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Thermally excited fluctuations as a pure electron plasma temperature diagnostic

Shiga, N. and Anderegg, F. and Dubin, D. H. E. and Driscoll, C. F. and Gould, R. W. (2006) Thermally excited fluctuations as a pure electron plasma temperature diagnostic. Physics of Plasmas, 13 (2). Art. No. 022109. ISSN 1070-664X.

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Thermally excited charge fluctuations in pure electron plasma columns provide a diagnostic for the plasma temperature over a range of 0.05 < k(B)T < 10 eV. 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 lambda(D)/R-p < 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 lambda(D)/R-p > 0.2, so that Landau damping is dominant and well modeled by theory. The third method compares the total (frequency-integrated) number delta N of fluctuating image charges on the wall antenna to a simple thermodynamic calculation. This method works when lambda(D)/R-p > 0.2.

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Additional Information: ©2006 American Institute of Physics. Received 16 November 2005; accepted 18 January 2006; published online 16 February 2006. We thank Professor R. E. Pollock for his seminal contributions and Professor T. M. O’Neil and Dr. J. Danielson for many fruitful discussions. This work was supported by National Science Foundation Grant No. PHY-0354979.
Subject Keywords:plasma fluctuations; plasma temperature; plasma diagnostics; plasma instability; antennas in plasma; plasma thermodynamics
Issue or Number:2
Record Number:CaltechAUTHORS:SHIpop06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3934
Deposited By: Tony Diaz
Deposited On:19 Jul 2006
Last Modified:02 Oct 2019 23:08

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