  The observed scaling of neutron yield in the Dense Plasma Focus (DPF) as the
fourth power of the current in the plasma was the principal driver of the
growth of DPF research in its early days. Subsequent discovery of failure of
this scaling law was also the principal reason for its abandonment by major
laboratories. Attempts to understand this failure of scaling have so far been
inconclusive. This letter looks at this failure in the context of the recently
introduced Generalized Plasma Focus (GPF) problem and suggests a possible
reason that can be experimentally examined using small plasma focus devices.
This involves restrictions placed on the drive parameter by conservation laws
for mass, momentum and energy. A suggested empirical workaround to the problem
of neutron yield scaling failure could also be configured as a method for
increasing the pressure range for neutron emission in small DPF devices.
