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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. an [[Explosive-driven ferroelectric generator|EDFEG]], then the spark gap fires after its [[breakdown voltage]] is reached. The [[electromagnetic wave]] created by the [[electric 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.<ref>{{Cite web |url=http://scholarsmine.mst.edu/post_prints/pdf/physics_09007dcc80588630.pdf |title=Archived copy |access-date=2010-01-16 |archive-date=2010-06-29 |archive-url=https://web.archive.org/web/20100629162736/http://scholarsmine.mst.edu/post_prints/pdf/physics_09007dcc80588630.pdf |url-status=dead }}</ref><ref>http://www.boliven.com/patent/US7151330/drawings</ref><ref>http://shadaly.com/vector_inversion_generator_4507567.html {{Dead link|date=March 2022}}</ref> The device acts as a distributed [[pulse forming network]].
[[Ferrite (magnet)|Ferrite]]s can be attached to the VIG construction to modify its characteristics, typically lowering the resonant frequency and increasing the efficiency.<ref>{{Cite web|url=http://www.findthatpatent.com/Apparatus_and_method_for_generating_high_voltages_using_a_voltage,7151330.html|title=findthatpatent.com - findthatpatent Resources and Information.|website=www.findthatpatent.com}}</ref>
==Applications==
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The use of VIGs includes [[directed-energy weapon]]s, [[x-ray]] pulse power supplies, [[plasma (physics)|plasma]] generators, etc.
VIGs are simple enough to be constructed by high-voltage hobbyists.<ref>
==References==
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