Crossed-field flows

Study of Crossed-field Ampufiers

Printed-Circuit RF-Keyed Crossed-Field Amplifier

This report describes an experimental and theoretical study of an RFkeyed linear format Crossed-Field Amplifier,(CFA), using a printed-circuit slow-wave structure. The theoretical results indicate that higher interaction impedances than have presently been obtained with printed-circuit slow-wave structures will be required to achieve the goal of low RF-keying levels. Experimental results indica...

Limiting current density in a crossed-field nanogap.

Using a mean-field theory, we have studied the quantum extension on the limiting current density in a crossed-field nanogap. When the gap spacing is less than the electron wavelength, our results show that the limiting current density is increased by a large factor from the classical values due to the effects of electron tunneling. The effects of the external magnetic field diminish with a decr...

Structured Topological Field Theories via Crossed Simplicial Groups

We show how the framework of crossed simplicial groups may be used to provide a classification of topological field theories on open cobordism categories defined by reductions of the structure group to a planar Lie group. Such theories are equivalent to algebras equipped with a group action and a non-degenerate trace satisfying certain invariance requirements which generalize the notion of a fr...

Rapid Current Transition in a Crossed-Field Diode

The transmitted current in a crossed̄eld gap has been characterized analytically by a number of authors [1], [4], [6] and [7]. Using a one dimensional PIC simulation, PDP1 [9], we explore the behavior of the crossed̄eld diode at B = BHull. For mono-energetic (cold) emission, a rapid reduction of transmitted current is observed when the injected current exceeds the critical current by just 1%. Add...