# Presentation: 396163

## ATLAS

- DoE Review
- May 2003

## ATLAS LBNL Group

- M. Barnett, _V. Chang,_ A. Ciocio, A. Clark, **D. Costanzo**, *S. Dardin*,
_*Deisher, *_**M. Dobbs**,  K. Einsweiler, R. Ely, M. Garcia-Sciveres,
- M. Gilchriese, F. Goozen, C. Haber, _A. Haim, _I. Hinchliffe, _K. Huang_,
- _S. Lee,_ S. Loken, J. Lys, R. Madaras, *F. McCormack,*_ __*J. Muelmenstaedt*__*, *_
- J. Richardson, **Saavedra**, M. Shapiro, H. Spieler, G. Stavropoulos, G. Trilling,
_*J. Virzi, *_*T. Weber, R. Witharm *
- Physics Division and UC Berkeley
- E. Anderssen, L. Blanquart, _A. Das,_ *T. Doolin*, N. Hartman, *J. Hellmers*,
-  *T. Johnson*, J. Joseph, E. Mandelli, G. Meddeler, *R. Powers,*
- A. Smith, *C. Tran,* *J. Wirth*, *G. Zizka*
- Engineering Division
- P. Calafiura, W. Lavrijsen, C. Leggett, M. Marino, D. Quarrie, C. Tull
- NERSC
- Physicist     **Postdoc**       _*Grad Student*_      _Undergraduate_    Engineer	*Technician*

## ATLAS Overview

- ATLAS is fully into production and many final components have been delivered to CERN. Substantial progress in last year.
- Installation underground will begin later this year and continue into global commissioning at the end of 2006.
- Although many schedules are tight, it is feasible for ATLAS to be ready for first LHC beam as planned in 2007.

## ATLAS Detector

- Inner Tracking Detector

## ATLAS Inner Detector

- LBNL Technical Roles in Pixels and SCT

## ATLAS Tracking

## Silicon Strip Detector(SCT)

- About 6x106 channels, 60m2
- Radiation hardness up to 10 MRad(roughly a decade at 1034 luminosity).
- About 4000 modules to be built world-wide, production is underway.
- Integration with mechanical structures, cables etc to begin later this year.

- Silicon detector

- Hybrid

- Integrated circuits

**SCT Barrel Module**

- Strip pitch 80(barrel), 12cm long, noise about 1500e-

## Pixel Detector

- LHC radiation levels at 1034cm-2sec-1 prevent long-term operation of silicon strip detectors for R< 25 cm.
- Pixel detectors have much smaller cell size, lower capacitance and thus noise, that results in signal-to-noise(unirradiated) about 10 times better than silicon strip detectors..
- Critical for tracking and finding secondary vertices(b-tagging)
- _New technology_ for hadron colliders.

- Pixel size 50x400
- About 108 channels
- About 1,000 modules
- Noise about 150e-

## Current LBNL Roles in ATLAS

- Silicon strip detector
- Test system for integrated circuits(ICs) completed and nearly all ICs tested.
- Module production for barrel region underway, have started about 15%
- Strong collaboration with UC Santa Cruz in ICs and module production
- Producing all readout boards for SCT(and pixels) in collaboration with Wisconsin.
- Pixel detector
- Leadership roles in electronics, modules and mechanics
- Production underway of mechanical supports, silicon detectors, ICs and hybrids
- Module prototypes under test, module production to begin in a few months.
- Collaborate with Albany, Iowa State, New Mexico, Ohio State, Oklahoma
- Software, computing and physics simulation
- Lead role in the development of the Athena framework code(the “operating system” for ATLAS software)
- Lead role in development and maintenance of physics simulation tools
- Overall ATLAS software coordinator is D. Quarrie, resident at CERN

## SCT at LBNL

- LBNL originated, designed and built custom, high-speed test systems for the SCT integrated circuits (ABCDs). This has made it possible to keep up with delivery of wafers(more than 1000 wafers have been or will be fabricated)
- Test systems are at UCSC(2 stations), RAL(1 station) and CERN(1 station). Nearly all of the total ICs needed have been tested.
- We will produce about 500 modules and 8% are complete.
- The SCT(and pixel) systems are read out using VME boards located about 100m from the experiment.
- The design work is done by LBNL engineering funded through the University of Wisconsin.
- The final production of the SCT boards will begin in a few months, to be followed afterwards by the pixel boards.

