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Träfflista för sökning "WFRF:(Elfsberg Mattias) srt2:(2011)"

Sökning: WFRF:(Elfsberg Mattias) > (2011)

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1.
  • Elfsberg, Mattias, et al. (författare)
  • Experimental studies on a coaxial vircator, designed for operation in TE11 mode
  • 2011
  • Ingår i: Proc. of Pulse Power Conference (PPC 2011). ; , s. 811-814
  • Konferensbidrag (refereegranskat)abstract
    • Experiments on a coaxial vircator have been performed. A vircator is a narrow band high power microwave source without any external generated magnetic field [1]. A coaxial vircator is an advantageous design of a microwave radiation source for a compact HPM-system. With a limited size and outer diameter it is possible to use a larger emitting area compared to an axial design. A conventional coaxial vircator will generate the radiation in TM01 mode, due to its geometrical properties. For a compact HPM-system, radiation in TE11 mode is preferred when the radiated energy needs to be focused on a specific target. For operation in TE11 mode a sectioned emitter can be used rather than a circumcircular. The efficiency of the vircator can be greatly improved by optimizing the geometry of the vircator housing. The impedance of the pulsed power supply driving the vircator and the impedance of the vircator, depending on the A-K gap and amount of emitting material, is also important for maximizing the vircator efficiency. For the experiments reported on, the vircator was driven by a 500 kV/500 J compact Marx generator that can be operated repetitively at 10 Hz. For these experiments, the Marx generator was operating in single shot mode. During the experiments presented here, a couple of geometrical features were varied as well as the applied voltage. Their influence on the radiated field strength, dominating frequency and bandwidth are reported on and discussed.
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2.
  • Möller, Cecilia, et al. (författare)
  • Experimental study of a vircator with premodulated electron beam
  • 2011
  • Ingår i: Proc. of Pulse Power Conference (PPC 2011)”, Chicago,USA, June 2011.. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 815-818
  • Konferensbidrag (refereegranskat)abstract
    • An initial experimental study of a vircator where a feedback mechanism is used to premodulate the electron beam has been performed. The anode-cathode gap distance and the applied voltage were varied and their influence on the frequency content and field strength of the generated microwave pulse are investigated and compared with particle in cell simulations. The frequency content of the microwave radiation was in good agreement between experiments and simulations. The vircator was very narrow banded at 2 GHz.
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3.
  • Ochoterena, Raul, et al. (författare)
  • Electrical currents and breakdown voltages as a diagnostic tool for fires
  • 2011
  • Rapport (refereegranskat)abstract
    • Two types of electrical measurements have been investigated in order to perform diagnostics of the fire dynamics in the ISO 5660 cone calorimeter. The rationale of the study is to take advantage of the pilot ignition electrodes that are already in place and use these to collect additional information such as emission of pyrolysis gases and time to ignition. The first part of the project was a refinement of the method for measuring the so called ion current, which has already been investigated in a pilot study. It was found that thorough shielding and grounding gives an excellent signal to noise ratio. An expression for the correlation between measured current and conductivity was also developed and validated experimentally. The second part of the project consisted of measuring the breakdown voltage, that is the voltage when dielectric failure occurs. It was found that this method was more sensitive to the fire dynamics before ignition, such as pyrolysis, but that the response to ignition was more ambiguous for the breakdown voltage than for the ion current.
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  • Resultat 1-3 av 3
Typ av publikation
konferensbidrag (2)
rapport (1)
Typ av innehåll
refereegranskat (3)
Författare/redaktör
Elfsberg, Mattias (3)
Hurtig, Tomas (2)
Möller, Cecilia (2)
Försth, Michael (1)
Nyholm, Sten E. (1)
Ochoterena, Raul (1)
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Nyholm, Sten (1)
Bieth, F. (1)
Delmote, P. (1)
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Kungliga Tekniska Högskolan (2)
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