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Proof of Principle Experiments on Direct Generation of the TE11 Mode in a Coaxial Vircator
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2010 (English)In: IEEE Transactions on Plasma Science, ISSN 0093-3813, E-ISSN 1939-9375, Vol. 38, no 1, 26-31 p.Article in journal (Refereed) Published
Abstract [en]

Experiments on a coaxial vircator with a sectioned emitter are reported. The emitting area is sectioned to form two opposing emitters in order to favor growth of the TE11 mode and inhibit growth of the TM01 mode that is usually excited in a coaxial vircator. Experiments are performed using a compact 320-J 400-kV Marx generator and a compact coaxial vircator built in a standard 8 '' vacuum tube. The radiated magnetic-field strength is measured by means of four free-field (B-dot) probes, and experiments show that sectioning the emitter does, in fact, lead to generation of the TE11 mode.

Place, publisher, year, edition, pages
2010. Vol. 38, no 1, 26-31 p.
Keyword [en]
Coaxial, sectioned emitter, TE11 mode, vircator
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-105097DOI: 10.1109/TPS.2009.2035502ISI: 000273565800004OAI: oai:DiVA.org:kth-105097DiVA: diva2:570011
Note

QC 20121116

Available from: 2012-11-16 Created: 2012-11-16 Last updated: 2017-12-07Bibliographically 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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Möller, CeciliaElfsberg, MattiasHurtig, Tomas
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