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Experimental study of a vircator with premodulated electron beam
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
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2011 (English)In: Proc. of Pulse Power Conference (PPC 2011)”, Chicago,USA, June 2011., 2011, 815-818 p.Conference paper, Published paper (Refereed)
Abstract [en]

An initial experimental study of a vircator where a feedback mechanism is used to premodulate the electron beam has been performed. The anode-cathode gap distance and the applied voltage were varied and their influence on the frequency content and field strength of the generated microwave pulse are investigated and compared with particle in cell simulations. The frequency content of the microwave radiation was in good agreement between experiments and simulations. The vircator was very narrow banded at 2 GHz.

Place, publisher, year, edition, pages
2011. 815-818 p.
Keyword [en]
Anode-cathode gap distance; Applied voltages; Experimental studies; Feedback mechanisms; Field strengths; Frequency contents; Microwave pulse; Particle-in-cell simulations; Vircators, Electron beams
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-105093DOI: 10.1109/PPC.2011.6191519Scopus ID: 2-s2.0-84861366982ISBN: 978-145770629-5 (print)OAI: oai:DiVA.org:kth-105093DiVA: diva2:569994
Conference
Pulse Power Conference (PPC 2011)”, Chicago, USA, June 2011
Note

QC 20121116

Available from: 2012-11-16 Created: 2012-11-16 Last updated: 2012-11-22Bibliographically approved
In thesis
1. Design and Experiments with High Power Microwave Sources: The Virtual Cathode Oscillator
Open this publication in new window or tab >>Design and Experiments with High Power Microwave Sources: The Virtual Cathode Oscillator
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

High-Power Microwaves (HPM) can be used to intentionally disturb or destroy electronic equipment at a distance by inducing high voltages and currents.This thesis presents results from simulations and experiments with a narrow band HPM source, the vircator. The high voltages needed to generate HPM puts the vircator under great stress, especially the electrode materials. Several electrode materials have been tested for endurance and their influence on the characteristics of the microwave pulse. With the proper materials the shot-to-shot variations are small and the geometry can be optimized in terms of e.g. output power or frequency content. Experiments with a resonant cavity added to the vircator geometry showed that with proper tuning of the cavity, the frequency content of the microwave radiation is very narrow banded and in this case the highest fields are generated. The vircator can be built in different geometries. Four different vircator types are investigated and the coaxial vircator is found to have advantages as a high radiated power and the possibility to vary the polarization during operation.Since HPM pulses are very short and have high field strengths, special field probes are needed. An HPM pulse may shift in frequency during the pulse and therefore it is very important to be able to compensate for the frequency dependence of the entire measurement system. The development and use of a far-field measurement system is described.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. xx, 43 p.
Series
Trita-EE, ISSN 1653-5146 ; 2012:056
Keyword
High Power Microwaves Vircator
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-104794 (URN)978-91-7501-568-2 (ISBN)
Public defence
2012-12-14, F3, Lindstedtsvägen 26, KTH, Stockholm, 13:30 (English)
Opponent
Supervisors
Note

QC 20121122

Available from: 2012-11-22 Created: 2012-11-13 Last updated: 2012-11-22Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Output format
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