Search Results - "Dialetis, D"

Accurate Representation of Attenuation in Helix TWT Simulation Codes by Dialetis, D., Chernin, D., Antonsen, T.M., Levush, B.

“…We report on the results of a study that compares an ad hoc model of circuit attenuation used in helix traveling-wave tube (TWT) simulation codes with the…”
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An Improved Representation of AC Space-Charge Fields in Steady-State Simulation Codes for Linear-Beam Tubes by Dialetis, D., Chernin, D., Antonsen, T.M., Levush, B.

“…Accurate evaluation of the ac space-charge electric field is required in order to obtain accurate predictions for linear-beam-tube performance using…”
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DIAS Project: The establishment of a European digital upper atmosphere server by Belehaki, A., Cander, Lj, Zolesi, B., Bremer, J., Juren, C., Stanislawska, I., Dialetis, D., Hatzopoulos, M.

“…The main objective of DIAS (European Digital Upper Atmosphere Server) project is to develop a pan-European digital data collection on the state of the upper…”
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Ultrafast simulations of multimode VCSEL using optimized waist paraxial eigenmodes by Riyopoulos, S., Dialetis, D.

“…An ultrafast two-dimensional (2-D) multimode vertical-cavity surface-emitting laser (VCSEL) simulation tool suite is introduced using eigenmode expansion of…”
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Theory and experiment of ultrahigh-gain gyrotron traveling wave amplifier by Kwo Ray Chu, Han-Ying Chen, Chien-Lung Hung, Tsun-Hsu Chang, Barnett, L.R., Shih-Hung Chen, Tz-Te Yang, Dialetis, D.J.

“…Physics and technology issues of importance to the high-gain gyrotron traveling wave amplifier (gyro-TWT) are investigated in theory and experiment. The…”
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Comparative analysis of the Curnow and Malykhin-Konnov-Komarov (MKK) circuits as representations of coupled-cavity slow-wave structures by Dialetis, D., Chernin, D.P., Cooke, S.J., Antonsen, T.M., Chia-Lie Chang, Levush, B.

“…Two lumped element models of coupled-cavity slow-wave structures, one due to Curnow (1965) and another due to Malykhin, Konnov, and Komarov (MKK) (2003), are…”
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Generic representation of active cavity VCSEL eigenmodes by optimized waist Gauss-Laguerre modes by Riyopoulos, S.A., Dialetis, D., Liu, J., Riely, B.

“…Gain-guided eigenmodes in open VCSEL cavities are constructed by superposition of paraxial (i.e., Gauss-Laguerre) (GL) modes, employing the effective cavity…”
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Effect of random secondary delay times and emission velocities in electron multipactors by Riyopoulos, S., Chernin, D., Dialetis, D.

“…Traditionally, the modeling of rf driven electron cascades (multipactors) has employed a constant emission velocity and zero delay time for all secondaries…”
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Periodic and non-periodic phenomena in a sunspot region by Tsiropoula, G., Alissandrakis, C. E., Dialetis, D., Mein, P.

“…We have studied running penumbral waves, the homogeneous Evershed effect, and the spatial relation between intensity and Doppler velocity penumbral features of…”
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EVOLUTION IN SPACE AND TIME OF SUPERPENUMBRAL CHROMOSPHERIC FIBRILS by Tsiropoula, G, Dialetis, D, Alissandrakis, C E, Mein, P, Mein, N

“…We have studied the spatial structure and temporal evolution of the intensity and Doppler velocity of dark fibrils forming the superpenumbra of an isolated…”
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Dynamic phenomena in the chromospheric layer of a sunspot by ALISSANDRAKIS, C. E, GEORGAKILAS, A. A, DIALETIS, D

“…We have studied running penumbral waves, umbral oscillations, umbral flashes and their interrelations from H alpha observations of a large isolated sunspot…”
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Realization of a Stable and Highly Efficient Gyrotron for Controlled Fusion Research by Carmel, Y., Chu, K. R., Read, M., Ganguly, A. K., Dialetis, D., Seeley, R., Levine, J. S., Granatstein, V. L.

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Generation of coherent x rays by a relativistic charged particle traveling through a crystal by Dialetis, D.

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High-harmonic slotted gyroklystron amplifier: linear theory and nonlinear simulation by McDermott, D.B., Chong, C.K., Luhmann, N.C., Chu, K.R., Dialetis, D.

“…A fluid theory and two self-consistent particle-tracing simulation codes are described for designing low voltage, s/sup th/-harmonic slotted gyroklystron…”
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The variation of the mean size of the photospheric granules close to and away from a sunspot by MACRIS, C, PROKAKIS, T, DIALETIS, D, MULLER, R

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Generation of coherent radiation in a resonant medium by a relativistic charged particle by Dialetis, D.

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Improved beam confinement in the modified betatron with strong focusing by Kapetanakos, CA, Len, LK, Smith, T, Golden, J, Smith, K, Marsh, SJ, Dialetis, D, Mathew, J, Loschialpo, P, Chang, JH

“…The lifetime of the circulating electron beam in the Naval Research Laboratory modified betatron has been increased by more than 2 orders of magnitude with the…”
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Beam extraction scheme from the modified betatron accelerator by Kapetanakos, CA, Marsh, SJ, Dialetis, D

“…A technique for the extraction of the electron ring from the modified betatron accelerator (MBA) is proposed. The extraction scheme is based on the…”
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Zenith photoelectric measurements during the annular solar eclipse of April 29, 1976 by Prokakis, Th, Dialetis, D.

“…Measurement of the light intensity in the zenith, obtained during the annular solar eclipse of April 29, 1976, are given in three wavelength bands (centered on…”
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A high power gyrotron operating in the TE 041 mode by Arfin, B., Kwo Ray Chu, Dialetis, D., Read, M.E.

“…A 35-GHz gyrotron operating in the TE(041) mode has been built and tested. Output powers of 320 kW at 40-percent efficiency have been obtained. These test…”
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