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Investigation of Optimised Electromagnetic Fields in SRF Cavities for the ILC
[Thesis]. Manchester, UK: The University of Manchester; 2012.
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The International Linear Collider (ILC) project aims at colliding electrons and positrons at an initial centre of mass energy of 500 GeV with high luminosity, and thus will allow scientists to probe new energy regimes. A general consensus within the accelerator physics and particle physics community has been made to utilise superconducting technology rather than normal conducting technology. A superconducting radio frequency (SRF) cavity will be used to accelerate bunches of particles to the design energy before delivering them to an interaction point. The major financial cost of the ILC lies in the area of the main linacs. These linacs consist of nine-cell cavities and are based on the TESLA design. An option being considered to reduce the overall footprint and project cost is to enhance the cavity gradient. This research concerns itself with my new cavity design with a view to reaching higher gradients. This design is focussed on minimising the surface electromagnetic fields and maximising the bandwidth of the accelerating mode. This new shape, which is referred to as the New Low Surface Field (NLSF) design, bears a similarity to the current Ichiro and Reentrant designs. A design of a complete nine-cell cavity, including power couplers and higher order mode damping couplers is presented. An equivalent circuit model theory is applied to represent the radio frequency (rf) mode properties of the cavity for both the fundamental accelerating mode and higher order modes. This represents an almost complete design, including HOM damping, for a unique high gradient superconducting cavity.