Two surface multipactor discharge with two-frequency rf fields and space-charge effects

Frequency response of multipactor discharge

This paper analyzes the frequency response of a two-surface multipactor in a rf circuit. An equation for the frequency band in which steady state multipactor can occur is derived in terms of the secondary emission properties of the surface, the quality factor Q of the rf circuit, and the operating voltage. The steady-state multipactor current is also derived, and is shown to be in excellent agr...

Tracking Particles with Wake Fields and Space Charge Effects

A simple and precise way to account for beam cavity interactions is the use of delta wake potentials known from RF calculations or measurements. When this procedure is introduced in a tracking program following super-particles such as in PARMELA, besides the effect of the space charge, the evolution of the charge distribution within the bunches of a train can be determined. The interesting appl...

Theory of space‐charge polarization and electrode‐discharge effects

Temporal Evolution of Multipactor Discharge

Multipactor is an important resonant discharge phenomenon on which there have been surprisingly few publications in the open literature. Here, we extend the theoretical analysis of an idealized model. Emphases have been placed on the mutual interactions between the multipactor discharge and the rf. We show that the multipactor current may reach a very high level, transiently, before it settles ...

Finite element modeling of a two-fluid RF plasma discharge

The design and understanding of plasma and its bounding sheath requires an effective modeling technique that is both adaptable to arbitrary geometry and time accurate. We present a finite-element-based model for two-fluid plasma. The continuity and momentum equations for electrons and ions are solved simultaneously with the Poisson equation, using an efficient subgrid-embedded algorithm. The mo...