Burrell, Keith Howard (1974) An investigation of the resonance cone structure in a warm anisotropic plasma. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-10252005-155445
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.
This work presents a detailed theoretical and experimental investigation of the resonance cone pattern excited by a small antenna in a warm, magnetized plasma.
The warm plasma theory is developed for an infinite, uniform plasma for arbitrary incident frequency [...] in the limit that [...] and [...]. Here, [...] and [...] are the electron plasma and cyclotron frequencies, respectively, while [...] is the Debye length, [...] is the Larmor radius, and [...] is the distance from the source to the point of observation. The theory predicts the functional dependence of the angular position of the main resonance cone peak and the angular spacing between interference peaks on the physical parameters. The theory for plasmas with nonuniform density is also developed, but in the cold plasma limit, leading to predictions that the resonance cones can reflect off of density gradients.
Experimental work verifying the theoretical picture is presented. The main cone angle is found to depend on [...], [...], [...], and [...] in a manner consistent with the theory, as is the angular interference spacing. The idea of resonance cones reflecting from density gradients can explain features of the data that are otherwise incomprehensible.
From the data, values for [...] are obtained in two independent ways, and the results are consistent. The data also yield a value for the temperature that is appropriate for the afterglow plasma used in the experiment. Since both density and temperature can be obtained from the same data, resonance cone measurements are a useful diagnostic for plasmas in which antennas can be inserted.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Physics, Mathematics and Astronomy|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||28 May 1974|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||25 Oct 2005|
|Last Modified:||26 Dec 2012 03:06|
- Final Version
See Usage Policy.
Repository Staff Only: item control page