Using numerical simulations to extract parameters of toroidal electron plasmas from experimental data
- Department of Physics, Lawrence University, Appleton, Wisconsin 54912 (United States)
- Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus (Denmark)
Measurements of the image charge induced on electrodes provide the primary means of diagnosing plasmas in the Lawrence Non-neutral Torus II (LNT II) [Phys. Rev. Lett. 100, 155001 (2008)]. Therefore, it is necessary to develop techniques that determine characteristics of the electron plasma from features of the induced image charge signal. This paper presents a numerical study which finds that the frequency of the image charge signal due to the toroidal version of the m=1 diocotron mode is proportional to the total trapped charge and inversely proportional to magnetic field strength, as in the cylindrical case. In the toroidal case, additional information about the m=1 motion of the plasma can be obtained by analysis of the image charge signal amplitude and shape. Finally, results from the numerical simulations are compared to experimental data from the LNT II and plasma characteristics are reported.
- OSTI ID:
- 21274165
- Journal Information:
- Physics of Plasmas, Vol. 16, Issue 3; Other Information: DOI: 10.1063/1.3091924; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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