## SCT Module Production in Cleanrooms

- A second precision measuring machine and 2nd wire bonder recently added with Division funding to improve production rate.

- Module Metrology

- Electrical Testing

- Wire Bonding

## Hybrid and Module Production

## Pixel and Beam Pipe Assembly

- About 7m long package
- assembled on surface and lowered
- into collision hall for insertion
- into detector in early 2006

## Pixels Installed

- LBNL responsible for support tube, beam pipe support,
- global support frame and disk region structures.

- Services and
- Beam Pipe Support Structure

- SCT Barrel

- TRT  Forward

- Side C

- Side A

- Services and
- Beam Pipe Support Structure

- Pixel Detector

- TRT  Forward

- Beam Pipe Support Wire

- ID Endplug

- PP1

- PST Support Flexures

- Insertion Trolley

- Beam Pipe

- Pixel Support Tube

- Package Insertion Riders

- Z=848 – Wire Support

- Z=3092 – PP1

- Z=3120 – Adjustors

- PP1 Bellows/Temporary Support

- Z=~3200 – Bellows/Temp. Support

## Composite Structures

- We have developed the capability to make custom composite structures.
- Combined thermal, structural and electrical properties to meet the pixel needs.

- Autoclave at LBNL

- Prototype Support Tube Section and Rails

## Support/Cooling Structures

- Fabrication of pixel support structures is well advanced.

- Global Support Frame

- Disk Support Rings

- Disk Module Support/Cooling

## Pixel Hybrids and Modules

- M. Garcia-Sciveres from LBNL  is the overall ATLAS module coordinator,

- To electrical-to-
- optical transition

- About 1/3 of sensors(detectors)
- have been produced.
- Flex hybrid production underway

## Pixel Electronics

- K. Einsweiler from LBNL is the overall ATLAS pixel electronics coordinator.
- The strong LBNL IC group allows us to lead the pixel electronics effort.
- In addition, we are responsible for providing most of the IC and module tests systems for the collaboration, and these have also been designed and implemented by LBNL.
- First full integrated circuit prototypes were delivered about a year ago and exhaustively tested.
- Chips worked well. Lab and beam tests complete.

## Pixel Integrated Circuits

- The lab and test beam studies in the last year were led by LBNL, and we achieved the _first_ demonstration that pixel technology will work at the LHC.
- Fabrication of dozens of prototype modules complete, more in progress
- Production versions of all chips have been submitted to IBM, first delivery just received.

## Test Beam Efficiencies

- Unirradiated module
- Noise occupancy is
- < 6x10-9 per pixel

- Single-chip assemblies
- irradiated to about 65MRad
- dose with different
- sensors and bump bonds.
- Different chip configurations.

- A

- B

- A and B are different configurations

## Charge Collection After Irradiation

## Pixel System Tests

- System tests underway at LBNL.
- Will grow to long-term test of section of detector soon.

- Pixel Modules on
- Support/Cooling Structure

- Before

- After

## ATLAS Computing Organization 

- LBNL

## Data Challenges and Milestones

- Data challenges completed or underway
- DC0 – a “continuity” test of system. Completed
- DC1(Phase I) – simulated events to study high-level triggers(for preparation of Technical Design Report) and to advance system. Completed.
- Events simulated ~10**7** ,18 countries, 39 institutions involved, completed in August 2002
- LBNL provided about 30% of US computing power.
- DC1(Phase II) – underway. 70 Tb goal. More countries, more Grid
- Future data challenges and milestones
- DC2: mid-2004, like DC1 in scale
- Computing Technical Design Report by mid-2005
- DC3: end 2005. 5 x DC2
- Physics Readiness Report by mid-2006

