dc.contributor.advisor | Miklos Porkolab. | en_US |
dc.contributor.author | Tsujii, Naoto | en_US |
dc.contributor.other | Massachusetts Institute of Technology. Department of Physics. | en_US |
dc.date.accessioned | 2013-06-17T19:51:14Z | |
dc.date.available | 2013-06-17T19:51:14Z | |
dc.date.copyright | 2012 | en_US |
dc.date.issued | 2012 | en_US |
dc.identifier.uri | http://hdl.handle.net/1721.1/79259 | |
dc.description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2012. | en_US |
dc.description | Cataloged from PDF version of thesis. | en_US |
dc.description | Includes bibliographical references (p. 199-211). | en_US |
dc.description.abstract | Radio frequency (rf) waves in the ion cyclotron range of frequencies (ICRF) are widely used for heating fusion plasmas. In a multi-ion-species plasma, the launched fast waves convert to ion cyclotron waves and ion Bernstein waves in the vicinity of the two-ion hybrid resonance between the cyclotron resonances. The mode converted waves are of interest as actuators to optimize plasma performance through current drive and flow drive. Numerical simulations are essential to describe these processes accurately in a realistic tokamak geometry, and it is important that these simulation codes be validated against experiment. The phase contrast imaging (PCI) technique has been used on Alcator C-Mod to measure directly the rf waves. The measurements were compared to predictions of full-wave simulations using a synthetic diagnostic method. The measured mode converted wave intensity was found to be a factor of ~50 weaker than what was expected from the linear wave theory in a strong mode conversion regime. The agreement improved when the wave intensity was weaker, which is a possible indication of nonlinear wave physics being involved. | en_US |
dc.description.statementofresponsibility | by Naoto Tsujii. | en_US |
dc.format.extent | 211 p. | en_US |
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.rights.uri | http://dspace.mit.edu/handle/1721.1/7582 | en_US |
dc.subject | Physics. | en_US |
dc.title | Studies of ICRF mode conversion with phase contrast imaging and full-wave simulations in Alcator C-Mod | en_US |
dc.title.alternative | Studies of ion cyclotron range of frequencies mode conversion with phase contrast imaging and full-wave simulations in Alcator C-Mod | en_US |
dc.type | Thesis | en_US |
dc.description.degree | Ph.D. | en_US |
dc.contributor.department | Massachusetts Institute of Technology. Department of Physics | |
dc.identifier.oclc | 846589927 | en_US |