The International Linear Collider (ILC) positron source uses a helical undulator to generate polarized photons of 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 in a narrow chamber of inner diameter, with a long length of , 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.
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July 2007
Research Article|
June 20 2007
Vacuum systems for the ILC helical undulator
O. B. Malyshev;
O. B. Malyshev
a)
ASTeC,
STFC Daresbury Laboratory
, Warrington, WA4 4AD, United Kingdom and Cockcroft Institute
, Warrington WA4 4AD, United Kingdom
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D. J. Scott;
D. J. Scott
ASTeC,
STFC Daresbury Laboratory
, Warrington WA4 4AD, United Kingdom; Cockcroft Institute
, Warrington WA4 4AD, United Kingdom; and Department of Physics, University of Liverpool
, Oxford St., Liverpool L69 7ZE, United Kingdom
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I. R. Bailey;
I. R. Bailey
Department of Physics,
University of Liverpool
, Oxford St., Liverpool L69 7ZE, United Kingdom and Cockcroft Institute
, Warrington WA4 4AD, United Kingdom
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D. P. Barber;
D. P. Barber
DESY-Hamburg
, Notkestraße 85, 22607 Hamburg, Germany
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E. Baynham;
E. Baynham
STFC Rutherford Appleton Laboratory
, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
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T. Bradshaw;
T. Bradshaw
STFC Rutherford Appleton Laboratory
, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
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A. Brummitt;
A. Brummitt
STFC Rutherford Appleton Laboratory
, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
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S. Carr;
S. Carr
STFC Rutherford Appleton Laboratory
, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
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J. A. Clarke;
J. A. Clarke
ASTeC,
STFC Daresbury Laboratory
, Warrington WA4 4AD, United Kingdom and Cockcroft Institute
, Warrington WA4 4AD, United Kingdom
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P. Cooke;
P. Cooke
Department of Physics,
University of Liverpool
, Oxford St., Liverpool L69 7ZE, United Kingdom
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J. B. Dainton;
J. B. Dainton
Cockcroft Institute
, Warrington WA4 4AD, United Kingdom and Department of Physics, University of Liverpool
, Oxford St., Liverpool L69 7ZE, United Kingdom
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Y. Ivanyushenkov;
Y. Ivanyushenkov
STFC Rutherford Appleton Laboratory
, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
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L. I. Malysheva;
L. I. Malysheva
Cockcroft Institute
, Warrington WA4 4AD, United Kingdom and Department of Physics, University of Liverpool
, Oxford St., Liverpool L69 7ZE, United Kingdom
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G. A. Moortgat-Pick;
G. A. Moortgat-Pick
Institute of Particle Physics Phenomenology,
University of Durham
, Durham DH1 3LE, United Kingdom and CERN
, CH-1211 Genève 23, Switzerland
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J. Rochford
J. Rochford
STFC Rutherford Appleton Laboratory
, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
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a)
Electronic mail: o.b.malyshev@dl.ac.uk
J. Vac. Sci. Technol. A 25, 791–801 (2007)
Article history
Received:
February 05 2007
Accepted:
May 14 2007
Citation
O. B. Malyshev, D. J. Scott, I. R. Bailey, D. P. Barber, E. Baynham, T. Bradshaw, A. Brummitt, S. Carr, J. A. Clarke, P. Cooke, J. B. Dainton, Y. Ivanyushenkov, L. I. Malysheva, G. A. Moortgat-Pick, J. Rochford; Vacuum systems for the ILC helical undulator. J. Vac. Sci. Technol. A 1 July 2007; 25 (4): 791–801. https://doi.org/10.1116/1.2746876
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