Vacuum systems for the ILC helical undulator

Journal Article · Sun Jul 15 00:00:00 EDT 2007 · Journal of Vacuum Science and Technology. A, International Journal Devoted to Vacuum, Surfaces, and Films

DOI:https://doi.org/10.1116/1.2746876· OSTI ID:20979496

Malyshev, O B; Scott, D J; Bailey, I R; Barber, D P; Baynham, E; Bradshaw, T; Brummitt, A; Carr, S; Clarke, J A; Cooke, P; Dainton, J B; Ivanyushenkov, Y; Malysheva, L I; Moortgat-Pick, G A; Rochford, J ^[1]; CERN, CH-1211 Geneva 23 ^[2]

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1. ASTeC, STFC Daresbury Laboratory, Warrington, WA4 4AD (United Kingdom)
2. Switzerland

The International Linear Collider (ILC) positron source uses a helical undulator to generate polarized photons of {approx}10 MeV at the first harmonic. Unlike many undulators used in synchrotron radiation sources, the ILC helical undulator vacuum chamber will be bombarded by photons, generated by the undulator, with energies mostly below that of the first harmonic. Achieving the vacuum specification of {approx}100 nTorr in a narrow chamber of 4-6 mm inner diameter, with a long length of 100-200 m, makes the design of the vacuum system challenging. This article describes the vacuum specifications and calculations of the flux and energy of photons irradiating the undulator vacuum chamber and considers possible vacuum system design solutions for two cases: cryogenic and room temperature.

• OSTI ID: 20979496
• Journal Information: Journal of Vacuum Science and Technology. A, International Journal Devoted to Vacuum, Surfaces, and Films, Vol. 25, Issue 4; Other Information: DOI: 10.1116/1.2746876; (c) 2007 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1553-1813
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
DESIGN
GAMMA RADIATION
LENGTH
LINEAR COLLIDERS
MEV RANGE
PHOTONS
POLARIZATION
POSITRON SOURCES
SPECIFICATIONS
SYNCHROTRON RADIATION
SYNCHROTRON RADIATION SOURCES
TEMPERATURE RANGE 0273-0400 K
VACUUM SYSTEMS
WIGGLER MAGNETS