  A flux compression generator (FCG) is a device generating a high-power
electro-magnetic pulse by compressing magnetic flux with the help of explosion.
The physical properties of components and materials used for FCG manufacturing
and available on the market (wires, explosives, liners (armatures), etc.) might
differ from those originally used for FCG design. As a result, the output
parameters of the manufactured generator (e.g. maximum output power) could
deviate from the pre-calculated values. Simple formulas are derived to enable
evaluation of change in output power delivered to a purely inductive load from
a helical flux compression generator in case when the wire insulation thickness
or the detonation velocity of explosive or load inductance $L_l$ are changed.
The obtained formulas establish acceptable tolerances for FCG components
produced by a third-party manufacturer. Design requirement is proposed to
ensure minimal dependence of the output power delivered to the purely inductive
load when its inductance is varied a bit. The proposed approach implies
approximate equality of load inductance and the residual FCG inductance at the
instant, when the output power is maximal.
