Thumbnail
Access Restriction
Open

Author Liu, Y. S. ♦ Zhang, X. W. ♦ Zhang, Z. Q. ♦ Shao, H. ♦ Wang, Y. ♦ Liu, W. Y. ♦ Ke, C. F. ♦ Chen, C. H. ♦ Liang, Y. Q. ♦ Wu, X. L. ♦ Guo, L. T. ♦ Chang, C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ BREAKDOWN ♦ CAPACITY ♦ CARBONIZATION ♦ CURRENTS ♦ DIELECTRIC MATERIALS ♦ ELECTRONS ♦ LAYERS ♦ MICROWAVE RADIATION ♦ PERIODICITY ♦ POLYSTYRENE ♦ PULSES ♦ RESONANCE ♦ SURFACE PROPERTIES ♦ TRANSMISSION
Abstract The surface breakdown of dielectric windows seriously limits the transmission of high power microwaves (HPM), and has blocked the development of microwave technology in recent decades. In this paper, X-band HPM experiments of window breakdown at the vacuum/dielectric interface and the atmosphere/dielectric interface at single and repetitive pulses were conducted. The cross-linked polystyrene (CLPS) dielectric window with a periodic surface profile can significantly improve the breakdown threshold at single and repetitive pulses. Furthermore, the flat surface layer of CLPS was discovered to be carbonized to a depth of several millimeters and filled with electrical trees at repetitive pulses. Theoretical models were built to understand the underlying physics behind the phenomena in experiments. With the analysis of the electron resonance process breaking the molecular bond and the temperature rise caused by the traversing current in the dielectric material, a microscopic explanation for the carbonization of the dielectric window was introduced.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-09-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 22
Issue Number 9


Open content in new tab

   Open content in new tab