SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "swepub ;pers:(Larsson Anders);lar1:(kth);conttype:(refereed);pers:(Hurtig Tomas);pers:(Novac Bucur M.)"

Sökning: swepub > Larsson Anders > Kungliga Tekniska Högskolan > Refereegranskat > Hurtig Tomas > Novac Bucur M.

  • Resultat 1-3 av 3
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Appelgren, Patrik, et al. (författare)
  • Modeling of a small helical magnetic flux compression generator
  • 2008
  • Ingår i: IEEE Transactions on Plasma Science. - 0093-3813. ; 36:5, s. 2662-2672
  • Tidskriftsartikel (refereegranskat)abstract
    •  In order to gain experience in explosive pulsed power and to provide experimental data as the basis for computer modeling, a small high-explosive-driven helical magnetic flux-compression generator (FCG) was designed at the Swedish Defence Research Agency. The generator, of which three have been built, has an overall length of 300 mm and a diameter of 70 mm. It could serve as the energy source in a pulse-forming network to generate high-power pulses for various loads. This paper presents a simulation model of this helical FCG. The model, which was implemented in Matlab-Simulink, uses analytical expressions for the generator inductance. The model of resistive losses takes into account the heating of the conductors and the diffusion of the magnetic field into the conductors. The simulation results are compared with experimental data from two experiments with identical generators but with different seed currents, influencing the resistive losses. The model is used to analyze the performance of the generator.
  •  
2.
  • Appelgren, Patrik, et al. (författare)
  • Small Helical Magnetic Flux-Compression Generators : Experiments and Analysis
  • 2008
  • Ingår i: IEEE Transactions on Plasma Science. - 0093-3813. ; 36:5, s. 2673-2683
  • Tidskriftsartikel (refereegranskat)abstract
    • In order to gain experience in explosive pulsed power and to provide experimental data for modeling, a small high-explosive-driven helical magnetic flux-compression generator (FCG) was designed at the Swedish Defence Research Agency (FOI). The generator, of which three have been built, has an overall length of 300 mm and a diameter of 70 mm. It could serve as the energy source in a pulse-forming network to generate high power pulses for various loads. This paper presents the design of, and tests with, this helical FCG. The generator had an initial inductance of 23 mu H and was operated into a load of 0.2 mu H. The generator is charged with 0.27 kg of high explosives (PBXN-5). Various types of diagnostics were used to monitor the operation of the generator, including current probes, optical fibers, and piezo gauges. With seed currents of 5.7 and 11.2 kA, final currents of 269 and 436 kA were obtained, corresponding to current amplification factors of 47 and 39. The peak of the current was reached about 30 mu s after the time of crowbar. The two generators showed only small losses in terms of 2 pi-clocking. Using signals from optical fibers, the deflection angle of the armature could be determined to be 10 degrees in good agreement with hydrodynamic simulations of the detonation process and the detonation velocity to be 8.7 km/s in agreement with tabulated value.
  •  
3.
  • Novac, Bucur M., et al. (författare)
  • A 10-GW pulsed power supply for HPM sources
  • 2006
  • Ingår i: IEEE TRANS PLASMA SCI. ; s. 1814-1821
  • Konferensbidrag (refereegranskat)abstract
    • A research activity involving the detailed consideration of novel high-voltage transformers for pulsed-power applications has recently begun at Loughborough University. Although the main goal is the demonstration of a compact and lightweight unit employing magnetic insulation under vacuum conditions, the initial stage of the work is directed toward the development of a conventional air-cored transformer as a main component in a compact power supply for high power microwave sources. In cooperation with the Swedish Defence Research Agency (FOI), the power supply has been tested with a microwave source of the vircator type. The power generator for the system uses a 70-kJ/25-kV capacitor bank and an exploding wire array to generate a 150-kV voltage pulse in the primary circuit of a transformer. A pressurized SF6 spark gap in the secondary circuit sharpens the high-voltage output so that pulses approaching 500 kV and with a rise time well below 100 ns are generated on a 20-Omega high-power resistors With the peak power in excess of 10 GW. Experimental results are presented from final testing of the system, where a reflex triode vircator replaces the 20-Omega resistor. Measurements of the microwave emission using free-field sensors are presented, and comments are made with the microwave emission from the same vircator when powered by a Marx generator at FOI.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-3 av 3
Typ av publikation
tidskriftsartikel (2)
konferensbidrag (1)
Typ av innehåll
Författare/redaktör
Appelgren, Patrik, (3)
Nyholm, Sten E. (3)
Brenning, Nils, (2)
visa fler...
Elfsberg, Mattias (2)
Bjarnholt, Gert (1)
Möller, Cecilia, (1)
Brown, John (1)
Istenic, Marko (1)
Luo, Jing (1)
Smith, Ivor R. (1)
Hubbard, Martin (1)
visa färre...
Lärosäte
Uppsala universitet (2)
Språk
Engelska (3)

År

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy