G. Le Bars
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View article: Electron trapping in gyrotron electron guns: Validation of the FENNECS code with the T-REX experiment
Electron trapping in gyrotron electron guns: Validation of the FENNECS code with the T-REX experiment Open
Gyrotrons are essential devices for the development of nuclear fusion, but their design and reliable operation still present numerous challenges. In particular, certain gyrotrons encounter issues related to trapped electron clouds in the m…
View article: Alpha-particle confinement in Infinity Two Fusion Pilot Plant baseline plasma design
Alpha-particle confinement in Infinity Two Fusion Pilot Plant baseline plasma design Open
In this work, we present a detailed assessment of fusion-born alpha-particle confinement, their wall loads, and stability of Alfvén eigenmodes driven by these energetic particles in the Infinity Two Fusion Pilot Plant Baseline Plasma Desig…
View article: The Infinity Two fusion pilot plant baseline plasma physics design
The Infinity Two fusion pilot plant baseline plasma physics design Open
We provide an assessment of the Infinity Two fusion pilot plant (FPP) baseline plasma physics design. Infinity Two is a four-field period, aspect ratio $A = 10$ , quasi-isodynamic stellarator with improved confinement appealing to a max- $…
View article: Predictions of core plasma performance for the Infinity Two fusion pilot plant
Predictions of core plasma performance for the Infinity Two fusion pilot plant Open
Transport characteristics and predicted confinement are shown for the Infinity Two fusion pilot plant baseline plasma physics design, a high field stellarator concept developed using modern optimization techniques. Transport predictions ar…
View article: Magnetohydrodynamic equilibrium and stability properties of the Infinity Two fusion pilot plant
Magnetohydrodynamic equilibrium and stability properties of the Infinity Two fusion pilot plant Open
The magnetohydrodynamic (MHD) equilibrium and stability properties of the Infinity Two fusion pilot plant baseline plasma physics design are presented. The configuration is a four-field period, aspect ratio $A = 10$ quasi-isodynamic stella…
View article: Design and first tests of the trapped electrons experiment T-REX
Design and first tests of the trapped electrons experiment T-REX Open
Gyrotrons are essential for electron cyclotron resonance heating in fusion reactors, making efficient operation crucial for advancing fusion energy. Past experiments revealed instability issues due to trapped electrons in the magnetron inj…
View article: First self-consistent simulations of trapped electron clouds in a gyrotron gun and comparison with experiments
First self-consistent simulations of trapped electron clouds in a gyrotron gun and comparison with experiments Open
We report on the initial validation of the novel code FENNECS, which simulates the spontaneous formation of trapped electron clouds in coaxial geometries with strong externally applied azimuthal flows and in the presence of a residual neut…
View article: Self-consistent formation and steady-state characterization of trapped high-energy electron clouds in the presence of a neutral gas background
Self-consistent formation and steady-state characterization of trapped high-energy electron clouds in the presence of a neutral gas background Open
This study considers the self-consistent 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. The…
View article: Self-consistent formation and steady-state characterisation of trapped high energy electron clouds in the presence of a neutral gas background
Self-consistent formation and steady-state characterisation of trapped high energy electron clouds in the presence of a neutral gas background Open
This study considers the self-consistent formation and dynamics of electron clouds interacting with a background neutral gas through elastic and inelastic (ionisation) collisions in coaxial geometries similar to gyrotron electron guns. The…
View article: Linear and non-linear studies of spurious backward-wave instabilities in a smooth-wall gyrotron beam duct
Linear and non-linear studies of spurious backward-wave instabilities in a smooth-wall gyrotron beam duct Open
Recently developed self-consistent models for beam-wave interaction simulations of a gyrotron oscillator are used to study spurious backward-wave instabilities in smooth-wall metallic beam ducts. Starting from a simple case with a basic ge…