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Fusion Science and Technology
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Nicholas Tsoulfanidis—ANS member since 1969
As an undergraduate I studied physics at the University of Athens. I entered the university in 1955 after successfully passing a national exam (came up fourth in a field of about 700 candidates). Upon graduation and finishing my mandatory two-year military service, the plan was to teach physics either in a public high school or as a tutor for a private for-profit institution, preparing high school students for the national exam.
A. A. Kabantsev, C. F. Driscoll (18R13)
Fusion Science and Technology | Volume 51 | Number 2 | February 2007 | Pages 96-99
Technical Paper | Open Magnetic Systems for Plasma Confinement | doi.org/10.13182/FST07-A1324
Articles are hosted by Taylor and Francis Online.
We study ion-induced instability of flute-like (kz [approximately equal to] 0) diocotron modes in pure electron plasmas confined in a cylindrical Penning-Malmberg trap. In the absence of positive ion contamination, the low m diocotron modes are either neutrally stable (for m = 1) or weakly damped (for m = 2,3...) by Landau resonance on electrons corotating with the diocotron waves. By adding a small fraction (<1%) of positive ions into a double-well confinement configuration, we observe exponential instability of low m diocotron modes. The growth rates m are directly proportional to the overall ion fraction, Ni/Ne, and proportional to an effective charge separation of electrons and ions in the periodic wave perturbation.