Publications de Trach-Minh Tran

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The operation of a 92 GHz quasi-optical gyrotron having a resonator formed by a spherical mirror and a diffraction grating placed in -1 order Littrow mount is presented. A power of 150 kW with a Gaussian output pattern was measured. The Gaussian content in the output was 98% with less than 1% of depolarization. By optimizing the magnetic field al fixed frequency a maximum efficiency of 15% was reached. (C) 1996 American Institute of Physics.

Dynamical chaos is produced by the interaction between plasma particles and two electrostatic waves. Experiments performed in a linear magnetized plasma and a ID particle-in-cell simulation agree qualitatively: above a threshold wave amplitude, ion stochastic diffusion and heating occur on a fast time scale. Self-consistency appears to limit the extent of the heating process.

A detailed study of the operational capabilities of the W7-X/1MW gyrotron operated at 126GHz/TE26,7 is presented. This study is associated with the foreseen upgrade of TCV in which it is planned to add to the present EC system 3MW of additional RF power bringing the total EC-power to 7.5MW. This study is extended to a possible operation of the gyrotron at the ITER relevant frequency of 168GHz in the TE35,9 mode without implementing any further modification neither in the gyrotron nor in the gyrotron superco

The magnetron injection gun (MIG) is one of the most critical subcomponents in gyrotrons. The electron beam, which has the primary role on the gyrotron operation, is generated and configured at this part of the tube. The electron beam properties determine ...

Total bootstrap current calculations with the updated VENUS+δf code that incorporates energy convolution and the momentum correction technique have been performed for the reference tokamak JT-60U cases and for the experimental Large Helical Device (LH ...

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 geometry, the influ ...

In this Letter, it is shown that global, nonlinear, particle-in-cell (PIC) simulations of electron temperature driven turbulence recover the same level of transport as flux-tube codes when the level of statistical noise, associated with the PIC discretizat ...

To evaluate the bootstrap current in nonaxisymmetric toroidal plasmas quantitatively, a deltaf Monte Carlo method is incorporated into the moment approach. From the drift-kinetic equation with the pitch-angle scattering collision operator, the bootstrap cu ...

We have performed this work again.

Trach-Minh Tran

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Operation of a quasi-optical gyrotron with a Gaussian output coupler

Stochastic Plasma-Heating by Electrostatic-Waves - a Comparison between a Particle-in-Cell Simulation and a Laboratory Experiment

Design studies of the dual-frequency operation of the W7-X/140GHz/1MW gyrotron at 126GHz for TCV and 168GHz for ITER

Overview on recent progress in magnetron injection gun theory and design for high power gyrotrons

3D warm effects for low-frequency wave propagation in magnetically confined plasmas

Bootstrap current calculations with the SPBSC and the VENUS delta f codes for the Large Helical Device

Linear and non-linear studies of spurious backward-wave instabilities in a smooth-wall gyrotron beam duct

The role of plasma elongation on the linear damping of zonal flows

Nonlinear low noise particle-in-cell simulations of electron temperature gradient driven turbulence

Moment approach to the bootstrap current in nonaxisymmetric toroidal plasmas using deltaf Monte Carlo methods

Mode Content Analysis of the RF output of a Gyrotron Based on the Astigmatic Gaussian Beams of High Order

Benchmark of a semi-Lagrangian and a Lagrangian code for gyrokinetic simulations

Plasma Shape Effects on Geodesic Acoustic Oscillations

Noise control in global gyrokinetic particle simulations

Ion and Electron Dynamics in Nonlinear PIC simulations

Computational fusion plasma physics

LHD Bootstrap Current Coefficient Calculations with the VENUS+δ f code

Effects of Plasma Elongation on Geodesic Acoustic Modes

Plasma elongation and magnetic shear effects in nonlinear simulations of ITG-zonal flow turbulence

Computational fusion plasma physics