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Title: Novel linear analysis for a gyrotron oscillator based on a spectral approach

Abstract

With the focus of gaining a better physical insight into linear regimes in gyrotrons, a new linear model was developed. This approach is based on a spectral approach for solving the self-consistent system of equations describing the wave-particle interaction in the cavity of a gyrotron oscillator. Taking into account the wall-losses self-consistently and including the main system inhomogeneities in the cavity geometry and in the magnetic field, the model is appropriate to consider real system parameters. The prime advantage of the spectral approach, compared with a time-dependent approach, is the possibility to describe all of the stable and unstable modes, respectively, with negative and positive growth rates. This permits to reveal the existence of a new set of eigenmodes, in addition to the usual eigenmodes issued from cold-cavity modes. The proposed model can be used for studying other instabilities such as, for instance, backward waves potentially excited in gyrotron beam tunnels.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [2]
  1. Ecole Polytechnique Federale Lausanne (Switzlerland)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1557632
Grant/Contract Number:  
FC02-93ER54186
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 4; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Genoud, J., Tran, T. M., Alberti, S., Braunmueller, F., Hogge, J. -Ph., Tran, M. Q., Guss, W. C., and Temkin, R. J. Novel linear analysis for a gyrotron oscillator based on a spectral approach. United States: N. p., 2016. Web. doi:10.1063/1.4945611.
Genoud, J., Tran, T. M., Alberti, S., Braunmueller, F., Hogge, J. -Ph., Tran, M. Q., Guss, W. C., & Temkin, R. J. Novel linear analysis for a gyrotron oscillator based on a spectral approach. United States. doi:10.1063/1.4945611.
Genoud, J., Tran, T. M., Alberti, S., Braunmueller, F., Hogge, J. -Ph., Tran, M. Q., Guss, W. C., and Temkin, R. J. Thu . "Novel linear analysis for a gyrotron oscillator based on a spectral approach". United States. doi:10.1063/1.4945611. https://www.osti.gov/servlets/purl/1557632.
@article{osti_1557632,
title = {Novel linear analysis for a gyrotron oscillator based on a spectral approach},
author = {Genoud, J. and Tran, T. M. and Alberti, S. and Braunmueller, F. and Hogge, J. -Ph. and Tran, M. Q. and Guss, W. C. and Temkin, R. J.},
abstractNote = {With the focus of gaining a better physical insight into linear regimes in gyrotrons, a new linear model was developed. This approach is based on a spectral approach for solving the self-consistent system of equations describing the wave-particle interaction in the cavity of a gyrotron oscillator. Taking into account the wall-losses self-consistently and including the main system inhomogeneities in the cavity geometry and in the magnetic field, the model is appropriate to consider real system parameters. The prime advantage of the spectral approach, compared with a time-dependent approach, is the possibility to describe all of the stable and unstable modes, respectively, with negative and positive growth rates. This permits to reveal the existence of a new set of eigenmodes, in addition to the usual eigenmodes issued from cold-cavity modes. The proposed model can be used for studying other instabilities such as, for instance, backward waves potentially excited in gyrotron beam tunnels.},
doi = {10.1063/1.4945611},
journal = {Physics of Plasmas},
number = 4,
volume = 23,
place = {United States},
year = {2016},
month = {4}
}

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