Speaker
Description
The UK XFEL (UK X-ray Free Electron Laser) is a proposed accelerator facility that will use predominantly superconducting RF structures to accelerate and manipulate the transiting electron bunches. Errors in manufacturing and assembly of these Niobium RF cavities can lead to certain modes becoming frequency degenerate and mode mixing can occur, whereby the component modes combine to form additive and subtractive super-positional field distributions. Here we look at the mixing of monopole TM0nm modes and locate problem combinations where there is a high on-axis E-field that is unable to couple out significantly via the cell irises, leading to mixed modes becoming trapped and perturbing subsequent bunches. The trapped monopole modes’ effect on energy spread is considered, as this is a key FEL design parameter and needs to be controlled.
| In which format do you inted to submit your paper? | LaTeX |
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