Results 51 to 60 of about 842 (116)

Optimization of Microwave Generation by Coaxial Vircator

IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th IEEE International Conference (Cat. No.99CH36297), 2003
Summary form only given. The coaxial virtual cathode oscillator (vircator) developed by Texas Tech University was studied in order to improve the efficiency of microwave generation. The microwave frequency and mode were diagnosed. The results were used to design a microwave reflector that enhances the microwave fields in the vircator area.
W. Jiang, K. Woolverton, J. Dickens, M. Kristiansen   +3 more
openaire   +1 more source

Tunable vircators with e-beam premodulation

PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pulsed Power Conference. Digest of Papers (Cat. No.01CH37251), 2002
Summary form only given, as follows. Presents recent results of theoretical and experimental studies of HPM production in virtual cathode systems with electron beam premodulation. The phase separation of electron current in these devices is due to strong energy dependence of electron current passage just above the critical current level and develops at
S.D. Korovin, S.A. Kitsanov, A.I. Klimov, I.K. Kurkan, I.V. Pegel, S.D. Polevin, V.V. Rostov, V.P. Tarakanov   +7 more
openaire   +1 more source

Coaxial vircator source development

IEEE Conference Record - Abstracts. 1996 IEEE International Conference on Plasma Science, 1996
Summary form only given. A study of efficiency improvement for a coaxial virtual cathode oscillator is described. The coaxial geometry has many physical parameters that can be changed to alter the performance of the system. The parameters of interest include diode length, anode-cathode gap spacing, and an electron absorbing collection rod.
K. Woolverton, M. Kristiansen, L.L. Hatfield   +2 more
openaire   +1 more source

Efficiency Enhancement of the Axial VIRCATOR

IEEE Transactions on Plasma Science, 2007
We present in this paper the particle-in-cell simulation results of a modified axial virtual cathode oscillator having a metallic drum of radius R1 placed coaxially inside the drift tube at a distance D1 from the foil anode. The enlarged parameter space permits control of the current transmitted to the collection plate, the net diode current, and the ...
Debabrata Biswas, Raghwendra Kumar
openaire   +1 more source

Pulsewidth Variation of an Axial Vircator

IEEE Transactions on Plasma Science, 2010
The KALI-1000 pulse power system has been used to generate single-pulse nanosecond-duration high-power microwaves from an axial virtual cathode oscillator. The typical electron beam parameters were 250 kV, 15 kA, and 100 ns, with a current density of a few hundreds of amperes per square centimeter. The shot-to-shot variation of the microwave pulsewidth
Amitava Roy, Sandeep Kumar Singh, Rakhee Menon, D Senthil Kumar, Saket Khandekar, Vijay Bhaskar Somu, Susant Chottray, P C Saroj, K V Nagesh, K C Mittal, D P Chakravarthy   +10 more
openaire   +1 more source

A High-Power, High-Efficiency S-Band Axial Vircator With Novel Waveguide Geometry

IEEE Transactions on Electron Devices
The VIRtual CAThode oscillatOR (circator) is a high-power microwave (HPM) source operating on the principle of virtual cathode formation and oscillation.
Patrizia Livreri
semanticscholar   +1 more source

Performances of Velvet Cathodes With Different Geometries in a Reflex Triode Vircator

IEEE Transactions on Plasma Science, 2020
A frequency tunable vircator, which has the reflex triode geometry, was designed and experimentally tested. The cloth velvet was used as the cathode material.
Emirhan Postacı, Hasan Erciyas, Nergis Yıldız Angın Atmaca, Ö. Akman, Selahattin Nesil, F. Yayıl, S. Berber, S. Çakır   +7 more
semanticscholar   +1 more source

Experiments with an S-band vircator

SPIE Proceedings, 1994
The experiments described used a Vircator operating in the frequency range 2.5 - 3.5 MHz and powered by a 10 ohm, 100 ns pulse generator operating at voltages up to 600 kV. The Vircator had a tunable resonant cavity and power was coupled out from one side. A series of experiments were carried out to elucidate various aspects of the Vircator's behavior.
D. E. Ashby, J. Allen, K. C. Hawkins
openaire   +1 more source

Development of Advanced Vircator and its Experimental Results

2024 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)
New configuration of Virtual Cathode Oscillator (VCO) has been studied for the generation of High Power Microwaves through simulation and experiments. Critical parameters such as sheet transparency and voltage variation are optimized to obtain maximum ...
M. S. Shivabhagya, D. S. Kumar, S. Antony, K. Naveen Kumar, Rakesh Kumar, S. K. Nayak, S. Datta   +6 more
semanticscholar   +1 more source

Combining Extreme Values Theory and Surrogate Modelling for the Study of a Vircator

International Conference on Plasma Science, 2020
Mainly due to their high computational and experimental costs (prohibitive number of experiments needed to carry on statistical inferences), High Power Electromagnetics (HPEM) are rarely devoted to the assessment of extreme values.
M. Almansoori, E. Neira, C. Kasmi, Felix Cabrera Vega, S. Lalléchère   +4 more
semanticscholar   +1 more source