Search Results - "LUGINSLAND, J. W"

Absolute Instability near the Band Edge of Traveling-Wave Amplifiers by Hung, D M H, Rittersdorf, I M, Zhang, P, Chernin, D, Lau, Y Y, Antonsen, T M, Luginsland, J W, Simon, D H, Gilgenbach, R M

“…Applying the Briggs-Bers "pole-pinch" criterion to the exact transcendental dispersion relation of a dielectric traveling wave tube (TWT), we find that there…”
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Two-dimensional space-charge-limited emission: beam-edge characteristics and applications by Umstattd, R J, Luginsland, J W

“…There is, at present, no analytic solution that extends Child-Langmuir space-charge-limited emission beyond 1D. Herein, we investigate the characteristics of…”
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Electron Cycloidal and Brillouin Flows in a Two-Dimensional Planar Crossed-Field Gap by Zhu, X., Luginsland, J. W., Browning, J., Garner, A. L.

“…In crossed-field devices, Brillouin flow is regarded as the prevalent equilibrium flow 1 . One-dimensional (1-D) theory and particle-in-cell (PIC) simulations…”
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A simple physical derivation of Child–Langmuir space-charge-limited emission using vacuum capacitance by Umstattd, R. J., Carr, C. G., Frenzen, C. L., Luginsland, J. W., Lau, Y. Y.

“…The fundamental Child–Langmuir limit on the maximum current density in a vacuum between two infinite parallel electrodes is one of the most well known and…”
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Three-dimensional particle-in-cell simulations of rapid start-up in strapped oven magnetrons due to variation in the insulating magnetic field by Luginsland, J. W., Lau, Y. Y., Neculaes, V. B., Gilgenbach, R. M., Jones, M. C., Frese, M. H., Watrous, J. J.

“…A three-dimensional parallel particle-in-cell code, ICEPIC, is used to simulate the geometry and the magnetic field profiles of the recent low-noise, fast…”
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Effect of Initial Conditions on Charged Particle Acceleration in a Dense Plasma Focus by Jackson, S. L., Engelbrecht, J. T., Beresnyak, A. R., Mamonau, A.A., Petkov, E. E., Richardson, A. S., Allen, R. J., Boyer, C. N., Giuliani, J. L., Schumer, J. W., Klir, D., Rezac, K., Cikhardt, J., Maron, Y., Stambulchik, E., Roark, Christine, Stoltz, Peter H., Spirkin, Anton, Luginsland, J. W.

“…Charged particle acceleration has been investigated in a dense plasma focus (DPF) driven by the Hawk pulsed-power generator at the Naval Research Laboratory…”
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Role of ions in a crossed-field diode by Lau, Y Y, Luginsland, J W, Cartwright, K L, Haworth, M D

“…The effect of ions in a magnetically insulated crossed-field gap is studied using a single particle orbit model, shear flow model, and particle-in-cell…”
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Modeling of the Hawk Dense Plasma Focus (DPF) Device Using USIM by Roark, Christine M., Stoltz, Peter H., Spirkin, Anton, Luginsland, J. W., Jackson, S. L., Giuliani, J. L., Engelbrecht, J. T., Rittersdorf, Ian M., Richardson, A. Stephen, Schumer, J. W.

“…We compare MHD simulation results to experimental measurements taken from a dense plasma focus driven by the HAWK pulsed-power generator (0.65 MA peak current,…”
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Initial Results from a Dense Plasma Focus Driven by a High-Inductance Generator by Jackson, S. L., Engelbrecht, J. T., Richardson, A. S., Bcrcsnyak, A., Weber, B. V., Giuliani, J. L., Rittersdorf, I. M., Schumer, J. W., Klir, D., Rezac, K., Cikhardt, J., Maron, Y., Stambulchik, E., Roark, Christine, Stoltz, Peter H., Spirkin, Anton, Luginsland, J. W.

“…The Naval Research Laboratory's Hawk pulsed power generator is being used to drive a dense plasma focus (DPF) in order to study the phenomenon of charged…”
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Two-Dimensional Child-Langmuir Law by Luginsland, JW, Lau, YY, Gilgenbach, RM

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Particle in Cell Finite Element Validation and Verification Methods by O'Connor, S., Luginsland, J. W., Shanker, B.

“…Particle in cell codes are used extensively to understand plasma physics and to design devices that exploit these physics. More recent needs (say novel table…”
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A virtual prototyping environment for directed-energy concepts by Peterkin, R.E., Luginsland, J.W.

“…Enhancements in computation hardware and the development of novel software have enabled virtual prototyping in several areas of science and engineering. In…”
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Klein tunnelling model of low energy electron field emission from single-layer graphene sheet by Sun, S., Ang, L. K., Shiffler, D., Luginsland, J. W.

“…By considering the effect of Klein tunneling for low energy electrons with linear energy dispersion, a model has been constructed to calculate the amount of…”
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Magnetic priming effects on noise, startup, and mode competition in magnetrons by Neculaes, V.B., Jones, M.C., Gilgenbach, R.M., Lau, Y.Y., Luginsland, J.W., Hoff, B.W., White, W.M., Jordan, N.M., Pengvanich, P., Hidaka, Y., Bosman, H.L.

“…Azimuthally varying axial magnetic fields have been utilized to perform "magnetic priming" of magnetrons for rapid startup, low noise, and mode control. An…”
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Magnetic perturbation effects on noise and startup in DC-operating oven magnetrons by Neculaes, V.B., Jones, M.C., Gilgenbach, R.M., Lau, Y.Y., Luginsland, J.W., Hoff, B.W., White, W.M., Jordan, N.M., Pengvanich, P., Hidaka, Y., Bosman, H.L.

“…Previous experiments demonstrated that imposing an azimuthally varying axial magnetic field, axially asymmetric, in dc-operating oven magnetrons causes rapid…”
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Improved electrostatic design for MILO cathodes by Haworth, M.D., Cartwright, K.L., Luginsland, J.W., Shiffler, D.A., Umstattd, R.J.

“…Recent experimental and computer simulation results on a magnetically insulated transmission line oscillator (MILO) have indicated that the large beam-current…”
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Improved cathode design for long-pulse MILO operation by Haworth, M.D., Luginsland, J.W., Lemke, R.W.

“…An improved cathode design for a magnetically insulated transmission line oscillator (MILO) has resulted in extending the radiated microwave pulse duration…”
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AC space charge effects on beam loading of a cavity by Kowalczyk, R., Yue Ying Lau, Antonsen, T.M., Luginsland, J.W., Chernin, D.P., Wilsen, C.B., Wilkin Tang, Gilgenbach, R.M.

“…A calculation of the loading of a resonant cavity by an electron beam is presented. This calculation is the first to include all effects of ac space-charge…”
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A simulation study of beam loading on a cavity by Wilsen, C.B., Luginsland, J.W., Yue Ying Lau, Antonsen, T.M., Chernin, D.P., Tchou, P.M., Keyser, M.W., Gilgenbach, R.M., Ludeking, L.D.

“…Beam loading exerts a strong influence on the operation of high-power and medium-power microwave sources. This paper reports a simulation study of beam loading…”
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Effects of a series resistor on electron emission from a field emitter by Luginsland, J. W., Valfells, A., Lau, Y. Y.

“…Universal curves are constructed that provide an immediate determination of the effect of a series resistor on the electron emission from a field emitter…”
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