HEPiX/HEPNT Welcome

1
HEPiX/HEPNT Welcome

• Ian Bird
• JLAB
• 1 November 2000

2
Introduction to JLAB

• Jefferson Lab
• Facilities Science
• Accelerator and HENP experiments
• FEL
• Current status
• Future plans
• Computing
• Overview of computing at JLAB
• Some directions

3
Jefferson Lab Science Programs

• High Energy Nuclear Physics
• CEBAF Accelerator
• 4 (6) GeV continuous wave electron accelerator
• Superconducting RF technology
• Very high beam current
• High beam polarizations possible
• Last Fall Cebaf delivered more polarized
  electrons to expts. than all other electron
  machines in their lifetimes combined
• Free Electron Laser (FEL) facility
• Spin-off of SRF technology, growing user
  community
• Spallation Neutron Source (SNS) (Oak Ridge)
• JLAB is building the superconducting linacs
• Future
• JLAB Energy upgrade
• Construct parts of Rare Isotope Accelerator (RIA)

4
The Laboratory

• 70 M/year operating budget
• 600 staff
• 2000 users _at_ 240 institutions in 36 countries
• SNS means 10 increase in staff over 18 months
• FEL User community technology transfer
• Consortium of University groups and industry
• 100 FEL related users on site
• ARC building ARC II for FEL medical apps

5
Accelerator and experiments
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Experimental Halls
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Nuclear Physics

• 3 experimental halls (A, B, C)
• A, C are single/two arm spectrometers -
  facilities
• Accept very high beam currents
• Data rates from KB/s 10 MB/s depending on
  experiment
• Experiments last from few days to a few months
• B (Cebaf Large Acceptance Spectrometer CLAS)
• Accepts only lower currents
• Large data rates up to 20 MB/s (0.5 TB/day)
• CLAS is size of HEP fixed target experiment 10
  years ago, collaboration 150 people.
• Very much a nuclear physics community

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Computing for NP

• Data storage
• STK silo with 8 RedWoods, 10 9840 drives
• Will add lt10 9940 this year
• 12 TB of stage, cache, analysis disk pools
• Add 10 TB this year (Linux, SCSI/IDE??)
• Processing
• Farm of 250 Linux cpu (8 Solaris..)
• Gigabit network infrastructure

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Scientific computing
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Program upgrades

• Timescale 2005
• Upgrade CEBAF to 12 GeV
• Upgrade existing experiments
• New Hall D tagged photon beam facility
• Data rates 75-100 MB/s to tape (after L3 trigger)
• PWA requires significant simulation effort
• Expect 3 PB/year (raw, processed, simulated)
• I.e Data 2/3 CMS but collaboration of 200
  (not 2000)

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Theory Computing - LQCD

• Very strong Lattice QCD group
• Collaboration is 1/3 of US LQCD effort
• FNAL Brookhaven JLAB/MIT
• Present development system
• 40 Alphas (Linux) with Myrinet
• Proposed this year
• 256 node Alpha cluster (300 Gflops)
• Goal is to build a few TeraFlop system in FY0x

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Free Electron Laser

• Most powerful (1.7kW) IR laser (by a factor 100)
• Upgrades planned to 10 kW IR extend to UV
• Will be 1000 x more powerful than any other
  tuneable IR laser
• Uses SRF technology

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FEL
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FEL

• Growing user community, experiments just
  beginning
• Material science, surface chemistry
• Other applications
• Add HELIOS synchrotron (from IBM)
• time-lapse view of photon-material interactions
• FEL computing
• Expect a serious computing requirement as the
  program grows simulations
• Several Teraflops, could require more than LQCD

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Computing growth

• Accelerator upgrades
• Hall D upgrades to existing Halls
• Large data management analysis requirement
• Lattice QCD
• FEL simulations
• Corresponding growth in user community
• New computing facilities buildings
• Could be 80-100 computing staff ( accelerator)

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Computing groups

• There are 4 computing groups
• Computer Center (35 people)
• Accelerator Controls (25 people)
• Data Acquisition Software (6 people)
• High Performance Computing (4 people)

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Computing groups

• Accelerator controls
• Mainly focused on controls software (EPICS)
• Some system administration, but try to leverage
  off CC
• Data Acquisition
• CODA software for experiments
• High Performance Computing
• LQCD cluster software (PBS, MPI etc)
• Accelerator controls (CDEV)
• Collaborate on PPDG with CC

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Computing groups

• Computer Center
• Scientific computing and LQCD facilities
• Networks and infrastructure
• Desktop computing
• User support (central point for Acc. too)
• MIS (Business services HR)
• Security and reporting to DOE
• Responsible for ADP strategy and reporting
• Members of PPDG

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Summary

• JLAB is fairly small, but
• Has an active and diverse science program
• Several ongoing or upcoming projects promise to
  drive continued expansion
• Several computing initiatives
• Computing facilities and scope will expand in the
  next 5 years