Design of an Energy Recovery System for a Gyrotron Backward-Wave Oscillator

Author

Zhang, Liang ; He, Wenlong ; Cross, Adrian W. ; Phelps, Alan D R ; Ronald, Kevin ; Whyte, Colin G.

Author_Institution

Dept. of Phys., Univ. of Strathclyde, Glasgow

Volume

37

Issue

3

fYear

2009

fDate

3/1/2009 12:00:00 AM

Firstpage

390

Lastpage

394

Abstract

To realize the full potential of a gyrotron backward-wave oscillator (gyro-BWO), an energy recovery system was designed using Particle-In-Cell (PIC) simulations and optimized using both a genetic algorithm and PIC simulations. Simulations were carried out to optimize a periodic structure for separation of the spent electron beam and the output radiation produced by a gyro-BWO in the 8.0-9.5 GHz frequency range. The spent electron beam can be collected using a multistage depressed collector. The number and electric potentials of the electrodes were optimized to achieve the best overall recovery efficiency for specific parameters of the spent beam. The 3-D PIC code MAGIC was used to simulate the electrons´ trajectories and a genetic algorithm was used to refine the electrode shapes for optimum efficiency.

Keywords

backward wave oscillators; genetic algorithms; gyrotrons; electrode shapes; energy recovery system; frequency 8 GHz to 9.5 GHz; genetic algorithm; gyrotron backward wave oscillator; multistage depressed collector; output radiation; particle-in-cell simulation; spent electron beam; Depressed collector; energy recovery; genetic algorithm; gyrotron backward-wave oscillator (gyro-BWO);

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2008.2012108

Filename

4796290