Event
Ph.D. Dissertation Defense: Dmytro Kashyn
Wednesday, July 9, 2014
9:00 a.m.
Room 1207, IREAP
Maria Hoo
301 405 3681
mch@umd.edu
ANNOUNCEMENT: Ph.D. Dissertation Defense
Name: Dmytro Kashyn
Committee:
Professor Victor Granatstein, Chair;
Professor Thomas Antonsen
Dr. Gregory Nusinovich
Dr. John Rodgers
Professor Daniel Lathrop, Dean's Representative.
Professor Thomas Antonsen
Dr. Gregory Nusinovich
Dr. John Rodgers
Professor Daniel Lathrop, Dean's Representative.
Date/Time: Wednesday, July 9, 2014 at 9 am
Location: IREAP Large Conference Room ( Energy Research Building), Room 1207
Title: Contributions to resolving issues impeding the operation of high power microwave devices
Abstract:
This dissertation presents the results of activities related to experimental investigation of novel sub-terahertz gyrotron intended for practical realization of novel scheme for remote detection of concealed radiation. The experiments with this gyrotron have demonstrated generation of microwave radiation with record power and efficiency. Detailed investigation of the breakdown prone volume as well as the effect of the atmosphere on propagating electromagnetic radiation was carried out. Since achieving efficiency of the device that was in agreement with theoretical prediction was associated with significant experimental challenges related to the breakdown. The need of theoretical investigation of this process, that limits the performance of high power microwave devices had become apparent. A number of factors, including the role of the micro-particles and the role of micro-protrusions in the process of the breakdown development were analyzed both theoretically and numerically.
