Planning for the SLAC ATLAS Program

1. Planning for the SLAC ATLAS Program D. MacFarlane Deputy ALD for PPA Planning for the SLAC ATLAS Program Page 1

2. Background to the planning process • SLAC is a relative newcomer to ATLAS, formally joining the collaboration in July 2006 • Overall effort was about 15 FTEs in FY08, including faculty and staff scientists, professional staff, postdocs, and graduate students • Curtailment of the B Factory program has accelerated the timeline for evaluation areas of engagement on ATLAS, including upgrade R&D • ATLAS is the highest priority accelerator-based particle physics program at SLAC going forward, driven by our assessment of the physics opportunities and the national priority enunciated by P-5 and HEPAP • Discussions with OHEP in May led to the proposal that SLAC prepare a white paper with plans for this expanded ATLAS program • We concluded that it would be best to investigate opportunities in detail, anticipating that the subsequent steps would thereby be better informed Planning for the SLAC ATLAS Program Page 2

3. The ATLAS White Paper • A White Paper has been developed to define in concrete terms the areas we see as a good match to our interests and expertise • Our approach has been to work bottoms up to understand specific needs, future opportunities & our ability to contribute with effectiveness and impact • This process has also allowed us to define the potential interest within laboratory staff, so that we now have a concrete model for the individuals, as well as their skills and interests • Our approach has allowed us to make an independent assessment of opportunities and ATLAS needs • We have used the White Paper as the basis for discussion with US ATLAS management in formulating an overall strategy with an integrated view of SLAC’s role • Discussions with US ATLAS management occurred on October 21, November 6, and November 18 • OHEP briefing occurred on October 8 • US ATLAS management, OHEP program managers, and SLAC will meet again in Germantown on January 7 to settle on a plan for FY09 Planning for the SLAC ATLAS Program Page 3

4. Potential impact on US ATLAS science & capability • If the White Paper plan were implemented, the SLAC ATLAS Program would represent the largest single institutional effort in the US ATLAS community • Further growth would be anticipated as new people joining in FY09 ramp up to full time • A Western Data Analysis Facility, although not yet proposed or incorporated in the plan, could bring even more growth • However, with the exception of construction funding for future upgrade projects, this plan fits within a constant level of effort model for the SLAC PPA program • A large infusion from SLAC offers some real opportunities to further strengthen the US ATLAS community • US ATLAS is geographically dispersed with important eastern & western communities that would be well served by strong local centers • SLAC team has the depth & core capability to sustain major hardware system operations & upgrades, ATLAS computing & analysis support, while aiming to be a vibrant role in the US ATLAS physics community Planning for the SLAC ATLAS Program Page 4

5. Organizing themes for the white paper Theme 1: Existing & future upgrades for the Pixel System Sections I.A, III.A, III.B, III.C, III.D, III.E, & III.G Theme 2: Existing & future upgrades for DAQ and trigger Sections I.B, & III.H Theme 3: Simulations for the existing detector and upgrades Sections I.E, & III.F Theme 4: Tier 2 Center & potential Western Data Analysis Facility Section II Theme 5: SLAC and the Bay Area as a physics center Section I.D, I.F, & IV Planning for the SLAC ATLAS Program Page 5

6. Theme 1: Pixel System and tracking • Current ATLAS effort: Pixel System operation • In partnership with LBNL, we have a significant and growing role on the present Pixel System; engaged in commissioning, calibration, and now extending broadly into understanding and improving the performance of the tracking system as a whole • More work in this area remains, particularly in the next few years, to fully understand and optimize the capabilities of this system • Upgrade effort: Insertable B-Layer (IBL) project • Pixel inner B-layer will reach its radiation lifetime after a few years at 1034, with extended 2012-2013 shutdown as the only window for intervention • ATLAS is moving rapidly towards mounting a project to construct an insertable B layer (IBL) on this timescale, since replacement is not practical • Significant technical challenges need to be overcome for the compressed schedule, suggesting an enhanced US effort will be essential for success • Working with LBNL and UCSC to understand what role is both appropriate and sustainable for the US, e.g., end-of-stave to ROD services design and implementation, with SLAC as a significant partner in formulating a plan Planning for the SLAC ATLAS Program Page 6

7. Enlarged PP1 area 3650 mm Mounting collar at PP0 700 mm First look at IBL installation & services M.Oriunno, N.Karita ATLAS tracker upgrade meeting NIKHEF, Nov 5-7, 2008 PP0 PP1 Planning for the SLAC ATLAS Program Page 7

