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VIGs are used in military technology, e.g. some [[directed-energy weapon]]s, as a secondary stage of another pulsed power source, commonly an [[explosive-driven ferroelectric generator]].
A spiral VIG consists of four alternating conductor-insulator-conductor-insulator sheets, wound into a cylinder, forming a [[capacitor]] also acting as a single-ended [[transmission line]], connected to a [[spark gap]] switch. The capacitor is charged from a power source, e.g. the EDFEG, then the spark gap fires after its [[breakdown voltage]] is reached. The [[electromagnetic wave]] created by the spark discharge travels along the transmission line, converting [[electrostatic field]] to [[electromagnetic field]], then after reflecting from the open end converts back to electrostatic field. A pulse of output amplitude 2nU (where n is the number of turns of the capacitor and U is the initial voltage it was charged to) and a rise time equal to twice the [[electrical length (transmission medium)|electrical length]] of the transmission line.[http://scholarsmine.mst.edu/post_prints/pdf/physics_09007dcc80588630.pdf][http://www.boliven.com/patent/US7151330/drawings][http://shadaly.com/vector_inversion_generator_4507567.html] The device acts as a distributed [[pulse forming network]].
[[Ferrite (magnet)|Ferrite]]s can be attached to the VIG construction to modify its characteristics.[http://www.findthatpatent.com/Apparatus_and_method_for_generating_high_voltages_using_a_voltage,7151330.html]
VIGs are advantageous due to their simplicity and the very short pulse [[rise time]]s in range of nanoseconds. Some VIGs can be configured as part of a [[tuned circuit]], acting as [[oscillator]]s with practical upper limit of about 700 MHz, generating energy that can be radiated from a suitable [[antenna]], allowing construction of very simple explosion-generated [[electromagnetic pulse]] generators.[http://www.armysbir.com/Technologies/View.aspx?pk=45430111-708f-463e-8fe1-cf1392a6bf99][http://www.devileye.net/catalog/rope_fastener/spiral_line_oscillator.html]
The use of VIGs includes [[directed-energy weapon]]s, [[x-ray]] pulse power supplies, [[plasma]] generators,
VIGs can be constructed by high-voltage hobbyists.[http://4hv.org/e107_plugins/forum/forum_viewtopic.php?43795.last]▼
▲VIGs can be constructed by high-voltage hobbyists.[http://4hv.org/e107_plugins/forum/forum_viewtopic.php?43795.last][http://www.sciencemadness.org/talk/viewthread.php?action=printable&fid=6&tid=6032]
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