{"604934":{"#nid":"604934","#data":{"type":"event","title":"M.S. Thesis Defense - Parker Singletary","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETitle:\u003C\/strong\u003E Optical Characterization of High Speed Plasma\u0026#39;s Electromagnetic Properties\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee:\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Morris Cohen, ECE, Advisor\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Thomas Gaylord, ECE\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Sven Simon, EAS \u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Mitchell Walker, AE\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EVery Low Frequency (VLF, 3-30kHz) and Low Frequency (LF, 30-300kHz) radio\u0026nbsp; waves are useful due to their ability to travel around the world in the\u0026nbsp; Earth-Ionosphere waveguide and excellent skin depth penetration into\u0026nbsp; conductors. However, generation of these waves is limited due to the fact\u0026nbsp; that their wavelengths are hundreds of meters to kilometers long. A recently\u0026nbsp; proposed antenna concept known as VAIPER involves an antenna with\u0026nbsp; time-varying conductivity. The antenna\u0026#39;s properties need to be varied at\u0026nbsp; nanosecond timescales. This time-varying concept can be realized at low power\u0026nbsp;with COTS components, but high speed switches cannot handle high power. A\u0026nbsp; plasma is a conducting media with electrical properties that can be varied\u0026nbsp; rapidly while handling high current flow. Antennas made from plasma have been\u0026nbsp; constructed and tested in the past, but not with rapidly time-varying\u0026nbsp;conductivity in mind. To determine a plasma\u0026#39;s viability as an antenna, its\u0026nbsp;electromagnetic properties must be measured. Conventional plasma analysis\u0026nbsp;techniques do not resolve variations in plasma at the desired speeds. The\u0026nbsp; objective of the research in this thesis is to develop techniques to analyze a plasma column\u0026#39;s electric properties as it is ionized and de-ionized on the\u0026nbsp;nanosecond timescales. Optical techniques are used to determine the\u0026nbsp;time-varying conductivity of rapidly pulsed plasma. The conductivity\u0026nbsp;measurements are used with a basic propagation model to determine whether the\u0026nbsp;experimental plasma columns can support the VAIPER scheme.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Optical Characterization of High Speed Plasma\u0027s Electromagnetic Properties"}],"uid":"28475","created_gmt":"2018-04-10 21:29:24","changed_gmt":"2018-04-10 21:30:01","author":"Daniela Staiculescu","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2018-04-16T16:00:00-04:00","event_time_end":"2018-04-16T18:00:00-04:00","event_time_end_last":"2018-04-16T18:00:00-04:00","gmt_time_start":"2018-04-16 20:00:00","gmt_time_end":"2018-04-16 22:00:00","gmt_time_end_last":"2018-04-16 22:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"434391","name":"ECE M.S. Thesis Defenses"}],"categories":[],"keywords":[{"id":"147891","name":"ms thesis defense"},{"id":"1808","name":"graduate students"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}