| Paper |
Title |
Page |
| MOPKF064 |
Design Considerations for a Helical Undulator for the Production of Polarised Positrons for TESLA
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458 |
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- D.J. Scott, S.C. Appleton, J.A. Clarke, B. Todd
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- E. Baynham, T.W. Bradshaw, S.C. Carr, Y. Ivanyushenkov, J. Rochford
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
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An efficient and simple method for the production of positrons, in the necessary quantities, is one of the problems facing proposals for any future e+ e- Linear Collider project. The possibility of colliding polarised beams would also be an advantage. One method to produce a polarised positron beam uses circularly polarised radiation generated by the main electron beam passing through a helical undulator. Design considerations and calculations for two undulators, based on super-conducting and pure permanent magnet technologies, for the TESLA machine, are presented.
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| TUPKF049 |
Combining Cavity for RF Power Sources: Computer Simulation and Low Power Model
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1060 |
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- E. Wooldridge, S.C. Appleton, B. Todd
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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A combining cavity for RF power sources has been investigated as a way of saving space, in comparison to waveguides, and as a way of combining power with graceful degradation if one or more component were to fail. The cavity has been investigated as the maximum power output of an Inductive Output Tube (IOT) for CW is 80KW at 500MHz and a proposed output of 20KW at 1.3GHz and most RF systems for particle accelerators require much more than this. Although 1.3GHz klystrons do exist they are vastly more expensive to purchase and maintain. Also the down time could be minimised to minutes in the even of a single IOT failure where as a klystron has a minimum downtime of several days in the event of a failure. Initially the cavity and its inputs were simulated in CSTs? Microwave studio. After optimising the cavity to ensure the minimum reflection at the input ports and maximum transmission at the output port, a low power model was then created from aluminium. Signal generators were used to power the model and a network analyser was used to check the output. The model was used to compare the results gained from the computer simulation and to obtain results from asymmetric positioning of the ports, which was not possible in the simulation.
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