Evaluation of experimentally measured non-stationary oscillations in gyrotrons using adequate simulation methods

In order to properly simulate cases in which gyrotrons exhibit fast temporally varying oscillations, such as non-stationary oscillations or possible dynamic After-Cavity Interaction (ACI), an adequate model for the beam-wave interaction has to be used. We will show that the commonly used assumption...

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Bibliographic Details
Main Authors: Braunmueller, F., Alberti, S., Tran, T.-M, Genoud, J., Vuillemin, Q., Hogge, J.-P, Tran, M. Q.
Format: Conference Proceeding
Language:English
Subjects:
Adaptation models
Computer simulation
Conferences
Constants
Gyrotrons
Infrared
Mathematical model
Oscillations
Oscillators
Particle in cell technique
Physics
Plasmas
Time-frequency analysis
Transit time
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Summary:In order to properly simulate cases in which gyrotrons exhibit fast temporally varying oscillations, such as non-stationary oscillations or possible dynamic After-Cavity Interaction (ACI), an adequate model for the beam-wave interaction has to be used. We will show that the commonly used assumption of considering a constant wave-field envelope during the electron transit time has to be abandoned. The appropriate model (reduced 1D Particle-In-Cell (PIC) model) is briefly presented and the implications of using an inadequate model are illustrated. For the case of a 150W/260GHz gyrotron, non-stationary simulations with the new model will be compared to experiment and used in order to investigate the underlying mechanism of these oscillations.
ISSN:2162-2027
2162-2035
DOI:10.1109/IRMMW-THz.2015.7327570