The microwave source algorithms take as input parameters the voltage,
impedance, energy per pulse, pulse shape and repetition rate from the
pulsed power algorithm. Providing a model for the impedance of the source
makes the connection between the pulsed power and the microwave source.
This model is based on either theoretical models or experimental data and
varies a great deal among the sources. Given this impedance, the voltage
and current through the source can be determined. Diode voltage is
determined by making a voltage correction due to the inductance of the
vacuum tube and magnetically insulated transmission line. HEIMDALL then
proceeds to calculate the microwave power using an efficiency, which can
chosen by the user, or assumes a default value based on experimental
practice. The algorithm defines the pulse duration by taking account of:
1) duration from onset and termination times for each device 2) duration
limitation due to microwave breakdown and 3) duration set by gap closure.
The size and weight of the components of the source are determined from
physics, rules of thumb and experimental practice. The major variable in
determining size and weight is the required frequency. The user can select
several types of materials to build the device from, thus allowing
lightweight systems to be evaluated.
The reltron is one of the HPM sources that are modeled by Heimdall, is made
by L-3 Communications Pulse Sciences.