R. Jacquier

High resolution incoherent Thomson scattering diagnostic for the Resonant Antenna Ion Device (RAID) helicon plasmas

C. Stollberg, R Karimov, Ph. Guittienne, R. Jacquier et autres

We present a recent upgrade of the incoherent Thomson scattering (TS) diagnostic for the Resonant Antenna Ion Device (RAID), a linear plasma source based on helicon excitation operated at the Swiss Plasma Center at Ecole Polytechnique Fédérale de Lausanne. By operating in …

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Diagnostics for characterization of neutral beams parameters at TCV

A. Karpushov, Y. Andrèbe, B.P. Duval, R. Jacquier et autres

Abstract Injection of high-energy neutral beams (NBIs) of hydrogen isotopes is a well-established method for plasma heating, current drive, and diagnosis of magnetic confinement fusion devices, including tokamaks, stellarators and open systems. NBI diagnostics provide essential information for operation, protection, characterization, and …

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Helicon Wave-Plasma Interaction in Linear and Toroidal Geometries with Birdcage Resonant Antennas

S. P. H. Vincent, R Karimov, Ph. Guittienne, Cyrille Sepulchre et autres

Helicon wave fundamental properties are explored experimentally and numerically in linear and toroidal geometries in the low-temperature plasma devices RAID and TORPEX. The helicon wave-plasma interaction is studied in terms of wave damping, propagation conditions in toroidal geometry, and nonlinear behavior.

ch (code pays fourni par la source)

Determination of atomic hydrogen density and fluorescence decay time by 1D resolved, picosecond TALIF in the RAID linear device

Lyes Kadi, M. Baquero-Ruiz, Y. Andrèbe, Ph. Guittienne et autres

Abstract We report on the first 1D resolved two-photon absorption laser-induced fluorescence (TALIF) measurements of atomic hydrogen (H) performed in the Resonant Antenna Ion Device using a picosecond laser system. The results are obtained across a cylindrical plasma column with peak electron …

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Numerical and experimental investigations of a microwave interferometer for the negative ion source SPIDER

R. Agnello, R. Cavazzana, I. Furno, R. Jacquier et autres

Abstract The electron density close to the extraction grids and the co-extracted electrons represent a crucial issue when operating negative ion sources for fusion reactors. An excessive electron density in the plasma expansion region can indeed inhibit the negative ion production and …

ch (code pays fourni par la source)

Numerical and experimental investigations of a microwave interferometer for the negative ion source SPIDER

R. Agnello, R. Cavazzana, I. Furno, R. Jacquier et autres

The electron density close to the extraction grids and the co-extracted electrons represent a crucial issue when operating negative ion sources for fusion reactors. An excessive electron density in the plasma expansion region can indeed inhibit the negative ion production and introduce …

A 1.5D fluid—Monte Carlo model of a hydrogen helicon plasma

R. Agnello, G. Fubiani, I. Furno, Ph. Guittienne et autres

Abstract Helicon plasma sources operating with hydrogen or deuterium might be attractive for fusion applications due to their higher power efficiency compared to inductive radiofrequency plasma sources. In recent years, the resonant antenna ion device (RAID) has been investigating the physics of …

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A 1.5D fluid-Monte Carlo model of a hydrogen helicon plasma

R. Agnello, G. Fubiani, I. Furno, Ph. Guittienne et autres

Helicon plasma sources operating with hydrogen or deuterium might be attractive for fusion applications due to their higher power efficiency compared to inductive radiofrequency plasma sources. In recent years, the resonant antenna ion device (RAID) has been investigating the physics of helicon …

Latest experimental and theoretical advances in the production of negative ions in caesium-free plasmas

F. Taccogna, S. Béchu, Ane Aanesland, P. Agostinetti et autres

This topical review gathers the last updates concerning caesium-free negative ion sources presented during the $$63{\mathrm {rd}}$$ Course of the International school of Quantum Electronics of the Ettore Majorana Foundation and European collaborative works related to these lectures. Hence, beyond the frame …

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Negative hydrogen ion dynamics inside the plasma volume of a linear device: Estimates from particle-in-cell calculations

G. Fubiani, R. Agnello, I. Furno, Laurent Garrigues et autres

Negative hydrogen or deuterium ions are the precursor particles used to generate a high power beam of neutrals in order to heat the tokamak plasma core of magnetic fusion devices, inject current, and to some extent control instabilities. In the case of …

fr, ch, it (code pays fourni par la source)

Proton beam defocusing in AWAKE: comparison of simulations and measurements

A. A. Gorn, Marlene Turner, E. Adli, R. Agnello et autres

In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from the Super Proton Synchrotron (SPS) at CERN. The angular distribution of the protons deflected due to SSM is a quantitative measure of the process, which agrees with …

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Negative ion characterization in a helicon plasma source for fusion neutral beams by cavity ring-down spectroscopy and Langmuir probe laser photodetachment

R. Agnello, S. Béchu, I. Furno, Ph. Guittienne et autres

Negative ion characterization in a helicon plasma source for fusion neutral beams by cavity ring-down spectroscopy and Langmuir probe laser photodetachment, Agnello, R., Béchu, S., Furno, I., Guittienne, Ph., Howling, A.A., Jacquier, R., Plyushchev, G., Barbisan, M., Pasqualotto, R., Morgal, I., Simonin, …

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