Results 61 to 70 of about 842 (116)

Vircator operation with plasma assistance

IEEE Conference Record - Abstracts. PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pulsed Power Conference (Cat. No.01CH37255), 2002
Summary form only given, as follows. The experiments were carried out in the AGAT accelerator, which is a microsecond diode with a magnetic insulation to study the influence of plasma on the processes of virtual cathode (VC) formation, HF-generation, and plasma ions acceleration.
I.N. Onishchenko, V.A. Balakirev, I.I. Magda, S.S. Pushkarev   +3 more
openaire   +1 more source

Study the Spent Electron Beams Based Low-Voltage Vircator

International Conference on Plasma Science, 2020
It is well known that in such amplifying microwave devices as a traveling-wave tubes (TWT) and a klystrons, the electron beam at the exit from the interaction space has a significant electron velocity spread and a electron beam residual grouping1.
Y. Kalinin, S. A. Makarkin, A. Starodubov   +2 more
semanticscholar   +1 more source

Influence of Reflector Transparency and Axial Magnetic Field on Efficiency and Mode Purity of a Multi-reflector Axial Vircator

International Vacuum Electronics Conference
A multistage axial virtual cathode oscillator (vircator) employing finite-transparency reflector disks is investigated using self-consistent particle-in-cell simulations.
Nani Medicherla, A. K. Jha, R. Seshadri, S. K. Datta, M. Kartikeyan   +4 more
semanticscholar   +1 more source

Efficiency Enhancement in an S-Band Axial Vircator

International Vacuum Electronics Conference
This paper presents a high-efficiency S-band axial virtual cathode oscillator (Vircator) for high-power microwave (HPM) applications. The design introduces an innovative waveguide geometry obtained by integrating conical and cylindrical metallic ...
P. Livreri
semanticscholar   +1 more source

Characterization of modes in coaxial vircator

IEEE Transactions on Plasma Science, 2006
Modes' character of high-power microwave (HPM) pulses generated in coaxial vircator is discussed. The electromagnetic (EM) field gains due to beam-wave interaction for TM/sub 01/ and TE/sub 11/ modes are derived according to the E-field distribution pattern inside the anode cavity. Two-and-a-half dimensional (2.5-D) and three-dimensional (3-D) computer
null Hao Shao, null Guozhi Liu, null Zhanfeng Yang, null Changhua Chen, null Zhimin Song, null Wenhua Huang   +5 more
openaire   +1 more source

Computer modelling of a coaxial VIRCATOR

IEEE Conference Record - Abstracts. PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pulsed Power Conference (Cat. No.01CH37255), 2002
Summary form only given, as follows. We have made a computer model of a coaxial VIRCATOR being developed at TTU. Since successful operation of a vircator is based on the highly nonlinear process of consecutive appearance and disappearance of a virtual cathode (hence the name virtual cathode oscillator), algebraic analysis of the beam/field interaction ...
W.K. Toh, X. Chen, J. Watkins, P.A. Lindsay, K. Woolverton, M. Kristiansen   +5 more
openaire   +1 more source

Study of virpertron — Vircator with dielectric inserts

2017 Eighteenth International Vacuum Electronics Conference (IVEC), 2017
We propose a novel approach for the design of virtual cathode oscillator in this work. As a new concept, we suggest the microwave system containing annular relativistic electron beam travelling through the drift space with dielectric inserts characterized by different values of permittivity. In this case, virtual cathode which is the source of powerful
Alexey G. Petrik, Semen A. Kurkin, Nikita S. Frolov, Alexey A. Koronovskii, Alexander E. Hramov, Alexander E. Dubinov   +5 more
openaire   +1 more source

Plasma formation in a double-gap vircator

Journal of Applied Physics, 2010
Time-resolved light emission imaging was used to observe the plasma formation within the cavity of the double-gap vircator powered by a sub-microsecond generator (∼500 kV, ∼10 kA, ∼500 ns). The vircator generated well reproducible S-band microwave pulses of ∼200 MW peak power and up to 200 ns full duration. The plasma light emission was observed ∼30 ns
T. Queller, A. Shlapakovski, Ya. E. Krasik   +2 more
openaire   +1 more source

Vircator efficiency enhancement assisted by plasma

IEEE Transactions on Plasma Science, 2006
Experimental studies of microwave radiation generation in a system with a relativistic electron beam of over-limiting current and an external plasma source have been carried out. The results have shown that the presence of plasma essentially increases the power of microwave radiation in comparison to the vacuum case.
P.T. Chupikov, R.J. Faehl, I.N. Onishchenko, Y.V. Prokopenko, S.S. Pushkarev   +4 more
openaire   +1 more source

Improved efficiency on a coaxial vircator geometry

25th Anniversary, IEEE Conference Record - Abstracts. 1998 IEEE International Conference on Plasma Science (Cat. No.98CH36221), 2002
Summary form only given. The coaxial virtual cathode oscillator (vircator) is an attractive microwave device due to its simplicity, but suffers from low efficiency. The coaxial vircator geometry has many physical parameters that can be changed to alter performance and possibly increase the efficiency.
K. Woolverton, M. Kristiansen, L.L. Hatfield   +2 more
openaire   +1 more source