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Magnetic field measurement system for HPM research
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.
2009 (English)In: Proc. of Radiovetenskap och kommunikation (RVK08), 2009, Vol. 1106, 86-93 p.Conference paper, Published paper (Refereed)
Abstract [en]

One method to characterize the radiated microwave field from a high-power microwave (HPM) source is to measure the radiated high-level electromagnetic field in several locations at a high sampling rate registering the frequency time dependence, thus being able to determine the radiated pattern and mode. A complete free-field measurement system for measuring the magnetic field component in high-level electromagnetic fields has been developed at FOI. The system consists of a B-dot sensor and a balun, both designed and constructed at FOI. The B-dot sensor is designed as two cylindrical loop sensors with differential output. The balun is a microstrip design etched on a dual sided PTFE circuit board. Complete systems have been calibrated at SP Technical Research Institute of Sweden. A method to analyze the data from the free-field systems has been developed.

Place, publisher, year, edition, pages
2009. Vol. 1106, 86-93 p.
Series
AIP Conference Proceedings, ISSN 0094-243X
National Category
Fusion, Plasma and Space Physics Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-34814ISI: 000264867300009OAI: oai:DiVA.org:kth-34814DiVA: diva2:423726
Conference
RVK
Note
QC 20110616Available from: 2011-06-16 Created: 2011-06-16 Last updated: 2012-11-22Bibliographically 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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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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