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NLC Beam Delivery

NLC Beam Delivery. Lehman Review, May 1999 Vacuum System Cost Model Presentation by Leif Eriksson. NLC Beam Delivery Vacuum: Presentation Content. Systems Presentations, WBS numbers Base Line Specifications Material Choices Base Pressure Calculations and Pressure Profiles

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NLC Beam Delivery

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  1. NLC Beam Delivery Lehman Review, May 1999 Vacuum System Cost Model Presentation by Leif Eriksson

  2. NLC Beam Delivery Vacuum:Presentation Content • Systems Presentations, WBS numbers • Base Line Specifications • Material Choices • Base Pressure Calculations and Pressure Profiles • Component Specification and Choices • Costing Procedure and System Costs • R&D • Summary

  3. NLC Beam Delivery is located between e- and e+ Linac. NLC Beam Delivery is sub-divided in: Collimation Area, WBS 115 Interaction Region Transport Line 1, IRT 1, WBS 116 Interaction Region 1, IR 1, WBS 117 Interaction Region Transport Line 2, WBS 118 Interaction Region 2, IR 2, WBS 119 NLC Beam Delivery Vacuum:System Presentation

  4. Must have: Base Pressure 5E-7 Torr in the Collimation Area [ZDR] Base Pressure 5E-8 Torr in the Big Bend Area [ZDR] Base Pressure 5E-9 Torr in the Final Focus Area [ZDR] Low electrical resistance Small aperture, ~ 1/2” ID Uniform, smooth transition, inner diameter Specials: Big Bend, absorb synchrotron radiation, 31.4 W/m @ 500 GeV NLC Beam Delivery Vacuum: Baseline specs

  5. NLC Beam Delivery Vacuum: Materials • Materials to chose from: • Stainless steel, low outgassing, cheap • Aluminum, low outgassing, cheap, good conductor, easy to extrude • Copper, low outgassing, good heat absorber, good conductor, easy to extrude

  6. NLC Beam Delivery Vacuum: Pressure calculations

  7. NLC Beam Delivery, Vacuum:Pump Spacing & Pressure Profile • Outgassing rate 1.00E-12 Torr ltrs/s/cm2, (Cu, 304&316) • ID= 1.1 cm • Maximum distance between pumps to maintain a maximum pressure of 5.0E-08 Torr: • 13 meters • With an outgassing rate of 5.00E-11 Torr ltrs/s/cm2, (Al), the distance between pumps is reduced to 2 meters

  8. NLC Beam Delivery, Vacuum:Pump Spacing & Pressure Profile • Outgassing rate 1.00E-12 Torr ltrs/s/cm2, (Cu, 304&316) • ID= 3.00 cm • Maximum distance between pumps to maintain a maximum pressure of 5.0E-08 Torr: • 32 meters • With an outgassing rate of 5.00E-11 Torr ltrs/s/cm2, (Al), the distance between pumps is reduced to 11 meters

  9. NLC Beam Delivery, Vacuum: Components - 1 • PUMPS • The NLC Beam Delivery vacuum system is ion pumped. • Pump size is 30 l/s. • BEAM LINE • All vacuum seals in areas in direct contact with the beam must be all-metal. • Flange connections will be used only in component dense areas. • Where the component density is low the beam line sections will be welded/brazed together in situ.

  10. NLC Beam Delivery Vacuum: Components - 2 • GAUGES • One gauge assembly measuring total pressure from atmospheric pressure to 2E-10 Torr, every 250m. The gauges must be radiation hardened. • Every beam line section must have a gauge combination, as described above, on both sides of a beam line isolation valve. • VALVES • The beam line isolation valves are all-metal valves of VAT type, radiation hardened. • The valves are located 250 m apart. • All metal right angle valves, 2 3/4“ CFF should be provided every 50m

  11. NLC Beam Delivery Vacuum: Components - 3 • TUNNEL ACCESS • Access to the tunnel will be provided every 500m. • A power supply/Control vault will be provided adjacent to the tunnel access, on the ground level. No cable length from a beam line vacuum device to the power supply/ controls vault should have to be longer than 300m. • VACUUM CONTROL ROOM • The NLC Beam Delivery System should have a centrally located vacuum control room.

  12. NLC Beam Delivery Vacuum:Costing Procedure

  13. WBS 11525, Collimation Total, $24,616,028.00 Material $20,361,028.00, 83% ED&I $4,255,000.00, 17% WBS 11625, IRT 1 Total, $25,691,366.00 Material, $20,911,366.00, 81% ED&I, $ 4,780,000.00, 19% WBS 11725, IR 1 Total, $20,618,000.00 Material $15,516,000.00, 75% ED&I $5,102,000.00, 25% NLC Beam Delivery Vacuum:Cost, execution phase

  14. NLC Beam Delivery Vacuum:R&D • Material research, copper vs. aluminum • Investigate outgassing rates for both materials. • Investigate thermal properties of various beam line material profiles and how to absorb the heat load from the synchrotron radiation in the Big Bends. • Joining techniques for copper and aluminum • Investigate orbital welding techniques for extruded beam line materials. • Investigate other joining techniques for beam line materials. • Cost break down • Material cost, pumps, leak detectors, misc.. hardware, $50,000 • One FTE engineer, 1 yr.'s, 2000 hr’s x $55 = $110,000 • TOTAL: $160,000

  15. NLC Beam Delivery Vacuum:Summary • We have a conceptual design for the NLC Beam Delivery vacuum system. • We understand the pressure requirements and the pressure profile. • We have an order-of-magnitude cost estimate for the execution phase. • We have identifies areas in the conceptual design that need more R&D. • We are ready to enter the next phase of engineering and R&D for the NLC Beam Delivery Vacuum System

  16. NLC Beam Delivery Vacuum: Reference text • All of the presented material is available for downloading from: • http://www-sldnt.slac.stanford.edu/nlc/beamdeliveryhome.htm • See under: Issues\Engineering • A beam line schematic is also available at this location

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