Electrothermal accelerators: the power conditioning point of view

Ingram, Mike; Weldon, W.F.

doi:10.1109/20.22524

Cited by 14 publications

(3 citation statements)

References 3 publications

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“…Electrothermal capillary plasma discharges have been studied for various applications in launch technology from pure electrothermal mass accelerators (ETA) to hybrid electrothermalelectromagnetic launchers (ET-EM) and electrothermal-chemical (ETC) guns [1][2][3][4][5][6][7]. Electrothermal capillary plasma sources in the ETC guns were utilized as an igniter to the bulk-loaded propellant and as an augmentation mechanism to the burn rates of solid propellant [8]- [11].…”

Section: Introductionmentioning

confidence: 99%

Electrothermal tapered capillary hyper jet focused-injection plasma source concept

Winfrey

Mittal

2014

2014 17th International Symposium on Electromagnetic Launch Technology

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Tapered capillaries operating in the confined controlled arc regime have the advantage of producing focused hyper plasma jets useful for ignition of electrothermal-chemical ETC systems, at peak kinetic temperatures in the range of 14,000-21,000K (~1.2-1.8eV) and considerable jet pressures of 10-70MPa for input discharge current of 20-30kA over a short pulse length 100-150µs. A tapered geometry made of Lexan polycarbonate with 16.8mm inlet and 8.8mm outlet radii produces a plasma jet with a plasma temperature of 14,253K (1.23eV) at a peak bulk velocity of 4.027km/s with a 10.38MPa exit pressure, and a total ablated mass of 10.56mg. Reducing the tapering to 12.6mm inlet and 6.6mm outlet radii produces a plasma jet with 16,382K (1.411eV) at a bulk velocity of 4.34 km/s with 23.27mg ablated mass. Further reduction in the tapering to 8.4mm inlet and 4.4mm outlet radii produces a plasma jet with 20,954K (1.8eV) at a bulk velocity of 4.89km/s with 70.78MPa exit pressure, and total ablated mass of 15.09mg. The preliminary study shows that the narrow tapering angle produces higher pressure, temperature, velocity and more ablated mass. Radiant heat flux at the taper exit varies from 2.2GW/m 2 at the wider tapers to 6.24GW/m 2 for the narrower taper.

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Section: Introductionmentioning

confidence: 99%

Electrothermal tapered capillary hyper jet focused-injection plasma source concept

Winfrey

Mittal

2014

2014 17th International Symposium on Electromagnetic Launch Technology

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“…Compulsators are prime candidates for use in EML [1], in that they perform various functions of kinetic energy storage, electromechanical energy conversion, power conditioning, and repeatability in one unit [2]. Compulsators were invented and developed for military applications such as future systems for advanced armor penetration, representing the most advanced and promising pulsed power supplies for electromagnetic hypervelocity launchers of railgun or coilgun types.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of a Self-Excited All-Air-Core and Fabrication of a Separate-Excited All-Iron-Core Passive Compulsator

Cui¹,

Wu²,

Cheng³

2008

2008 14th Symposium on Electromagnetic Launch Technology

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This paper presents a detailed description of design and simulation of a self-excited All-Air-Core and fabrication of a separate-excited All-Iron-Core compensated pulsed alternators (compulsator), also including the similarity and difference in configuration and principle of two prototypes. Presented are fabrication techniques, assembly processes and design methods developed specifically for pulsed power generators, including the carbon fiber rein-forced epoxy resin composite material usage of stator and rotor core in All-Air-Core compulsator, and the armature and field winding fabrication techniques and conglutination processes in All-Iron-Core compulsator. The armature winding is wound concentric winding by flat copper bars, the end-turn superposition problem solved by heating the flat copper bar to soften them for taking shape. Designs of a lightweight self-excited All-Air-Core rotating-field passive compulsator and a separate-excited All-Iron-Core compulsator for comparison have been completed. They all have rotating-field, two-phase, four-pole, and slotless armature winding and passive compensation .The heart of the self-excited All-Air-Core passive compulsator is carbon fiber rein-forced epoxy resin composite rotor which rotates at 10000rpm or more, and that epoxy composite resin stator reduces the saturation of the compulsator, which consequently reduces transient inductance of armature winding and increasing the magnitude of pulsed current. The usage of composite material also reduces the mass of the All-Air-Core compulsator and increases the velocity of the rotor and inertial energy storage, therefore increasing the energy density and power density. Another feature of the All-Air-Core PCPA is the use of two armature windings on the stator, which allows optimization of each armature winding to its specific duty cycle. Control of self-excited process is presented as well as the synchronous control of solid-state switch in excitation circuit and discharge main circuit by the special controller. The paper presents the simulation of magnetic field at no-load and discharge instance respectively. The paper analyzes the impact of the thickness of compensation shield to the performance of compulsator. Finally, the experiment schematic of All-Air-Core compulsator system is presented.