8. Theme 1: Pixel System and tracking • Upgrade effort: replacement Pixel System • Approval of Stage 1 upgrade to the LHC, with a goal of 3x1034 luminosity in 2013-2017, necessitates upgrade of the existing Pixel System by about 2017 (after ~300 fb-1) • Subject of recent pre-CD-0 JOG review, where significant questions arose about the time frame needed to construct the replacement system • We believe that such an upgrade is inevitable and are working closely with LBNL and UCSC, and ATLAS as a whole, to develop a more detailed plan • Upgrade R&D • Engaging in helping ATLAS reach conclusions about important technical decisions, e.g., CO2 cooling, electrical design for prototype staves, data transmission & 3d pixel sensors • Activities such as CO2 cooling anticipate, along with a new test stand, some of the infrastructure needed to sustain a major pixel test and assembly effort Planning for the SLAC ATLAS Program Page 8

9. Phase 1 blown CO2 system under test M.Oriunno ATLAS tracker upgrade meeting NIKHEF, Nov 5-7, 2008 Planning for the SLAC ATLAS Program Page 9

10. Theme 2: DAQ and HLT • Current ATLAS effort: DAQ and HLT • System for prompt configuration of the HLT farm • Collaborating with CERN IT on CORAL server project for technology-independent database access • Development of a partial event build capability for calibration data • HLT commissioning and trigger algorithm development • Development of online beam spot monitoring and distribution • Support for UCI and commissioning of the CSC ROD system • Upgrade effort: some initial directions for DAQ and HLT • Will likely be more adiabatic effort, so only initial ideas discussed • Develop a HLT performance improvement program based on performance monitoring and analysis capability (found to be very valuable at BABAR), and improved parallelism through data sharing • Explore adapting generic ATCA-based DAQ platform to provide a high-performance integrated solution to DAQ requirements for ATLAS at the sLHC; may also provide an opportunity for a Level 1.5 trigger capability Planning for the SLAC ATLAS Program Page 10

11. To L2 & Event Building (X12) 10 gb/s ATCA crate with ROD & CIM Rear Transition Module Rear Transition Module P3 P3 L1 fanout L1 fanout switch management switch management 10-GE switch 10-GE switch 10-GE switch 10-GE switch CIM CIM Cluster-Interconnect Module 836 RODs 1574 ROLs 537 ROBIns 68 PCs Backplane 235 ROMs 45 CIMs (X2) 10 gb/s ROMs 76 crates 25 crates (X2) 2.5 gb/s Read-Out Module Would greatly simplify current system and scales to meet 1035 requirements Shelf Management from L1 To monitoring & control from L1 Possible upgrade path for ATLAS TDAQ Planning for the SLAC ATLAS Program Page 11 M.Huffer, G.Haller, R.Bartoldus, Su Dong ATLAS TDAQ upgrade proposal

12. Theme 3: Simulations • Current ATLAS effort: GEANT4 core support and performance enhancement • Have emphasized speed optimization of the current simulation, contributions to core muon simulation, optimization of field integration, physics validation, and other improvements to the code • Contributions to the development of the capability for event overlay and zero-bias background event sampling • Engaging at leadership level in next steps in performance improvement • Upgrade effort: Pixel and Tracking Systems layout studies • ATLAS is proceeding quickly to make basic layout design decisions for the future Pixel and Silicon Tracker Systems • We propose to use existing tools, either within the ATLAS simulation tool kit or in conjunction with the linear collider framework LCsim, to provide physics and performance guidance to these design decisions Planning for the SLAC ATLAS Program Page 12

13. Theme 4: Tier 2 and Analysis Facility • Planning for ATLAS computing and analysis well advanced, in a tiered and distributed model quite similar to that used by BABAR • Tier 2 center at SLAC, representing about 20% of the installed BABAR computing hardware, is up and functioning well • When BABAR completes data reprocessing, ATLAS will benefit enormously from large increase of available CPU cycles in the general queues • By end of 2010, the BABAR will complete its intense analysis period, and the computing model will change significantly • At the same time, based on experience with BABAR and at the Tevatron, we see many compute intensive operational or analysis needs that will require major consolidated computing resources • Physics tools and algorithm development based on multiple reprocessing of significant fractions of ESD-level events • Alignment calibration & development based on calibration data streams • Development and validation of high level trigger algorithms Planning for the SLAC ATLAS Program Page 13

