Abstract
Thermally excited charge fluctuations in pure electron plasma columns provide a diagnostic for the plasma temperature over a range of 0.05<kBT<10eV. Three different nonperturbative methods have been developed to determine the plasma temperature. The first method fits the near-Lorentzian spectrum of thermal fluctuations near a single weakly damped mode. This method works well where the modes are weakly damped, i.e., when λD∕Rp<0.3. The second method utilizes the emission spectrum over a broad frequency range encompassing several modes and the nonresonant fluctuations between modes. This method works for long columns with λD∕Rp>0.2, so that Landau damping is dominant and well modeled by theory. The third method compares the total (frequency-integrated) number δN of fluctuating image charges on the wall antenna to a simple thermodynamic calculation. This method works when λD∕Rp>0.2.
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