7th International Workshop on Mechanisms of Vacuum Arcs (MeVArc 2018)

Session

Overview/Foundational

21 May 2018, 08:30

Other Institutes

37. Applications of High-Gradient Accelerators

Walter Wuensch (CERN)

21/05/2018, 08:30

Oral (30 minutes)

Prototype accelerating structures are now being built and operated routinely with gradients in excess of 100 MV in test stands which are part of the CLIC TeV-range electron positron collider project. This represents a factor of approximately three beyond the highest gradient linacs in operation today, and is due to a significantly improved understanding of how to design rf structures for high...

39. Review of high voltage breakdown: from multipactor to ionization discharge*

Prof. J. Verboncoeur (Michigan State University)

21/05/2018, 09:00

Oral (30 minutes)

High-voltage breakdown in the vicinity of a dielectric or conducting surface is examined across a wide range of conditions using theoretical and experimental treatments. DC and RF power sources are considered, across a wide pressure range. DC multipactor along an insulating surface can lead to local heating-driven gas desorption and ultimately to gaseous breakdown. In microwave driven systems,...

41. Advancing electrode models for PIC-DSMC simulation of discharge between real electrodes

Chris Moore (Sandia National Labs)

21/05/2018, 09:30

Oral (30 minutes)

We have developed a stochastic surface model for use in Particle-In-Cell Direct Simulation Monte Carlo (PIC-DSMC) simulations of vacuum discharge. In the present work, we simulate breakdown between two parallel Pt plates in which the modelled electrode surface elements are given a local work function and field enhancement factor (β) by drawing values from probability density functions based on...