Limiting current of intense electron beams in a decelerating gap

G. S. Nusinovich; B. L. Beaudoin; C. Thompson; J. A. Karakkad; T. M. Antonsen

doi:10.1063/1.4942175

Limiting current of intense electron beams in a decelerating gap

G. S. Nusinovich, B. L. Beaudoin, C. Thompson, J. A. Karakkad, T. M. Antonsen

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

For numerous applications, it is desirable to develop electron beam driven efficient sources of electromagnetic radiation that are capable of producing the required power at beam voltages as low as possible. This trend is limited by space charge effects that cause the reduction of electron kinetic energy and can lead to electron reflection. So far, this effect was analyzed for intense beams propagating in uniform metallic pipes. In the present study, the limiting currents of intense electron beams are analyzed for the case of beam propagation in the tubes with gaps. A general treatment is illustrated by an example evaluating the limiting current in a high-power, tunable 1-10 MHz inductive output tube (IOT), which is currently under development for ionospheric modification. Results of the analytical theory are compared to results of numerical simulations. The results obtained allow one to estimate the interaction efficiency of IOTs.

Original language	English
Article number	023114
Journal	Physics of Plasmas
Volume	23
Issue number	2
DOIs	https://doi.org/10.1063/1.4942175
State	Published - Feb 1 2016
Externally published	Yes

Funding

This work was supported by the Air Force Office of Scientific Research under Grant No. FA95501410019.

Funders	Funder number
Air Force Office of Scientific Research	FA95501410019

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abstract = "For numerous applications, it is desirable to develop electron beam driven efficient sources of electromagnetic radiation that are capable of producing the required power at beam voltages as low as possible. This trend is limited by space charge effects that cause the reduction of electron kinetic energy and can lead to electron reflection. So far, this effect was analyzed for intense beams propagating in uniform metallic pipes. In the present study, the limiting currents of intense electron beams are analyzed for the case of beam propagation in the tubes with gaps. A general treatment is illustrated by an example evaluating the limiting current in a high-power, tunable 1-10 MHz inductive output tube (IOT), which is currently under development for ionospheric modification. Results of the analytical theory are compared to results of numerical simulations. The results obtained allow one to estimate the interaction efficiency of IOTs.",

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AB - For numerous applications, it is desirable to develop electron beam driven efficient sources of electromagnetic radiation that are capable of producing the required power at beam voltages as low as possible. This trend is limited by space charge effects that cause the reduction of electron kinetic energy and can lead to electron reflection. So far, this effect was analyzed for intense beams propagating in uniform metallic pipes. In the present study, the limiting currents of intense electron beams are analyzed for the case of beam propagation in the tubes with gaps. A general treatment is illustrated by an example evaluating the limiting current in a high-power, tunable 1-10 MHz inductive output tube (IOT), which is currently under development for ionospheric modification. Results of the analytical theory are compared to results of numerical simulations. The results obtained allow one to estimate the interaction efficiency of IOTs.

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Limiting current of intense electron beams in a decelerating gap

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