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Multipactor effect
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==History== This phenomenon was first observed by the French physicist [[Camille Gutton]], in 1924, at [[Nancy, France|Nancy]]. Multipactor was identified and studied in 1934 by [[Philo Farnsworth]], the inventor of electronic television, who attempted to take advantage of it as an amplifier. More commonly nowadays, it has become an obstacle to be avoided for normal operation of [[particle accelerator]]s, [[vacuum]] [[electronics]], [[radar]]s, [[satellite communication]] devices, and so forth. The first application of computers to investigate multipacting is from the early 1970s<ref /name=Ben></ref> when it was discovered as a major SRF cavity performance limitation. A novel form of multipactor has been proposed,<ref>{{cite journal | last=Kishek | first=R. A. | last2=Lau | first2=Y. Y. | last3=Ang | first3=L. K. | last4=Valfells | first4=A. | last5=Gilgenbach | first5=R. M. | title=Multipactor discharge on metals and dielectrics: Historical review and recent theories | journal=Physics of Plasmas | publisher=AIP Publishing | volume=5 | issue=5 | year=1998 | issn=1070-664X | doi=10.1063/1.872883 | pages=2120β2126| hdl=2027.42/71019 | hdl-access=free }}</ref> and subsequently experimentally observed, in which charging of a [[dielectric]] surface considerably changes the dynamics of the multipactor discharge.
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