-8 processes on
  each). Designed and commissioning the DBproxy
  system.
• HLT release validation and online integration.
• Trigger selection algorithms
• L2 jet and missing Et calorimeter trigger.
• HLT tau trigger
• Starting on L2 b-tag trigger
• Starting on Trigger menu and strategy
• Among collaborators, the groups have been part of
  the SLAC community Oregon, UC Irvine, Wisconsin.
  

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Simulation / Computing

• Speeding up the ATLAS simulation
• Crucial task for the viability of the GEANT
  simulation to serve physics needs. Benefit from
  the core GEANT4 expertise at SLAC.
• Implementing and tuning the GFLASH parameterized
  shower for the LAr calorimeter simulation.
• Looking for other timing speedup options.
• Hosted ATLAS fast shower simulation workshop at
  SLAC in Dec/06 with participants from Europe,
  Australia, Canada US.
• First deployment with factor of 2 improvement is
  being commissioned now.
• Local collaboration student from Columbia Univ.
  resident at SLAC
• Stephen Gowdy is ATLAS Grid tools services
  coordinator.
• Xrootd data file server developed at SLAC and
  proven through usage for BaBar, is deployed for
  SLAC Tier-2 and being adopted by CERN.

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Western Tier 2 Center at SLAC

• The Western Tier-2 is proposed by SLAC with
  support from LBNL, UCSC, UCI, Washington,
  Arizona, Oregon, Wisconsin. Richard Mount is the
  PI and Tier-2 advisory board consists of members
  from the above institutions.
• One of 5 Tier-2 centers in the US. 600K/year
  per site.
• Tier 2 functions Simulation production,
  calibrations, and primary location for physics
  analysis.
• Very effective leverage of existing investments.
• Extensive experience in chaotic data access of
  large samples in BaBar analysis computing.
• Lights out no operator 24x7 operation for last
  10 years.
• Common pool with BaBar can benefit both sides by
  exploiting staggered peak usage.
• ATLAS software already running at SLAC since
  Dec/05 to support various analysis/detector/simula
  tion activities, and in stable GRID simulation
  production since early 2006 using spare cycles at
  SLAC.

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Western Tier 2 Status
First batch of 3x18 TB disks brought online 1
month ago and straight into smooth operations.
Serving files using Xrootd. The 78 node x 4
core CPUs are to be brought online next week
(bldg 50 power/cooling).

• Proposed Tier-2 2500 KspecInt2000 CPU 1400TB
  disks by 2010,
• while SCCS has 4000 kspecInt2000 CPU 500TB
  today.
• Can easily accommodate the Tier-2 operation
  compared to a green site.

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Local Physics Activities

• The SLAC ATLAS forum (Wed. noon B-Hive)
• Open to everyone.Active participation from both
• experimentalists and theorists. Theory and
  experimental
• talk on a wide range of topics.
• Informal physics retreat (Mar/5-8/07)
• Participants from SLAC and western groups.
• tau ID/trigger, jet recon, b-tag
• There will be more editions in the future.
• The First ATLAS physics workshop of the Americas
  (Aug/20-23/2007) at SLAC.

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SLAC Physics Involvement

• Trigger Algorithms
• L2 b-tag, L2 Jet/MET, HLT t trigger
• Physics Signature and Utilities
• Jet energy reconstruction improvements using
  tracks
• Missing Et significance
• Jet/vertex association and pileup studies
• Early Physics Analysis Directions
• measurement of top-gtt X
• top cross section via b MET
• SUSY searches
• Trigger for bbH (H-gtbb)
• Explore common physics utilities between analyses
  to buildup
• expertise in physics signatures b-tag, MET,
  jets, t to
• enable inclusive searches for new physics.

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Breakout session talks

• ATLAS Pixel and Simulation Charlie Young
• ATLAS High-Level Trigger Sarah Demers
• ATLAS Physics Activities Ariel Schwartzman

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ATLAS Summary

• SLACs participation in ATLAS is well underway
  and we are working with university groups in the
  SLAC community and with the theoretical
  community.
• The detector and computing projects we are
  involved in are important to ATLAS and to the US
  ATLAS community, which exploits expertise at
  SLAC.
• We are beginning our physics effort, starting
  with physics signature buildup and aiming for new
  physics searches as luminosity ramps up.
• We are investigating of ATLAS upgrade projects.

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Backup Slides
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From Peter Jenni ATLAS trigger physics week
Jun/07
http//lhc.web.cern.ch/lhc/Installation_Commission
ing.htm