TY - GEN
T1 - Window flashover initiation under pulsed microwave excitation
AU - Krile, J.
AU - Edmiston, G.
AU - Dickens, J.
AU - Krompholz, H.
AU - Neuber, A.
PY - 2008
Y1 - 2008
N2 - Surface flashover development at the output window of high power microwave (HPM) systems presents a major limitation to the power densities and pulse lengths transmitted through these interfaces. As a result, developing a physical model accurate in predicting surface flashover initiation is of prime interest. A Monte-Carlo type electron motion simulation has been developed to estimate the delay time from initial electron to flashover. Although this approach has shown reasonable agreement with experimental results, the process yielding the initial seed electron(s) was neglected in the model, primarily due to the lack of quantitative and qualitative information on seed electron production. For instance, computational efforts investigating seed electron production via collisional detachment from negative oxygen ions have shown that while effective at DC, the collisional detachment model cannot remain a likely contributor of electrons at high frequencies (gt; sim;5 GHz). The key parameters impacting high power microwave surface flashover will be discussed and presented along with continued investigation into the statistics of possible seed electron sources, including trace contaminates present in the gas or on the dielectric surface.
AB - Surface flashover development at the output window of high power microwave (HPM) systems presents a major limitation to the power densities and pulse lengths transmitted through these interfaces. As a result, developing a physical model accurate in predicting surface flashover initiation is of prime interest. A Monte-Carlo type electron motion simulation has been developed to estimate the delay time from initial electron to flashover. Although this approach has shown reasonable agreement with experimental results, the process yielding the initial seed electron(s) was neglected in the model, primarily due to the lack of quantitative and qualitative information on seed electron production. For instance, computational efforts investigating seed electron production via collisional detachment from negative oxygen ions have shown that while effective at DC, the collisional detachment model cannot remain a likely contributor of electrons at high frequencies (gt; sim;5 GHz). The key parameters impacting high power microwave surface flashover will be discussed and presented along with continued investigation into the statistics of possible seed electron sources, including trace contaminates present in the gas or on the dielectric surface.
UR - http://www.scopus.com/inward/record.url?scp=62949097257&partnerID=8YFLogxK
U2 - 10.1109/IPMC.2008.4743719
DO - 10.1109/IPMC.2008.4743719
M3 - Conference contribution
AN - SCOPUS:62949097257
SN - 9781424415359
T3 - Proceedings of the 2008 IEEE International Power Modulators and High Voltage Conference, PMHVC
SP - 560
EP - 563
BT - Proceedings of the 2008 IEEE International Power Modulators and High Voltage Conference, PMHVC
Y2 - 27 May 2008 through 31 May 2008
ER -