2004 LST Installation Readiness Review

1. 2004 LST Installation Readiness Review 2004 IR-2 Installation Schedule H.J. Krebs May 5, 2004 H.J. Krebs

2. 2004 Installation • Scope of work is located on top & bottom sextants • Remove 18 layers of RPCs • Install 6 layers of 7/8” thick brass absorber in layers 5,7,9,11,13 & 15 – 11.5 tons/sextant • Install LST detectors in layers 1,2,3,4,6,8,10,12,14,16,17 & 18 • An investigation will be performed at commencement of this down to determine if the layer 19 RPC can be retained at some functioning level H.J. Krebs

3. 2004 Installation • Schedules do not include any time for: • PPS certification • In the past, this has been 4 days. Presently this is scheduled to begin at the conclusion of the BaBar schedule – October 15. • Tours and photography sessions • In 2002, we lost two days to this • If tours or photography sessions are important, they may occur between midnight and 07:00 or on Sundays • Replacement of any LST detectors that have problems after installation • Any PEP work. • Any BaBar system work • Assumed that this work will occur on Sundays • Drift Chamber crew may have access to DIRC tunnel at any time without interference to LST work • Helicoil replacement • Have had trouble with these in the past • Assume a problem with 1% of helicoils • Means replacing two helicoils in 2004 • Probably a few hours per helicoil replacement H.J. Krebs

4. Flux Return Steel H.J. Krebs

5. 2004 Installation • Flux return steel • Side gap plates • Have removed and reinstalled many times • Very confident in schedule for these tasks • Center gap plates • Have never removed or installed before • Very confident in schedule for these tasks • Corner plates • Have never removed or installed before • Schedule times for these tasks are an educated guess • Test removal of two corner block bolts in summer 2003 • Somewhat easy to remove • Bolt threads appear to be in excellent condition • An unbolting/bolting sequence has been developed • Will track bolts for reinstallation into same location H.J. Krebs

6. 2004 Installation • Flux Return Steel (cont’d) • Flux bar • Have never removed or installed before • Requires tapping two holes in each flux bar in field • Schedule times for these tasks are an educated guess • Solenoid • External radial support arms • Have never removed before • Release magnet supports • Have never done this before H.J. Krebs

7. Solenoid Support Arms H.J. Krebs

8. 2004 Installation • Alignment • Steel position shall be monitored to assure that the barrel assembly is stable • Survey targets added at strategic locations • i.e., on mid corner blocks to see if structure is becoming egg shaped • Take periodic measurements • At beginning for reference • After bolts are loosened on each corner plate • At the beginning of each day • At the beginning of second shift • At the end of each day • At end for final reference • SLAC survey crew still reviewing what is practical here • Solenoid position • At beginning for reference • After final connection and loading of supports to assure that solenoid is located in original position H.J. Krebs

9. 2004 Installation • RPC removal • RPCs are “ripped” out • HV & gas line still connected on BWD end • Time may be lost cleaning the steel gaps of this debris • Bottom RPCs must be ripped loose, then cut, then pulled, then cut, etc. • Not enough space in Z to extract in one piece • RPCs range in weight from approximately 150 pounds for layer 1 to 250 pounds for layer 18 • 3600 sq ft of RPCs will be removed • Cover FWD beamline and detector face for protection • Make certain not to cover any survey monuments H.J. Krebs

10. 2004 Installation • LST hookup & commissioning • 5 days each for upper & lower layer 18 • Continuous checkout for remaining layers during LST installation process • 10 days lower sextant • 9 days upper sextant • Where do items go during the installation process? • Flux return steel and bolts to IR-12 • Platforms and walkways along service road to Building 611 • Main shield wall blocks along the Loop Road • RPCs thrown out in the IR-2 parking lot • Where do items come from during the installation process? • Steel handling fixtures from IR-12 • Elevator platforms from IR-12 • Brass absorber plates from IR-12 • LST detectors from SLD Collider Hall • Electronics and gas system from SLD Collider Hall • IFR shield wall, structural supports, and earthquake supports from IR-12 H.J. Krebs

11. 2004 Installation • IFR background shield wall • New installation – very crane intensive • Requires installation of anchors in south PEP tunnel ceiling • Requires installation of structural supports and earthquake supports H.J. Krebs

12. 2004 Installation • Schedules are based on: • Mechanical installation assumes two 8-hour shifts per day, six days per week – very taxing • LST installation assumes one 10-hour shift per day, six days per week • Mechanical installation team will provide technical support as needed to LST team during this period • Wireway installation, cabling and gas hookup will be performed on owl shift • Installation schedules denote IFR/LST work only • Work by other systems must be performed during owl shift or on Sundays • VESDA system • For first two weeks, fire techs bring system off every morning (six days/wk) at 07:00 • Beginning third week, fire techs bring system off every afternoon at 15:00 (five days/wk) and Saturday morning at 07:00. Fire techs will respond immediately (15 minutes) to bring system down if needed during the day shift • Fire department will bring system back on line at 23:00 six days/wk • Security • There will be no parking allowed during the day shift by the IR-2 delivery area to minimize congestion H.J. Krebs

13. Hall Crew Actual Work Time (Two 8-hour Shifts) H.J. Krebs

14. 2004 Installation Schedule H.J. Krebs

15. 2004 Installation Schedule H.J. Krebs

16. Flux Return Steel H.J. Krebs

17. 2004 Installation H.J. Krebs

18. 2004 Installation Schedule H.J. Krebs

19. 2004 Installation Schedule H.J. Krebs

20. 2004 Installation Schedule H.J. Krebs

21. IFR Shield Wall H.J. Krebs

22. 2004 Installation Schedule H.J. Krebs

23. Critical Path H.J. Krebs

24. Critical Path H.J. Krebs

25. Critical Path H.J. Krebs

26. Critical Path H.J. Krebs

27. Schedule Comments • Additional 4 days of PPS certification at conclusion of BaBar LST work • Pre-run PEP survey work will follow PPS certification – 2 days? • SLAC Computing Services outage presently scheduled for August 16 & 17 • Daily meetings will occur at the commencement of each shift to discuss safety issues and the work list. • A daily meeting will also occur at 15:00 to discuss schedule progress and conflicts H.J. Krebs

28. Potential Schedule Risks • 10 weeks of scheduled work time is needed to replace RPCs with 6 layers of brass absorber and 12 layers of LST detectors in both the top and bottom sextants if NOTHING goes wrong • Some time lost for tours and/or photography is a probability • No time allotted to replace LSTs that are not functioning properly after installation • Many tasks have NEVER been performed previously – could be a long learning curve • Will lose 1:1 on schedule time for any of the above • There may be some schedule optimization possible – but not much. From the critical path it is determined that the schedule is: • Driven by crane usage – 1 crane • Driven by LST installation – 1 installation team • Most everyone is working in the same place – FWD end of barrel • The IFR background shield wall may be more difficult to install than planned • The schedule assumes the acquisition of key personnel from outside of SLAC • We believe we can acquire the needed resources through an agency. This is still an open issue. • There are significant safety concerns and probable negative schedule effects if key individuals are not acquired. H.J. Krebs

29. Potential Schedule Risks • The deformation of the flux return steel may be more than shown by analysis • Bolts may not match bolt patterns • Open Clearance holes in corner blocks • Our tooling may not work as thought – modify during use • Incorrect CGs on handling fixtures • Malfunction of elevator platforms • Potential power outages • Our mechanical installation team is aging • Have some young replacements but not as experienced • A mechanical breakdown of the crane would have an adverse schedule effect • I believe the potential risk to the schedule is VERY HIGH H.J. Krebs