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PROPOSED RESEARCH PROGRAM

PROPOSED RESEARCH PROGRAM. This programs aims to develop better means to produce RF cavities in order to optimise: Achievable accelerating gradients Reproducibility

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PROPOSED RESEARCH PROGRAM

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  1. PROPOSED RESEARCH PROGRAM This programs aims to develop better means to produce RF cavities in order to optimise: • Achievable accelerating gradients • Reproducibility It is essential to examine the effects of each manufacturing technique on the quality of the metallic surface, where limiting factors can be developed. This will be achieved through a series of experimental and simulation work, aimed to provide a better understanding of such factors.

  2. Button Experiment • A series of high power button tests, where different techniques are to be evaluated. • Progress: • Button and transport jig designs are finalised • Cold drawing and normal EP mixture chosen as the initial techniques • 20 caps and transport jigs are manufactured • 4 caps EP polished

  3. Simulation This work focuses on the RF breakdown model proposed by Jim Norem, where RF breakdown is a direct result of field enhancement at the tip on an asperity. The proposed model setup allows to investigate the effects of a single and multiple defects in a small surface area

  4. Simulation Simulation would be carried out in 3 phases: • Phase 1: Studies the field enhancement characteristics of simple shaped defects. Looking into the generated stresses and heating • Phase 2: Looks into the stresses and heating, taking into account the effects of magnetic field • Phase 3: Looks into the relation between field enhancement and the asperity geometry. The shape, and position of defects are to be changed.

  5. Future Developments Experiment: • Bach 1 polishing, characterizing (May 2008) • Bach 1 High Power test at Fermilab (Date TBC, due to problems with the 805 MHz cavity) • Introduction of further techniques such as spinning and more complex EP mixture (August 2008) Simulation: • Finalizing the model setup and operating parameters (June 2008) • Running phase 1 and refining model setup (June-July 2008) • Phase 2 and phase 3 (October-November 2008)

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