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“…E LECTROTHERMAL (ET) capillary plasma discharges have been studied for various applications in launch technology from pure electrothermal mass accelerators to hybrid ET-electromagnetic launchers and ET-chemical (ETC) guns [1]- [7]. ET capillary plasma sources in the ETC guns were utilized as an igniter to the bulk-loaded propellant and as an augmentation mechanism to the burn rates of solid propellant [8]- [11].…”

Section: Introductionmentioning

confidence: 99%

Hyper Jet Focused-Injection Tapered Capillary Plasma Source Concept

Winfrey

Mittal

Al-Halim

2015

IEEE Trans. Plasma Sci.

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The concept of tapered capillary is introduced as a method of injecting focused plasma jet into the breach of bulk-loaded electrothermal-chemical (ETC) launcher. Tapered capillaries will operate in the confined controlled arc regime, and they can provide the advantage of producing focused hyper plasma jets useful for ignition of ETC systems at controlled plasma temperatures and pressures. The concept is also useful for focused implantation of plasma ions on substrates with desired patterns. Such tapered capillaries can inject plasmas at peak kinetic temperatures in the range of 14 000-21 000 K (∼1.2-1.8 eV) and considerable jet pressures of 10-70 MPa for an input discharge current of 20-30 kA over a short pulselength of 100-150 µs. A tapered geometry made of Lexan polycarbonate with 16.8-mm inlet and 8.8-mm outlet radii produces a plasma jet with a plasma temperature of 14 253 K (1.23 eV) at a peak bulk velocity of 4.027 km/s with a 10.38-MPa exit pressure, and a total ablated mass of 10.56 mg. Reducing the tapering to 12.6-mm inlet and 6.6-mm outlet radii produces a plasma jet with a plasma temperature of 16 382-K (1.411 eV) at a bulk velocity of 4.34 km/s and a total of 23.27-mg ablated mass. Further reduction in the tapering to 8.4-mm inlet and 4.4-mm outlet radii produces a plasma jet with a plasma temperature of 20 954 K (1.8 eV) at a bulk velocity of 4.89 km/s with a 70.78-MPa exit pressure, and a total ablated mass of 15.09 mg. The preliminary study shows that the narrow tapering angle produces higher pressure, temperature, velocity, and more ablated mass. Radiant heat flux at the taper exit varies from 2.2 GW/m 2 for the wider tapers to 6.24 GW/m 2 for the narrower ones. Index Terms-Capillary discharge, electrothermal (ET) plasma, tapered hyper jet sources.0093-3813 He has also been a collaborator with teams from the Egyptian Atomic Energy Authority since 1998, collaborating on plasma applications. His current research interests include electrothermal launchers, plasma-matter interaction, plasma coaxial accelerators, plasma pinches, MHD, mathematical modeling, inertial electrostatic confinement, plasma glow discharge, plasma deposition, and surface modification of polymers.

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Electrothermal accelerators: the power conditioning point of view

Cited by 14 publications

References 3 publications

Electrothermal tapered capillary hyper jet focused-injection plasma source concept

Electrothermal tapered capillary hyper jet focused-injection plasma source concept

Design and Simulation of a Self-Excited All-Air-Core and Fabrication of a Separate-Excited All-Iron-Core Passive Compulsator

Hyper Jet Focused-Injection Tapered Capillary Plasma Source Concept

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