found empirically, because NSTs are not ideal AC power supplies. Note that in practice charging may occasionally occur for longer (or shorter) than a quarter cycle, depending on the spark gap and load behavior, which can lead to larger charging voltages than the power supply rating.

The estimated erected Marx bank capacitance for the arrangement of Fig. 2(a) with the solenoid is 37 pF, and for that of Fig. 2(b) without the solenoid is 38.5 pF. In practice, the total erected capacitance will include additional capacitance from the terminal and solenoid, as estimated above (neglecting their interaction), and to the environment. Approximating the NST as a short during a burst, the erected Marx inductance for Fig. 2(a) is roughly 7.4 mH and for Fig. 2(b) without the solenoid is roughly 90 mH.

Estimating time-dependent circuit parameters
--------------------------------------------

During operation, the apparatus behaves approximately like a damped, undriven RLC circuit with time-dependent parameters. This is because during a burst the spark gaps act approximately as short circuits, making the circuit in Fig. 2 resemble that of Fig. 6. The circuit parameters and their time dependence can be estimated from “variable RLC fits” to the data in the following manner.

![Lumped series 