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PEP-II Minimum Maintenance State and Decommissioning Overview

This overview provides information on the PEP-II e+e- Collider, its components, and the transition to a minimal maintenance state and decommissioning. Includes details on beam line lengths, other components, and D&D planning.

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PEP-II Minimum Maintenance State and Decommissioning Overview

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  1. Overview of PEP-II Minimum Maintenance State and Deactivation and Decommissioning J. Seeman Assistant Director for PPA/LCLS SLAC Annual Program Review

  2. PEP-II e+e- Collider BaBarDetector HER RF 476 MHz LER RF 476 MHz Feedbacks Diagnostics 3.1 GeV positrons x 9 GeV electrons C = 2200 m SLAC Annual Program Review

  3. Beam Line Lengths • HER = 2200 m • LER = 2200 m • HER injection line = 2300 m • LER injection line = 2900 m • Total length of beam line = 9600 m • (6.0 miles) SLAC Annual Program Review

  4. Other components • ~10 miles of cable trays • ~200 miles of cable (typically 1 inch dia) • ~7 miles of water distribution lines • 15 klystron–cavity systems • ~950 electro-magnets per ring (~1900) • ~6 miles of vacuum chambers • Thousands of supports SLAC Annual Program Review

  5. Sprinkler pipes Cable trays Fire sensors Lights Utility pipes Supports Vacuum chambers Magnets SLAC Annual Program Review

  6. B-Factory RF Klystrons C. Pearson SLAC Annual Program Review

  7. PEP-II RF Cavities SLAC Annual Program Review

  8. PEP-II Interaction Region (IR) Halls (six) SLAC Annual Program Review

  9. PEP-II Power Supply Buildings (nine) SLAC Annual Program Review

  10. PEP-II dipoles in 1994 ready for installation (75 magnets shown) SLAC Annual Program Review

  11. Last years plan: Transition & D&D as presented at DOE Review August 2007 • PEP-II was to turn off end of September 2008. • Transition plan white paper (Spring 2007): • Described transition from fully operational state to a minimal-maintenance state in FY09-FY10. • Outlined major tasks and timelines for this transition. • Extrapolated from existing PEP-II operational experience. • Outlined scenarios for the dismantle and disposal phase that emerged from discussions with OS/HEP in early May 2007. • Input to FY09 budget development, FY10-FY11 planning. • D&D for PEP-II to start around FY2015. • But PEP-II actually turned off early April 7, 2008! SLAC Annual Program Review

  12. D&D Review of August 2007 • DOE committee at its review helped us define the issues (August 6-7, 2007). • They made several executive recommendations: • Suggested disassembly of PEP-II and BaBar to be done as quickly as possible, so knowledge is not lost. • Suggested new bottoms up cost estimates to be made. • Suggested that specifying the end state of demolition needs to involve SLAC, DOE, Stanford, and the City of Menlo park. SLAC Annual Program Review

  13. Minimal Maintenance State (MMS) • PEP-II • Cooling systems for magnets, vacuum system drained and dried. • Vacuum system vented and secured. • RF systems, including power supplies, klystrons, cavities, circulators, and dumps drained and secured. • Fire protection, tunnel lighting, water seepage system all maintained. • Some electricity costs for lights, safety, & sumps. SLAC Annual Program Review

  14. PEP-II MMS FY2008 Actual • Due to FY2008 budget realities, PEP-II MMS mostly delayed until FY2009. • PEP-II tunnel is still under PPS (safety) control and tunnel locked. • Both rings are still under vacuum. • Control system is still running. • Power supplies are off and secured. • A few small items removed for LCLS and SPEAR-3. • ILC ECI hardware in IR12 to be shipped to Cornell soon. • RF system secured. • Many requests for reuse of components. SLAC Annual Program Review

  15. SLAC Annual Program Review

  16. PEP-II MMS FY2008 (Reduced recently) Actual FY2008 = ~ 600k$. SLAC Annual Program Review

  17. PEP-II MMS for FY2009 SLAC Annual Program Review

  18. PEP-II MMS for FY2010 SLAC Annual Program Review

  19. PEP-II MMS Power Costs Actual PEP-II power during operation = ~42 MW. Present PEP-II power (July) going towards MMS= ~1.8 MW. SLAC Annual Program Review

  20. D&D depends on future users of PEP-II components Requests: • LCLS: a few small parts: corrector power supplies, gate valves, vacuum gauges, wire scanners, … • SPEAR-3: a few small parts: Loss monitors, streak camera, Bergoz position monitor electronics. • PEP-X: Tunnel, 6 RF stations, support buildings, small magnets, e- injection line • Super-B: All magnets, all power supplies, all electronics modules, 10 RF stations, all supports, all vacuum chambers • Project X: Magnets with vacuum chambers for transport lines • LBNL ALS : Chopper power supplies for ALS bends • J-Lab: Electro-magnets for energy upgrade SLAC Annual Program Review

  21. PEP-X SLAC Annual Program Review

  22. Total length 1800 m 20 m 280 m Super-B Lattice layout, PEP-II magnets reuse Dipoles Available Needed Quads Sexts PEP-II could provide 987 of 1390 magnets for Super-B. Dipole steering correctors would be another 642. SLAC Annual Program Review

  23. D&D Planning • The FY2008 budget only allowed very little activity on D&D. • It is not clear how the PEP-II tunnel and components will be dispersed and recycled at this time. There are several possibilities given the requests and future uses of the facility. • For the next few years the D&D activities will concentrate on the planning process. • MMS will keep the tunnel safe. • Inventory all components. • Assess the long term issues. • Develop procedures • Develop dispersal inventory controls and record keeping. SLAC Annual Program Review

  24. PEP-II D&D Planning SLAC Annual Program Review

  25. Conclusions • PEP-II was turned off April 7, 2008. • PEP-II has transitioned to a low cost state. • About 5 FTEs on PEP-II now (July). • PEP-II power = ~1.8 MW. • Venting, draining magnets will be carried out starting (mainly) in October 2008, leading to the Minimum Maintenance State (MMS) • Other projects are looking into reuse of PEP-II components and infrastructure. • D&D planning will start in earnest in FY2009 SLAC Annual Program Review

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