14. Theme 4: Tier 2 and Analysis Facility • In general, effective use of ATLAS data will require a system that is responsive to the demands of user-driven analyses and a close relationship between the analysis community and computing facility • Sharing hardware resources between BABAR, ATLAS, and GLAST, while maintaining these systems with common personnel, will be both cost effective & more flexible in responding to demand • Working to develop a proposal for a Western Data Analysis Facility in conjunction with US ATLAS and ATLAS computing management • Needs to account for anticipated migration of BABAR needs, and projected on-site power and cooling constraints • Needs to quantify hardware and personnel requirements to meet the identified or projected demand • Needs to integrate into US ATLAS and ATLAS planning based on initial experience with data • Richard Mount is leading the development of a Analysis Facility proposal with a 75% appointment in PPA Planning for the SLAC ATLAS Program Page 14

15. Theme 5: The bay area as a west-coast ATLAS center • CERN cannot host major portions of the LHC collaborations long term • Infrastructure does not exist to host such a community • Computing resources to support physics analysis are hosted elsewhere • Costs of sustaining a large US community in Geneva will be prohibitive • As a regional center, the Bay Area and SLAC in particular can play a leading role in supporting the exploitation of LHC physics • Concentration of expertise on computing, analysis and detector systems • Proximity of physics analysis support centers, organization of workshops, tutorials and seminars will be attractive • Strength of Theory Groups and their focus of interest in the LHC physics program will be a source of analysis advice and ideas • Attractive training centers for students & postdocs, from a combination of tutorials, available expertise, & participation in upgrade R&D activities • We are committed over the next several years to develop a community and put in place the elements of a vibrant Bay Area center Planning for the SLAC ATLAS Program Page 15

16. Budget planning • A detailed budget model has been developed on the basis of a specific list of ATLAS and ATLAS upgrade participants and the White Paper activities • This model assumes no growth in the SLAC core budget outside 3.5% inflation per year, and no growth in core PPA staff levels outside this constraint • In our 10-year outlook plan, we do show an upgrade construction profile for ATLAS, but the preparation, R&D, and pre-engineering are assumed to be part of our core program • Our focus in the White Paper is FY08 and FY09, pending further discussion with US ATLAS management • Relatively small FTE fractions for many upgrade participants will grow in out years • Budget does not include an analysis of computing support budgets and personnel, pending development of a detailed Analysis Facility model Planning for the SLAC ATLAS Program Page 16

17. Budget Model: ATLAS Model of FTE and budget in FY09 for the current ATLAS experiment alone Planning for the SLAC ATLAS Program Page 17

18. Budget Model: ATLAS Model of FTE and budget in FY09 for the current ATLAS experiment and upgrades Planning for the SLAC ATLAS Program Page 18

19. Budget Model: ATLAS and ATLAS upgrades Growth of FTE and budget from FY08 to FY09 for the overall ATLAS program Planning for the SLAC ATLAS Program Page 19

20. Budget Model: ATLAS and ATLAS upgrades Breakdown of overall FTE plan and evolution of fully burdened budget Planning for the SLAC ATLAS Program Page 20

21. Summary • White Paper provides a detailed model for a significantly expanded SLAC role on ATLAS and the beginnings of an upgrade R&D effort • Model is the result of a bottoms up look at opportunities, matched against strengths, expertise, and interests • Ideas for an expanded computing role have been suggested and we are now in the process of developing a concrete proposal in consultation with US ATLAS and ATLAS management • Model helps us define the set of possible tasks and the staff who would be interested in taking on a role in ATLAS or the ATLAS upgrades • We are presently discussing this model with US ATLAS management and OHEP to produce a coherent strategic plan with an integrated set of roles for the SLAC ATLAS Program • May result in some changes in emphasis in program, and some changes in assumed program funding streams, e.g., ATLAS M&O and Detector R&D • The influx and rapid growth of the SLAC ATLAS program is a significant enhancement to the existing US ATLAS effort and the strength of the US ATLAS R&D effort Planning for the SLAC ATLAS Program Page 21

22. Backup material Planning for the SLAC ATLAS Program Page 22

23. Current working model for ATLAS program Planning for the SLAC ATLAS Program Page 23

24. Possible ATLAS growth profile Assumptions: Growth in FTE fraction for FY09 personnel and no SuperB program, leading to additional staff influx following BABAR intense-analysis phase in 2011 Planning for the SLAC ATLAS Program Page 24