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- J. Norem
ANL, Argonne, USA
- Z. Insepov, S. Nurkenov
Nano Synergy, Inc., Downers Grove, USA
- A. Moretti
Fermilab, Batavia, USA
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We describe our vacuum arc model and use it to explain the effects of magnetic field, frequency, stored energy, and other factors on the behavior of linac cavities. The model divides the breakdown process into four stages: trigger, plasma formation, plasma evolution and surface damage. The model should apply to arcs in a variety of environments, including laser ablation, tokamak edge plasma, micrometeorites and perhaps electron beam welding. We use PIC, Molecular Dynamics (MD), and finite element mesoscale thermodynamics codes to model all stages of the arc and find that the properties of surface cracks and unipolar arcs can explain most of the experimental data, and we are trying to extend the range of predictions to estimates of beam deflections, surface damage, cavity dimensions and other experimental phenomina
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