Explosive foil injection (EFI) pre-accelerator for electromagnetic launchers

Burden, R.A.; Gray, Jonathan; Oxley, Charles

doi:10.1109/20.22516

Cited by 6 publications

(1 citation statement)

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“…This shot attempted to use a modified form of the Exploding Foil Injector (EFI) system which is normally used on HTF [4]. The normal EFI cartridge uses a deformable aluminium plate to contain the foil explosion and produces a pellet injection velocity of approximately 50 m/s.…”

Section: Shot 27mentioning

confidence: 99%

Further investigations of plasma armature performance in the Culham Laboratory HTF rail launcher

et al. 1993

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Abslracl-This paper presents the results from an experimental investigation of plasma armature behaviour in the Culham Laboratory HTF rail launcher. The object of this work was to gain further insight into the conditions which lead OBJECTIVESThe main objectives of this work were: --to the formation of secondary plasma arcs in the rail launcher. The railgun was operated with a 1 cm square bore formed . from glass reinforced epoxy insulators and either stainless steel or copper rails. A 1 MJ, 8 kV capacitor bank was used as the power supply; this was arranged in five 200 kJ modules. The modules were sequentially fired, to produce a current waveform approximating to a linear ramp in the railgun. B-dot probes were used to measure the behaviour of the plasma armatures in the launcher. A number of calibration checks were performed to assess the quality of the B-dot probe measurements, with regard to both spatial resolution and rail current measurement. Experimental results were obtained with projectile muzzle velocities ranging from 1.5 km/s to 3.0 kmls; two free arc shots also occurred during the test series. The results show that the launcher performed much better with copper rails than with stainless steel rails. The results also show that the glass epoxy insulators performed much better than the acetyl copolymer material previously used in HTF.

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Section: Shot 27mentioning

confidence: 99%

Further investigations of plasma armature performance in the Culham Laboratory HTF rail launcher

et al. 1993

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Сивков

2001

Journal of Applied Mechanics and Technical Physics

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Streak spectroscopy and velocimetry of electrically exploded Ni/Al laminates

Morris

Wilkins

May

2013

Journal of Applied Physics

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We present an experimental and theoretical study of electrically exploded nickel-aluminum (Ni/Al) laminates, lithographically patterned into bow-tie bridge regions, and encapsulated with parylene. The exothermic nature of Ni/Al reactions is well-known at typical self-heating rates of 103–106 K/s, but electrical heating allows the interrogation of phenomena at heating rates which are five to six orders of magnitude higher. The use of time-resolved streak camera emission spectroscopy revealed that Ni/Al laminates heated at these higher rates exhibited brighter emission during the first 150 ns of emission than samples composed of either Al or Ni alone, suggesting an exothermic effect which rapidly started and persisted for at least this length of time. We also measured the transduction of electrical energy into kinetic energy through velocity measurements of encapsulation layers ejected from the bridge region. An empirical model using experimental power curves and one empirical fitting parameter successfully predicted these velocities. This model agreed well with experiments from different Al and Ni samples using the same fitting parameter, but an apparent 1.2 J/mg of additional energy from the mixing of Ni and Al was necessary to accurately predict velocities from Ni/Al laminate samples. This energy quantity corresponded to a reference value for the enthalpy of mixing Ni and Al, and likely contributed to both brighter emission and higher than expected velocities observed.

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Explosive foil injection (EFI) pre-accelerator for electromagnetic launchers

Cited by 6 publications

References 1 publication

Further investigations of plasma armature performance in the Culham Laboratory HTF rail launcher

Further investigations of plasma armature performance in the Culham Laboratory HTF rail launcher

Untitled

Streak spectroscopy and velocimetry of electrically exploded Ni/Al laminates

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