
5 Enabling Technologies 155
τ
=
r
(5.6)
where:
L is the line length
c is the light speed
Two principal types of PFL systems are used in HPM. The rst is a Marx directly charging a PFL
(Figure5.6). The Marx generator is an assembly of capacitors that are charged in parallel and then
quickly switched (discharged) into a series circuit, allowing the original charging voltage to be multi-
plied by the number of capacitive stages in the Marx. Marx generators are usually insulated with trans-
former oil to reduce their size. The PFL is switched into the load through a high-voltage closing switch.
The other pulse line scheme uses a capacitor bank at ...