Simulations of Multipactor Breakdown Between Two Cylinders

Rasch, Joel,1982Chalmers tekniska högskola,Chalmers University of Technology (författare)

Simulations have been performed to determine the multipactor breakdown threshold in a microwave structure composed of two parallel cylinders, chosen to be an approximate model of an open helix microwave antenna system. The electromagnetic field between the cylinders is available in closed analytical form, and a Monte Carlo software has been developed to calculate the 2-D electron trajectories and to simulate the multipactor avalanche in this inhomogeneous electric field for different ratios of cylinder radius and distance of separation between the cylinders. The results are compared with those of a recently published analytical theory and show a qualitatively good agreement. In particular, it is confirmed that, for a given distance between cylinders, there exists a smallest cylinder radius below which no two-sided multipactor breakdown can occur. The basic physical explanation is a loss mechanism for secondary emitted electrons that is caused by the curvature of the cylinder surfaces together with the strong electric field at the surfaces. The results imply that the breakdown threshold in realistic open helix antennas is significantly higher than those predicted using extrapolations based on resonance theory and the classical two parallel plate model.

Semenov, V. E.Russian Academy of Sciences (författare)
Rakova, E.Russian Academy of Sciences (författare)
Anderson, Dan,1943Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elfda (författare)
Johansson, J. F.Ruag Space AB (författare)
Lisak, Mietek,1947Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elfml (författare)
Puech, J.Centre National d'Etudes Spatiales (CNES) (författare)
Chalmers tekniska högskolaRussian Academy of Sciences (creator_code:org_t)

Ingår i:IEEE Transactions on Plasma Science: Institute of Electrical and Electronics Engineers (IEEE)39:9, s. 1786-17940093-38131939-9375

Av författaren/redakt...: Rasch, Joel, 198 ...; Semenov, V. E.; Rakova, E.; Anderson, Dan, 1 ...; Johansson, J. F.; Lisak, Mietek, 1 ...; visa fler...; Puech, J.; visa färre...

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