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High pressure over volted gas switches operating from 200 to 350 atmospheres are capable of switching speeds on the order of a few picoseconds [l]. The successful operation of such switches depends upon the application of voltage to the switch within a time duration of a few nanoseconds.This rapid application of voltage is required to achieve the over voltage stress necessary for the picosecond range speed of the switch.In order to apply the voltage to the switch and pulse forming line (PFL) within this nanosecond charging time constraint, a technique using transmission line charging is used.It is possible to charge a subnanosecond PFL in a few nanoseconds using a longer PFL with a higher impedance.The energy transfer efficiency can be as high as 81 percent when the optimum choice of parameters is selected.In the coaxial configuration it is advantageous to use a Blumlein as the source PFL. If the ratio of the source line impedance to the output PFL impedance is Nz and the ratio of the source line delay time to the output PFL delay time is Nt, then the following approximate relations hold. The maximum energy transfer of 81.5 percent occurs when NtfNz is approximately 0.65. The maximum peak power of the output PFL occurs when NtfNz is 1.3 or higher but energy transfer efficiency suffers.

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