Advances in Classical Field Theory

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Classical field theory is employed by physicists to describe a wide variety of physical phenomena. These include electromagnetism, fluid dynamics, gravitation and quantum mechanics. The central ...
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Variational analysis of electromagnetic fields in closed and open structures

Pp. 86-101 (16)

DOI: 10.2174/978160805195311101010086

Author(s): Asher Yahalom

Abstract

Possible variational principles for excitation of an electromagnetic field in a wave guide are discussed. Our emphasis is not on the calculation of the modal shapes, which is common in previous art, but rather on the calculation of modal amplitude evolution, which are important in electron devices such as free electron lasers and gyrotrons. The variational formalism allows us to show that the electromagnetic field can be defined by a single complex function.