cornell erl vacuum system as a model for ilc damping vacuum system conceptual design yulin li &...
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Cornell ERL Vacuum System as a Model for ILC Damping Vacuum System Conceptual Design
Yulin Li & Joe ConwayCornell Laboratory for Accelerator-based Sciences and Education
Cornell University, Ithaca, New York, USA
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6” of Snow on 4/23 Ithaca
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• There are similarities between the proposed Cornell ERL vacuum system and the ILC DR’s
• Significant conceptual design work were done in the Cornell ERL vacuum system, such as basic building blocks and chamber, pumping and gauging, etc.
• A extensive cost estimate was recently commissioned by Research Instrument (an German consulting company, April 2010), based on solicited vendor quotes, using Cornell designs
• Designs from other institutes are also employed here
Outline – Why talking about Cornell ERL?
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Cornell ERL Studies
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Cornell ERL Studies
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Cornell ERL Layout and Basic Specification
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Building Blocks for DR Vacuum System• Majority of vacuum chambers (drift beampipes, dipole and multi-
pole vacuum chambers) are to be constructed from aluminum extrusions.
• Ante-chamber is to be incorporated in the extrusions, to minimize primary SR photons in the beam apertures
• Distributed pumping with NEG strips is the primary vacuum pumping, with sufficient discrete sputtering-ion pumps for start-up and for handling NEG activations
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Chamber Design Examples – I
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Chamber Design Examples – II
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Chamber Design Examples – III
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Chamber Design Examples – IV
A: Alum/SST TransitionsB: NEG PortC: BPMsD: RF Gap Ring
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SR-Induced Gas-Load
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SR-Induced Gas-Load
with = 0.6 ~ 1.0
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Pressure Profile Calculations
Arcs (TA/TB)& “Drifts’ (IDs)
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NEG Strip Pumping Capacity• In the Cornell ERL vacuum
system design, sufficient NEG pumping capacity is build in to provide adequate running period between activations
• ILC DR design need to a similar estimation
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Brief Summary – More to Come
• Used Cornell ERL vacuum system conceptual design as a model for ILC DR vacuum system cost estimation
• Similar vacuum pumping for arcs and drifts is figured in the ILC DR design.
• For locations with very high dynamic gas load (such as the photon absorbers for the wigglers), high capacity TiSPs are used.
• See more from Joe’s presentations