1. J. Seeman Assistant Director for PPA/LCLS
Overview of PEP-II Minimum Maintenance State and Deactivation and Decommissioning
J. Seeman
Assistant Director for PPA/LCLS
July 8, 2008
SLAC Annual Program Review

2. SLAC Annual Program Review
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
July 8, 2008
SLAC Annual Program Review

3. SLAC Annual Program Review
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)
July 8, 2008
SLAC Annual Program Review

4. SLAC Annual Program Review
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
July 8, 2008
SLAC Annual Program Review

5. SLAC Annual Program Review
Sprinkler pipes
Cable trays
Fire sensors
Lights
Utility pipes
Supports
Vacuum chambers
Magnets
July 8, 2008
SLAC Annual Program Review

6. SLAC Annual Program Review
B-Factory RF Klystrons
C. Pearson
July 8, 2008
SLAC Annual Program Review

7. SLAC Annual Program Review
PEP-II RF Cavities
PEP-II LER RF
July 8, 2008
SLAC Annual Program Review

8. PEP-II Interaction Region (IR) Halls (six)
July 8, 2008
SLAC Annual Program Review

9. PEP-II Power Supply Buildings (nine)
July 8, 2008
SLAC Annual Program Review

10. SLAC Annual Program Review
PEP-II dipoles in 1994 ready for installation (75 magnets shown)
July 8, 2008
SLAC Annual Program Review

11. SLAC Annual Program Review
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!
July 8, 2008
SLAC Annual Program Review

12. SLAC Annual Program Review
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.
July 8, 2008
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.
July 8, 2008
SLAC Annual Program Review

14. SLAC Annual Program Review
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.
July 8, 2008
SLAC Annual Program Review

15. SLAC Annual Program Review
July 8, 2008
SLAC Annual Program Review

16. PEP-II MMS FY2008 (Reduced recently)
Actual FY2008 = ~ 600k$.
July 8, 2008
SLAC Annual Program Review

17. SLAC Annual Program Review
PEP-II MMS for FY2009
July 8, 2008
SLAC Annual Program Review

18. SLAC Annual Program Review
PEP-II MMS for FY2010
July 8, 2008
SLAC Annual Program Review

19. SLAC Annual Program Review
PEP-II MMS Power Costs
Actual PEP-II power during operation = ~42 MW.
Present PEP-II power (July) going towards MMS= ~1.8 MW.
July 8, 2008
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
July 8, 2008
SLAC Annual Program Review

21. SLAC Annual Program Review
PEP-X
July 8, 2008
SLAC Annual Program Review

22. Super-B Lattice layout, PEP-II magnets reuse
Lmag (m)
0.45
5.4
PEP HER -
194
PEP LER
SBF HER
130
SBF LER
224 18
SBF Total
148
Needed 30
Total length 1800 m
280 m
20 m
Dipoles
Available
Needed
Quads
Lmag (m)
0.56
0.73
0.43
0.7
0.4
PEP HER
202 82 -
PEP LER
353
SBF HER
165
108 2
SBF LER 88
SBF Total
253
216 4
Needed
51*
134
Lmag (m)
0.25
0.5
PEP HER/LER
188 -
SBF Total
372 4
Needed
184
Sexts
PEP-II could provide 987 of 1390 magnets for Super-B.
Dipole steering correctors would be another 642.
July 8, 2008
SLAC Annual Program Review

23. SLAC Annual Program Review
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.
July 8, 2008
SLAC Annual Program Review

24. SLAC Annual Program Review
PEP-II D&D Planning
July 8, 2008
SLAC Annual Program Review

25. SLAC Annual Program Review
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
July 8, 2008
SLAC Annual Program Review