Publication

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

Ivo Furno, Philippe Frédérique Bruno Guittienne
2026

Abstract

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 the visible range, which facilitates the recording of the spectrally resolved TS signal with a gated camera, this system has greatly enhanced the ability to characterize the plasmas generated by RAID in argon, helium, deuterium, and hydrogen. Parameter scans demonstrate good agreement with a Double Langmuir Probe (DLP) diagnostic, while highlighting the need for refinement of the DLP analysis routines in the presence of large magnetic fields. Detailed radial profiles of electron density and temperature are obtained in different working gases, in particular, in the challenging conditions of hydrogen, and can potentially provide new insights into helicon physics and plasma transport processes. This enhanced diagnostic capability establishes a solid foundation for future studies of helicon wave behavior, diagnostic development, and atomic physics investigations on RAID.

Official source

https://infoscience.epfl.ch/entities/publication/37cfaec5-2063-4184-bb8b-5dbe49da7599

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Ivo Furno, Philippe Frédérique Bruno Guittienne
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/37cfaec5-2063-4184-bb8b-5dbe49da7599

About this result

Related concepts (32)

Plasma (physics)

Plasma () is one of four fundamental states of matter, characterized by the presence of a significant portion of charged particles in any combination of ions or electrons. It is the most abundant form of ordinary matter in the universe, being mostly associated with stars, including the Sun. Extending to the rarefied intracluster medium and possibly to intergalactic regions, plasma can be artificially generated by heating a neutral gas or subjecting it to a strong electromagnetic field.

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A plasma propulsion engine is a type of electric propulsion that generates thrust from a quasi-neutral plasma. This is in contrast with ion thruster engines, which generate thrust through extracting an ion current from the plasma source, which is then accelerated to high velocities using grids/anodes. These exist in many forms (see electric propulsion). However, in the scientific literature, the term "plasma thruster" sometimes encompasses thrusters usually designated as "ion engines".

Magnetic field

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets.

Related publications (32)

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

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