## LBNL Software Expertise

- Software Project Leader (David Quarrie)
- Leads all software development activities and is the Chief Architect. Resident at CERN.
- Physics Generators Coordinator (Ian Hinchliffe)
- Provides support for all particle generators (Isajet, Pythia, etc.) and integrates them into the overall control framework. U.S. ATLAS Physics Coordinator.
- Framework Coordinator (Paolo Calafiura)
- In charge of the Athena framework and the collaboration with the LHCb developers
- Responsible for coordinating software development for the core services associated with the framework
- ATLAS software training coordinator (Massimo Marino)
- Arranges tutorials and other training courses and is also responsible for detailed design of parts of an LCG common project which will be shared by ATLAS, CMS & LHCb. Resident at CERN.
- Scripting support (Wim Lavrijsen)
- Responsible for making Athena an interactive framework based and for GUI & command line shell designed as a beginners aid
- Calibration/Alignment Infastructure (Charles Leggett)
- Responsible for providing a transparent mechanism whereby time varying data may be automatically tracked by an application code (I.e. the correct geometry for each event is automatically present with no explicit manipulations of the databases by the application code. Also responsible for ROOT histogram & n-tupe support and Geant4 integration into Athena
- GRID Integration (Craig Tull)
- Responsible for the integration of GRID services into Athena (e.g. monitoring, file access, etc.)
- Responsible for definition of Data Dictionary that allows for run-time interrogation of arbitrary objects

## Computing Summary

- Collectively LBNL provides a nucleus of experienced Object Oriented designers around which much of the ATLAS software development is based.
- They provide consultancy services to a large, relatively untrained, developer community
- They coordinate many critical development activities
- They leverage NERSC strengths and provide a core competency within LBNL that can be (and is) applied to other programs (BaBar, SNAP, IceCube, SN-Factory)
- Close collaboration with physics simulation(and later analysis).
- This experience and expertise will be needed well beyond LHC turn-on in 2007, as the avalanche of LHC data arrives.

## On to First Beam

- Complete the fabrication of SCT modules and deliver them to the UK by end 2004.
- Complete fabrication and testing of pixel components and deliver them to CERN by early 2005.
- Then assemble, install and commission pixel detector, which will require continuous presence at CERN with support from the US ATLAS Research Program.
- Make ATLAS software work for data challenges and then ready for first data.
- _Increase LBNL participation in physics analysis_, as part of data challenge activity, and be ready for first data.
- _New physics possible with very little integrated luminosity!_

## Beyond The Initial Detector

- ATLAS has been staged to meet funding realities.
- Pixel system(one layer) staged, current plan is to insert in long shutdown after 1st “physics run”. Would likely use current technology.
- Innermost layer of pixels will die after few years at 1034. Must be replaced, critical for b-tagging. Replacement would use new technology (improved ICs, better detectors, lower mass structures, etc) for improved pixel performance.
- Continued software development will be essential as the luminosity increases towards the design value and to respond to the actual data environment.

## Major Upgrades

- A luminosity upgrade to 1035(SLHC) will require the complete replacement of the tracking detectors.
- Tracking is hard at 1034 and has required extensive R&D for over 15 years.
- Tracking will be harder at 1035 and will require a similar R&D effort => should have started already!
- LBNL plans to remain leader in silicon(pixel) detectors for SLHC

## ATLAS Personnel

- Budget exigencies in the past year or so have prevented us from hiring postdoctoral staff or other new physicists.
- We have added three retirees and redirected senior staff in an attempt to meet our construction commitments. Still short of physicists to meet current commitments.
- We are now nearly at the time when we MUST also ramp up our effort in physics simulation/analysis AND begin upgrades.
- We cannot continue to meet our commitments to the construction projects, software and computing and have a role in physics analysis and the challenging upgrades without additional physicist staff.

## Physicists Today

## Goal By LHC Turn On

- Requires new Divisional. Fellow + new Faculty
- and expected migration of existing physicists
- from CDF and D0.

- Steady ramp up
- of postdocs

## Implications for 2004

- Two postdoc slots have been created by slashing CDF and D0.
- But we will also lose two postdocs during 2004.
- Need minimum of one more postdoc search launched in 2004 and then must ramp up steadily.
- Existing senior personnel are (over)saturated with existing commitments.
- Additional leadership needed – Divisional Fellow.Want to launch search by this Fall.

## Concluding Remarks

- ATLAS is on its way to be ready for first LHC beam.
- LBNL is a world-wide leader in silicon detector technology and leads the development of the ATLAS pixel detector.
- We are providing critical leadership in software and physics simulation, the keys to successful data analysis.
- We look forward to first physics with ATLAS!
- Physicists staff must grow soon to meet our ongoing commitments and to participate in physics analysis at the energy frontier after decades of work.