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1.
  • Elfsberg, Mattias, et al. (författare)
  • Experimental Studies of Anode and Cathode Materials in a Repetitive Driven Axial Vircator
  • 2008
  • Ingår i: IEEE Transactions on Plasma Science. - 0093-3813. ; 36, s. 688-693
  • Tidskriftsartikel (refereegranskat)abstract
    •  Repetitive use of a high-power microwave (HPM) radiation source implies strong erosion on cathode and anode materials. Electrode material endurance has been studied in a series of experiments with an axial vircator powered by a compact Marx generator. The Marx generator operated in a 10 Hz repetitive mode with a burst of ten pulses. Velvet and graphite was used as electron-emitting materials, and they showed markedly different pulse characteristics. Three different anode materials were used; stainless steel mesh, stainless steel wires and molybdenum wires, which all had different influence on the pulse characteristics.
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2.
  • Möller, Cecilia, et al. (författare)
  • Experimental Studies of the Influence of a Resonance Cavity in an Axial Vircator
  • 2010
  • Ingår i: IEEE Transactions on Plasma Science. - 0093-3813. ; 38:6, s. 1318-1324
  • Tidskriftsartikel (refereegranskat)abstract
    • Experiments on an axial virtual-cathode oscillator (vircator) with a resonance cavity enclosing the virtual cathode are reported. The vircator is driven by a repetitive Marx generator operating in a single-shot mode. To be able to separate different radiation mechanisms, the design of the vircator allows adjustment of the cavity depth as well as the way microwave radiation is extracted. The microwave radiation is measured with a pair of free-field B-dot sensors. The maximum field strengths were registered when the bandwidth was very narrow.
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3.
  • Möller, Cecilia, et al. (författare)
  • Numerical Simulation of the TE11 Mode in a Coaxial Vircator
  • 2007
  • Ingår i: IEEJ Transactions on Fundamentals and Materials. ; 127:11, s. 687-689
  • Tidskriftsartikel (refereegranskat)abstract
    • Studies of the concept of direct excitation of the TE11 mode in a coaxial vircator using three-dimensional particle-in-cell simulations is presented. The excitation of the TE11 mode is made possible by sectioning the emitting surface of the cathode, thus creating two interacting virtual cathodes. It is shown that the two virtual cathodes formed oscillate in push-pull mode as previously has been described for a planar geometry.  
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4.
  • Möller, Cecilia, et al. (författare)
  • Proof of Principle Experiments on Direct Generation of the TE11 Mode in a Coaxial Vircator
  • 2010
  • Ingår i: IEEE Transactions on Plasma Science. - 0093-3813. ; 38:1, s. 26-31
  • Tidskriftsartikel (refereegranskat)abstract
    • Experiments on a coaxial vircator with a sectioned emitter are reported. The emitting area is sectioned to form two opposing emitters in order to favor growth of the TE11 mode and inhibit growth of the TM01 mode that is usually excited in a coaxial vircator. Experiments are performed using a compact 320-J 400-kV Marx generator and a compact coaxial vircator built in a standard 8 '' vacuum tube. The radiated magnetic-field strength is measured by means of four free-field (B-dot) probes, and experiments show that sectioning the emitter does, in fact, lead to generation of the TE11 mode.
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  • Resultat 1-5 av 5
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Hurtig, Tomas (4)
Elfsberg, Mattias (4)
Nyholm, Sten E. (3)
Nyholm, Sten, (2)
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Akyuz, Mose (1)
Appelgren, Patrik, (1)
Moller, Cecilia (1)
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Kungliga Tekniska Högskolan (4)
Uppsala universitet (2)
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