Injection linac extraction correctors preliminary design and safety review
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12GeV Upgrade - Beam Transport. Injection, Linac, Extraction, & Correctors Preliminary Design and Safety Review. LINACs Michael Bevins May 17, 2007. Outline. Introduction & Scope Requirements & Specifications New/Modified Linac Elements/Girder Count Beam Transport Layouts

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Injection linac extraction correctors preliminary design and safety review

12GeV Upgrade - Beam Transport

Injection, Linac, Extraction, & CorrectorsPreliminary Design and Safety Review


Michael Bevins

May 17, 2007


  • Introduction & Scope

  • Requirements & Specifications

  • New/Modified Linac Elements/Girder Count

  • Beam Transport Layouts

  • Safety Considerations

  • Cost Estimates

  • Risk Assessment

  • Summary

Introduction scope
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

Requirements specifications
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

New modified linac elements girder count
New/Modified LinacElements/Girder Count

  • Elements in red are part of I&C WBS

Beam transport layouts n s linac

North Linac

South Linac

Beam Transport Layouts – N&S Linac

  • North Linac 1st 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

Beam transport layouts qb to qc change
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



Beam transport layouts n s linac1
Beam Transport Layouts – N&S Linac

Layout of new modules & girders in linac

DP station moved to end of linac

Current Configuration (Zones 19 – 22)

12GeV Configuration (Zones 19 – 22)

New module

Replace module baseplates

Current Configuration (Zones 23 – 26)

12GeV Configuration (Zones 23 – 26)

Five New warm girders

Four New modules

Beam transport layouts warm region girders
Beam Transport Layouts – Warm Region Girders

  • 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

H&V nested Air Core correctors over BPM

Viewer & pump drop cross


New stand

Existing baseplate

New short warm region girder

Old warm region girder

Safety considerations
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

Cost estimates linac wbs rollup
Cost Estimates – LINAC WBS Rollup

WBS Elements I have covered today

Cost estimates highlighted wbs
Cost Estimates - Highlighted WBS

Girder & Stand Procurements

* Warm girder qty includes one spare

* Warm girder cost reviewed as part of Quad review on May 3rd 2007

Risk assessment
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


  • 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