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Experimental Studies of the Influence of a Resonance Cavity in an Axial Vircator
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
Swedish Defence Research Agency (FOI) Defence & Security, Systems and Technology, Grindsjön Research Centre, Tumba, Sweden.
Swedish Defence Research Agency (FOI) Defence & Security, Systems and Technology, Grindsjön Research Centre, Tumba, Sweden.
2010 (English)In: IEEE Transactions on Plasma Science, ISSN 0093-3813, E-ISSN 1939-9375, Vol. 38, no 6, 1318-1324 p.Article in journal (Refereed) Published
Abstract [en]

Experiments on an axial virtual-cathode oscillator (vircator) with a resonance cavity enclosing the virtual cathode are reported. The vircator is driven by a repetitive Marx generator operating in a single-shot mode. To be able to separate different radiation mechanisms, the design of the vircator allows adjustment of the cavity depth as well as the way microwave radiation is extracted. The microwave radiation is measured with a pair of free-field B-dot sensors. The maximum field strengths were registered when the bandwidth was very narrow.

Place, publisher, year, edition, pages
2010. Vol. 38, no 6, 1318-1324 p.
Keyword [en]
axial virtual-cathode oscillator (vircator), high-power microwave, resonant cavity
National Category
Fusion, Plasma and Space Physics Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-34819DOI: 10.1109/TPS.2010.2042822ISI: 000281764600023OAI: oai:DiVA.org:kth-34819DiVA: diva2:423741
Note
QC 20110616Available from: 2011-06-16 Created: 2011-06-16 Last updated: 2017-12-11Bibliographically approved
In thesis
1. High Power Microwave Sources: design and experiments
Open this publication in new window or tab >>High Power Microwave Sources: design and experiments
2011 (English)Licentiate 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 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 the highest radiated fields are registred. 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 so 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, 2011. xvi,33 p.
Series
Trita-EE, ISSN 1653-5146 ; 2011:046
National Category
Fusion, Plasma and Space Physics Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-34072 (URN)978-91-7501-044-1 (ISBN)
Presentation
2011-06-10, Seminarierummet, avd för Rymd- och plasmafysik, KTH, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20110616Available from: 2011-06-16 Created: 2011-05-25 Last updated: 2011-06-16Bibliographically approved
2. 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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