Then, using a simple circuit analysis, the current sheet was modeled as a damped sine wave based on the experimentally determined thruster impedance, for use in the MACH2 computer simulation. Dynamic Z-pinches for high-gradient, high-current acceleration V. Monday, October 29, 2: Modeling of ablation-fed pulsed plasma thrusters. Link to citation list in Scopus. Monday, October 29, 3: The first neutron peak occurred during the stagnation.
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Abstract Design of the proper power system for an improved ablation-fed pulsed plasma microthruster PPT requires the ability to specify amplitudes, risetimes, waveforms and pulsetimes in relation to propellant properties and thrust chamber dimensions. In particular, the thin approach leads to large velocity gradients at implosion not found with the non-local model.
The obtained pulse shape enables us to simulate a cylindrically convergent ramp wave, which quasi-isentropically compresses the Deuterium fill to densities much higher than achievable by using a standard pulse.
In this work we study the power and yield from a Kr gas puff on the refurbished Z generator using the MACH2-TCRE simulation code in R-Z coupled to four different models for the radiation transport of bound-bound transitions within the probability-of-escape formalism: Then, using a simple circuit analysis, the current sheet was modeled as a damped sine wave based on the experimentally determined thruster impedance, for use in the MACH2 computer simulation.
Files over 3MB may be slow to open. The timing of the shocks and their trajectories provide information on the shock launching mechanisms. We present a study investigating the initiation of plasma in solid, metallic liners where the liner thickness is large compared to the collisionless skin depth.
APS th Annual Meeting of the APS Division of Plasma Physics – Session Index DPP12
Understanding the mechanisms behind these high gradients is essential for optimizing the device for unique compact accelerator applications. In experiments with FF-1, a mega-amp PF facility, we have found that going beyond this plateau requires elimination or extreme minimization of erosion of pu,sing into the plasma sheath. Comparisons of numerical results with data from the LES 6 PPT are encouraging, even with present, idealized models for Teflon plasma properties.
Therefore, isentropic liner implosions are a promising technique for recreating the conditions present in the interiors of gas giants. Most pulsinh the neutrons were emitted during the second neutron pulse after the plsing of instabilities. We have addressed these various obstacles in a set of experiments and report on results. B-Dot probes; a laser interferometer; and Rogowski coils. Sequences of time-resolved filtered pinhole images of the plasma column show a symmetric compression leading to Link to citation list in Scopus.
Modeling of ablation-fed pulsed plasma thrusters
Measurements of modulation growth due to ablative Richtmyer-Meshkov instability using 2D laser-imprinted modulations David Martinez, V.
Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U. We demonstrate the generation of dense large-aspect-ratio plasmas columns with extremely high degree of ionization in micro-capillary channels heated by ultrafast discharge current pulses.
Fingerprint Pulsed plasma thrusters. By doing so, we keep the fuel at low temperature.
These data will be compared to magneto-hydrodynamic simulations. Plasmas 17, This paper concentrates on the effects of cylindrical geometry on the magneto-Rayleigh-Taylor instability MRTa major concern in the magnetized liner inertial fusion concept MagLIF . The RT instability growth rate in doped targets is reduced by a factor of 1. The experimental data show the hydrodynamic evolution of the target and MG-level magnetic fields generated in the broken foil. The mass ablated per shot then scales as the stored electrical energy, in agreement with experiments over a wide range of operations.
The system is diagnosed axially using interferometry, optical streak photography and optical spectroscopy. The results show that impurity doping strongly reduces the shell-density modulation and the instability growth rate. Magnetic field generation during the nonlinear phase of the Rayleigh–Taylor Pulisng instability in an pulwing driven plasma using ultrafast laser-driven proton radiography has been measured.
Pulse shaping was performed by solving Kidder’s homogeneous isentropic compression for cylindrical geometry and extending it to an arbitrary Equation of State. In 31st Joint Propulsion Conference and Exhibit.
Target modulations were seeded by laser nonuniformities and amplified during target acceleration by the RT instability. Turchi PJMikellides P.