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Relation of electron scattering cross-sections to drift measurement in noble gases

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dc.contributor.advisor Ulrich J. Becker. en_US Stacey, Blake (Blake C.) en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Physics. en_US 2006-05-15T20:38:14Z 2006-05-15T20:38:14Z 2005 en_US 2005 en_US
dc.description Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2005. en_US
dc.description Includes bibliographical references (leaves 59-62). en_US
dc.description.abstract We investigate the classic "inverse problem" of extracting collision and scattering cross sections from measurements of electron swarm behavior. A Monte Carlo technique for simulating electron motion through a gas of isotropic scatterers is presented, providing a simplified version of Biagi's MAGBOLTZ algorithm. Using this Monte Carlo software, we examine the thermalization of electron swarms, focusing on their drift velocity and informational entropy, providing justification for a set of analytic expressions for drift measurements which are valid in the hydrodynamic regime. These expressions are then used to estimate the ⁴He scattering cross section, first by a simple grid interpolation and then through a genetic algorithm (GA). This technique demonstrates that the 4He momentum-transfer cross section in the 0-7 eV range is approximately 6.5 [Angstrom]², with a peak near 2 eV, in agreement with literature values. Empirical cross sections are also presented for Xe and He:CH₄(90:10). en_US
dc.description.statementofresponsibility by Blake Stacey. en_US
dc.format.extent 62 leaves en_US
dc.format.extent 2397103 bytes
dc.format.extent 2398818 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.subject Physics. en_US
dc.title Relation of electron scattering cross-sections to drift measurement in noble gases en_US
dc.type Thesis en_US S.B. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Physics. en_US
dc.identifier.oclc 62623507 en_US

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