Speaker
Description
As part of the FCC feasibility studies, it is observed that vacuum breakdown rates in septa systems are significantly higher than expected. The electric fields there are much lower than in many high field applications, such as CLIC where 100 MV/m macroscopic fields are exploited. This is in stark contrast with previous observations but can be explained by the fact, that strong X-ray radiation is present in these systems due to the synchrotron radiation.
In this study we follow the hypothesis that vacuum breakdowns are initiated by the formation of surface protrusions, created due to biased adatom diffusion in high electric field. We initially hypnotize that X-ray radiation will create sufficient amount of adatoms on the surface, finally leading to the formation of sufficiently large surface modifications. We combine molecular dynamics, finite element analysis and X-ray simulations with Fluka to demonstrate strong foundation of this hypothesis. As such we see that X-ray radiation can act as catalyst of vacuum breakdown, providing strong support for the theory that biased diffusion is fundamental mechanism behind the initiation of vacuum breakdowns.
| Please choose topic that matches most closely your research | Modeling and simulations |
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