NDLI: Features of wave processes in pre-modulated electron beam and its interaction with electromagnetic field

Content Provider	IEEE Xplore Digital Library
Author	Krasnova, Galina M.
Copyright Year	2014
Description	Author affiliation: National Research Saratov State University, 83 Astrakhanskaya Street, 410012 Russian Federation (Krasnova, Galina M.)
Abstract	Wave processes in pre-modulated electron stream interacted with electromagnetic field has been considered in the framework of 2-dim linear theory. Influences of space charge (thin beam model [1]) and finite focusing magnetic field have been taken into account. For describing the interaction the system included excitation equation of rf electric field and equations of rf electron displacements has been used. Analysis [2] predicted the excitation of space charge waves and cyclotron waves and the resonance occurrence at synchronism of one of them with wave in transmission line. In some cases space charge leads to instability appearance. Two types of instability in strip and tubular electron streams have been defined: spatial static and rf instability. Special attention is given to the rf instability, occurring in the interaction with e/m fields. Its condition has been derived taking into account the effects of both the space charge and magnetic fields, and it is pointed at possibility of some improvement of interaction efficiency. Electron flow pre-modulation is possible especially due to using of photo-cathodes and cold cathodes that could be applied in THz devices because of their peculiarities. By setting initial conditions in different ways the effect of magnetic field on interaction has been investigated in photo-TWT, carcinotrode (BWO with emission automodulation [3]), BWO in pre-generation regime, also its influence on behavior of noise factor in TWT has been considered. Successive approximation and dispersion equation methods have been applied for solving. The resonances allow to investigate two-waves approaching, in which start-up conditions of carcinotrode (synchronic regime, earlier unexplored cyclotron resonance regime) have been derived. The conformity of results in general case and in two-waves approaching is shown.
Starting Page	1
Ending Page	1
File Size	129197
Page Count	1
File Format	PDF
ISBN	9781479927111
e-ISBN	9781479927135
DOI	10.1109/PLASMA.2014.7012557
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-05-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Space charge Mathematical model Magnetic fields Equations Electron beams Electromagnetic fields
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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