1. LINACs Michael Bevins May 17, 2007 12GeV Upgrade - Beam Transport Injection, Linac, Extraction, & Correctors Preliminary Design and Safety Review

2. Outline Introduction & Scope Requirements & Specifications New/Modified Linac Elements/Girder Count Beam Transport Layouts Safety Considerations Cost Estimates Risk Assessment Summary

3. Introduction & Scope The12GeV upgrade requires an additional ten cryomodules –Five in the north linac and five in the south NEW modules are longer than the original CEBAF modules –Result: Warm region girders downstream of the new modules must be replaced with a new short girder Like downstream of SL21 12GeV field strength requirements force us to replace two QB quads at the start of the linac with QCs Songsheet level machine layouts, QB to QC mod, and the short warm region girder will be presented along with cost estimates –Only modified sections of the LINACs will be included in this presentation

4. Requirements & Specifications Alignment specs –Quads positioned to +/-0.5mm in x & y, +/- 1.0mm in z Vacuum specs –Pre linac: (at MQB1L00 & 01) Beam line partial pressure of hydrogen <10-6 torr Total average pressure of all other constituents less than 5x10-7 torr –Warm region girders between cryomodules UHV Fabrication, welding, cleaning & handling, and leak checking specs still apply –22631-S-001 Fabrication of Ultra-High Vacuum Equipment –22632-S-001 Cleaning and Handling of U.H.V. Components –22633-S-001 Welding Specification For U.H.V. Components –22634-S-001 Helium Leak Test For U.H.V. Components –Note an update and modernization of our vacuum specs is underway

5. New/Modified Linac Elements/Girder Count Elements in red are part of I&C WBS

6. Beam Transport Layouts – N&S Linac North Linac 1 st Section –QB to QC change at MQB1L00 & 01 N&S Linac Sections 3 & 4 –Add new modules in zones 22 through 25 –Replace warm region girders with new short girder North Linac South Linac

7. Beam Transport Layouts – QB to QC change MQB1L00 & MQB1L01 girder modifications –Replace QB quads with higher strength QCs –Shift MQB1L00 stand 4 inches upbeam to improve girder stability –Shift MQB1L01 upbeam 7.6cm from 12GeV dimad position View looking upbeam to MQB1L00 & 01 girders MQB1L00MQB1L01

8. Beam Transport Layouts – N&S Linac New module Four New modules Layout of new modules & girders in linac Current Configuration (Zones 19 – 22) 12GeV Configuration (Zones 19 – 22) Current Configuration (Zones 23 – 26) 12GeV Configuration (Zones 23 – 26) Five New warm girders DP station moved to end of linac Replace module baseplates

9. Beam Transport Layouts – Warm Region Girders Old warm region girder New short warm region girder Viewer & pump drop cross H&V nested Air Core correctors over BPM Quad Existing baseplate New stand Warm girder design reviewed in Oct 2004 Prototyped and installed at SL21 Designed to accommodate multiple combinations of cryomodule configurations Quad, BPM, and alignment cartridges will be reused on new short girders

10. Safety Considerations Personnel Training –Jlab & sub-contractor Radiation –Designated areas for containment and radiation survey of material that will be removed from the tunnel Material handling –Provide provisions for lifting Electrical Hazards –Package and support electronics, power leads and terminal blocks to control electrical hazards

11. Cost Estimates – LINAC WBS Rollup WBS Elements I have covered today

12. Cost Estimates - Highlighted WBS Girder & Stand Procurements * Warm girder qty includes one spare * Warm girder cost reviewed as part of Quad review on May 3 rd 2007

13. Risk Assessment Technical - Low –Girders & Supports – very similar designs exist and are already proven –Warm region girder prototyped and installed at SL21 –Alignment - same as existing machine Procurement Schedule - Low –No long-lead items identified Cost – Low –Linac warm region girder recently prototyped –Good cost estimates for machined parts Vendor & Jlab shop budgetary estimates

14. Summary Preliminary LINAC beam transport layouts, cost and installation estimates to support CEBAF at 12GeV are complete based on present scope We are in a good position to support our DOE External Project Reviews this summer We will continue to work closely with our friends throughout the lab (safety, CASA, installation, vacuum, alignment, RadCon, I&C, magnet measurement, operations, procurement & facilities) as we move forward Detailed design will be completed to support assembly and installation schedules We look forward to comments & recommendations from the committee