Jun/12/07 Su DongDOE SLAC HEP Program Review: SLAC at LHC1 SLAC at LHC Su Dong.

Jun/12/07 Su Dong DOE SLAC HEP Program Review: SLAC at LHC 1

SLAC at LHC

Su Dong


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.


LARP @ 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:

beam

beam

Tom Markiewicz, Lew Keller, Eric Doyle, Steve Lundgren, Gene Anzalone and Yunhai Cai.


LHC Phase-II collimators

• System Design Requirement for design luminosity of 1034: Protect against quenches as beam is lost– Design shielding for expected <>~30hr or 3E9 p/s or 3.4kW– Design collimator cooling for = 1 hour or 8E10 p/s or 90kW– Plan for occasional bursts of = 12 min or 4E11 p/s or 450kW

• abort if lasts > 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.


Collimator Design Issues

Gap

25m surface tolerance


Collimator Project ScheduleSep/2007

1st full length jaw ready for thermal tests

Jul/2008 2 full length jaws with full motion control in vacuum tank available for mechanical & vacuum tests in all orientations (“RC1”)

Jan/2009 Final prototype (“RC2”) fully operational with final materials, LHC control system-compatible, prototype shipped to CERN to beam test

2010 Installation of prototypes into the LHC and tests with LHC beam at 7 TeV.Decision on phase 2 design and production at end of year

2011 Production of 36 phase 2 collimators.

2012 Installation of 30 phase 2 collimators during the 2010/11 shutdown.Commissioning of the phase 2 collimation system. LHC ready for nominal lumi.


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.


ATLAS side A (with the calorimeter end-cap partially inserted, the LAr end-cap is filled with LAr)

ATLAS status


Big Wheel of the Muon system

Cosmic data taking and other testsin the ATLAS Control Room


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 <2 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.


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.


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.

Physicist (FTE)

FY 2006 FY 2007 FY 2008

Faculty+Staff

3.3 5.1 6.5 ?

Fellow+Postdoc

0.5 3.5 5.5 ?

Student 0 2 4 ?


The Pixel Detector

• Precision vertexing for b-tagging• 1744 modules of 46K pixels (50x400m2) each.

Just complete assembly and connectivity tests. Installation starts late June.


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).


Trigger & DAQ

500nodes

1600nodes


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.


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.


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/simulation activities, and in stable GRID simulation production since early 2006 using spare cycles at SLAC.


Western Tier 2 Status

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.

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).


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.


SLAC Physics Involvement

• Trigger AlgorithmsL2 b-tag, L2 Jet/MET, HLT 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->X – top cross section via b + MET– SUSY searches– Trigger for bbH (H->bb)

Explore common physics utilities between analyses to buildup

expertise in physics signatures: b-tag, MET, jets, … to enable inclusive searches for new physics.


Breakout session talks

• ATLAS Pixel and Simulation Charlie Young

• ATLAS High-Level Trigger Sarah Demers

• ATLAS Physics Activities Ariel

Schwartzman


ATLAS Summary • SLAC’s 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.


Backup Slides


Beam pipe close ?

Beam injection ?

Sector cooling

Powering tests

Verbal communication

LHC Installation and Commissioning Committee Summary of meeting 2007-04 held on 27th April 2007 - DRAFT

http://lhc.web.cern.ch/lhc/Installation_Commissioning.htm

From Peter Jenni ATLAS trigger & physics week Jun/07

Jun/12/07 Su DongDOE SLAC HEP Program Review: SLAC at LHC1 SLAC at LHC Su Dong.

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Transcript of Jun/12/07 Su DongDOE SLAC HEP Program Review: SLAC at LHC1 SLAC at LHC Su Dong.