Publication Date


Advisor(s) - Committee Chair

George Moore, Curtis Logsdon, N.F. Six

Degree Program

Department of Physics and Astronomy

Degree Type

Master of Science


In microwave power triodes the grid drive power causes grid lateral wire heating. This development calculates the temperature of the wire as a function of the drive power, physical dimensions and characteristics of the wire material, for the following boundary conditions:

I. Constant grid drive, grid lateral wire of infinite length not connected to a heat sink.

II. Same as I except the wire is of finite length brazed to a grid frame.

III. The grid excitation in the form of pulses, and the grid lateral wire of finite length brazed to a grid frame.

the equations were verified experimentally by calculating the temperature of a rod whose surface was heated in a vacuum and the temperature measured. The equations were also used to estimate the grid drive power necessary to melt tungsten lateral wire in a microwave power triode, GE18651. The repeated use of LaPlace and Fourier transforms. the Dirac impulse function and convolution integral are the principal mathematical tools used to solve the conduction equations.


Engineering Physics | Physical Sciences and Mathematics | Physics