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Title:Study of the effects of roughness, ultraviolet radiation, multipactoring and magnetic field on vacuum breakdown
Author(s):Aghazarian, Maro
Advisor(s):Ruzic, David N.
Department / Program:Nuclear, Plasma, & Rad Engr
Discipline:Nuclear Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):vacuum breakdowns
Ion Cyclotron Range of Frequencies (ICRF) antennas
breakdown
macroroughness
high voltage breakdown
electrical breakdown
surface roughness
effects of UV on breakdown
vacuum breakdown
ICRF antenna breakdown
Abstract:Breakdowns in vaccuum and the factors a ffecting them have been studied for more than a hundred years, with applications ranging from high voltage isolation to space propulsion. In current thermonuclear fusion projects, one of the methods of heating the plasma is through ion cyclotron radiofrequency heating. ICRF antennas are used to this end, while the voltage and hence the power possible to deliver through these antennas is limited because of breakdowns. The focus of this research has been to study some of the factors suspected to a ffect these breakdowns, namely, the macroscopic surface roughness and ultraviolet radiation, with the ultimate purpose of raising the breakdown threshold of ICRF antennas in order to deliver more power to thermonuclear fusion plasmas. Macroscopic surface roughness did not signify any regular prediction of breakdown threshold in copper and aluminum electrodes subjected to DC voltage. Though the presence of ultraviolet radiation lowered the breakdown threshold on average, the difference in the mean values was smaller than the uncertainty in measurement, making the results inconclusive until further studies are performed.
Issue Date:2013-08-22
URI:http://hdl.handle.net/2142/45506
Rights Information:Copyright 2013 Maro Aghazarian
Date Available in IDEALS:2013-08-22
Date Deposited:2013-08


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