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Microwave Corona Breakdown in Strongly Inhomogeneous Fields

Joel Rasch (Institutionen för radio- och rymdvetenskap, Icke-linjär elektrodynamik) ; Dan Anderson (Institutionen för radio- och rymdvetenskap, Icke-linjär elektrodynamik) ; Mietek Lisak (Institutionen för radio- och rymdvetenskap, Icke-linjär elektrodynamik) ; V.E. Semenov ; J. Puech
36th European Physical Society Conference on Plasma Physics 2009, EPS 2009; Sofia; Bulgaria; 29 June 2009 through 3 July 2009 Vol. 33E (2009), p. 657-660.
[Konferensbidrag, refereegranskat]

We investigate the main physical properties of microwave corona breakdown in strongly inhomogeneous electric fields. The focus is put on numerical and approximate analytical calculations of the breakdown threshold in an exponential ionization profile, which is the basic form of the ionization profile caused by the field enhancement around irregular and curved conducting objects. The breakdown threshold is a value associated with a certain plasma density profile. We explain the major characteristics of the density profile, its dependance on pressure and the interplay of diffusion and attachment. For lower pressures the diffusion distributes the electrons from regions of high ionization frequency to regions of weak ionization, where the attachment acts as a sink. For high pressures the diffusion becomes negligible and the breakdown threshold is set by the equality of the ionization and attachment frequencies in the high field region.



Denna post skapades 2009-11-25. Senast ändrad 2016-05-17.
CPL Pubid: 102169

 

Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Icke-linjär elektrodynamik (2005-2010)

Ämnesområden

Fusion, plasma och rymdfysik

Chalmers infrastruktur