Title:
Electrodynamic simulations of a photoconductively switched high voltage spark gap
Author(s):
J Hendriks, S B van der Geer and G J H Brussaard
Source:
J. Phys. D: Appl. Phys.
Vol./Issue/Date:
Volume 38, Issue 16
Year:
2005
Page(s):
2798–2803
Keywords:
Abstract:
We present a full three-dimensional electrodynamic model to simulate a
photoconductively switched high voltage spark gap. This model describes
the electromagnetic field-propagation in a coaxial spark gap set-up, which
determines the rise time of the switched pulse and reveals the influence of
discontinuities, such as view ports, on the pulse shape and the rise time.
Existing inductive lumped element and transmission line models, used to
model laser-triggered spark gaps, are compared with our electrodynamic
model. The rise time of the switched pulses in the different models does not
differ significantly. In the electrodynamic simulation, a curvature of the
electric field wave front is visible, resulting from the presence of non-TEM
modes near the gap. Furthermore, oscillations on the output signal are
revealed. These oscillations are caused by internal reflections on the inner
and outer conductors. Our electrodynamic model is able to visualize the rise
time evolution by monitoring the electric field-propagation in the gap region.
The presence of view ports in the set-up increases the rise time at the output
significantly and induces, owing to internal reflections, extra oscillations in
the signal.
Document:
Reference Id:
41
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