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| MOPP069 |
A Prototype Target Wheel for the ILC Positron Source
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706 |
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- I. R. Bailey, L. J. Jenner, C. J. Nelson
Liverpool University, Science Faculty, Liverpool
- I. R. Bailey
Cockcroft Institute, Warrington, Cheshire
- D. G. Clarke, K. P. Davies, A. Gallagher
STFC/DL, Daresbury, Warrington, Cheshire
- J. A. Clarke
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- J. Gronberg, L. B. Hagler, W. T. Piggott
LLNL, Livermore, California
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In this paper we describe the design, construction and commissioning of a prototype based on the positron production target wheel planned for the ILC positron source. The efficiency of the current baseline positron source design for the ILC can be improved if the conversion target is partially immersed in the magnetic field of the capture optics, thereby increasing the overall capture efficiency for positrons by a factor of two or more. However, immersion of the rotating target wheel generates strong eddy currents leading to additional heating and stresses on the wheel. The primary purpose of our prototype, which had been assembled at Daresbury Laboratory, is to investigate the effects of eddy currents induced in a titanium alloy wheel moving with rim speeds up to 100 metres per second in magnetic fields of the order of 1 Tesla.
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| MOPP072 |
A Study of Mechanical and Magnetic Issues for a Prototype Positron Source Target
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715 |
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- L. J. Jenner, I. R. Bailey
Cockcroft Institute, Warrington, Cheshire
- D. G. Clarke, K. P. Davies, A. Gallagher
STFC/DL, Daresbury, Warrington, Cheshire
- J. A. Clarke
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- J. Gronberg, L. B. Hagler, W. T. Piggott
LLNL, Livermore, California
- S. Hesselbach
Durham University, Durham
- C. J. Nelson
STFC/RAL, Chilton, Didcot, Oxon
- J. Rochford
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
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In order to construct a high yield, positron source that can meet the intensity requirements of future facilities, a robust conversion target is needed. One solution is to use a rotating titanium alloy wheel upon which a beam of photons is incident. The efficiency of capturing the resulting positrons can be optimised by immersing this system in a magnetic field. As described elsewhere*, a prototype of such a target has been built at Daresbury Laboratory, to investigate the mechanical challenges associated with its construction and to study the magnetic effects that the wheel will experience. In this paper, calibration of the instrumentation, the data acquisition system and the initial results from operating the wheel in a strong magnetic field are described. Such phenomena as the eddy current heating experienced by the wheel are measured and compared to results from modelling codes. Vibrational issues surrounding the wheel and supporting structure at various speeds are studied.
*ID: 3894 A Prototype Target Wheel for the ILC Positron Source
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| WEOBG03 |
The Design of the Positron Source for the International Linear Collider
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1915 |
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- J. A. Clarke, O. B. Malyshev, D. J. Scott
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- I. R. Bailey, J. B. Dainton, K. M. Hock, L. J. Jenner, L. I. Malysheva, L. Zang
Liverpool University, Science Faculty, Liverpool
- E. Baynham, T. W. Bradshaw, A. J. Brummitt, F. S. Carr, A. J. Lintern, J. Rochford
STFC/RAL, Chilton, Didcot, Oxon
- V. Bharadwaj, J. Sheppard
SLAC, Menlo Park, California
- A. Bungau
UMAN, Manchester
- N. A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire
- R. Dollan
Humboldt Universität zu Berlin, Berlin
- W. Gai, Y. Ivanyushenkov, W. Liu
ANL, Argonne, Illinois
- J. Gronberg, W. T. Piggott
LLNL, Livermore, California
- A. F. Hartin
OXFORDphysics, Oxford, Oxon
- S. Hesselbach, G. A. Moortgat-Pick
Durham University, Durham
- K. Laihem, S. Riemann, A. Schaelicke, A. Ushakov
DESY Zeuthen, Zeuthen
- T. Lohse
Humboldt University Berlin, Institut für Physik, Berlin
- A. A. Mikhailichenko
Cornell University, Department of Physics, Ithaca, New York
- N. C. Ryder
University of Bristol, Bristol
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The high luminosity requirements and the option of a polarized positron beam present a great challenge for the positron source of a future linear collider. This paper provides a comprehensive overview of the latest proposed design for the baseline positron source of the International Linear Collider. We report on recent progress and results concerning the main components of the source: including the undulator, collimators, capture optics, and target.
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