G. Le Bars
École Polytechnique Fédérale de Lausanne
10 Papers
12 Citations
G. Le Bars is an academic researcher from École Polytechnique Fédérale de Lausanne. The author has contributed to research in topics: Gyrotron & Electron. The author has an hindex of 1, co-authored 2 publications.
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Papers
Parasitic Oscillations in Smooth-Wall Circular Symmetric Gyrotron Beam Ducts
J. Genoud,Stefano Alberti,Trach-Minh Tran,G. Le Bars,P. Kaminski,J.-Ph. Hogge,Konstantinos A. Avramidis,Minh Quang Tran +7 more
TL;DR: In this article, the authors used TWANGlinspec to study parasitic oscillation that may occur in a realistic beam duct upstream to the gyrotron cavity, and the role of the connecting part between the beam duct and the cavity, called spacer, was highlighted and it was shown that the gyro backward wave TE modes excited in this region generally have their minimum starting current.
Self-consistent formation and steady-state characterization of trapped high-energy electron clouds in the presence of a neutral gas background
TL;DR: In this article , the formation and dynamics of electron clouds interacting with a background neutral gas through elastic and inelastic (ionization) collisions in coaxial geometries similar to gyrotron electron guns are considered.
First self-consistent simulations of trapped electron clouds in a gyrotron gun and comparison with experiments
G. Le Bars,Joaquim Loizu,J.-P. Hogge,Stefano Alberti,F. Romano,J. Genoud,Ioannis Gr. Pagonakis +6 more
TL;DR: In this article , the spontaneous formation of trapped electron clouds in coaxial geometries with strong externally applied azimuthal flows and in the presence of a residual neutral gas is simulated.
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FENNECS: a novel particle-in-cell code for simulating the formation of magnetized non-neutral plasmas trapped by electrodes of complex geometries
G. Le Bars,J. Loizu,S. Guinchard,J.-P. Hogge,A. Cerfon,S. Alberti,F. Romano,J. Genoud,P. Kamiński +8 more
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Linear and non-linear studies of spurious backward-wave instabilities in a smooth-wall gyrotron beam duct
J. Genoud,G. Le Bars,Stefano Alberti,P. Kaminski,Trach-Minh Tran +4 more
- 01 Aug 2017
TL;DR: In this paper, the influence of the beam duct geometry and the magnetic field profile on the instabilities threshold and on the quality of the electron beam was studied starting from a simple case with a basic geometry.