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Investigations on Improving Broadband Boundary Conditions in Gyrotron Interaction Modelling

Wu, Chuanren

Abstract:
Gyrotrons are microwave tubes capable of providing mega-watt power at millimetric wavelengths. The microwave power is produced by the conversion of the kinetic energy of an electron beam to electromagnetic wave energy. Simulations of the beam-wave interaction in the gyrotron cavity are essential for gyrotron design, as well as theoretical and experimental studies.
In the usual gyrotron operation the spectrum of the generated radiation is concentrated around the nominal frequency. For this reason, the usual simulations consider only a narrow-band output spectrum (e.g. several GHz bandwidth comparing with the working frequency in the range of 100-200 GHz). As a result, the typical existing codes use a single-frequency radiation boundary condition for the generated electromagnetic field in the cavity. This condition is matched only at one frequency. However, there are two important aspects, which motivate an advanced formulation and implementation of the cavity boundary condition. Firstly, the occurrence of broadband effects (which may be several tens of GHz) in some cases, like dynamic after-cavity-interaction or modulation side-bands, requires a broadband boundary condition. ... mehr

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Volltext §
DOI: 10.5445/IR/1000100063
Veröffentlicht am 25.11.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochfrequenztechnik und Elektronik (IHE)
Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Hochschulschrift
Publikationsjahr 2014
Sprache Englisch
Identifikator KITopen-ID: 1000100063
HGF-Programm 31.03.02 (POF III, LK 01)
Plasma Heizsysteme
Verlag Karlsruhe
Umfang I, 56 S.
Art der Arbeit Abschlussarbeit - Master
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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