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Cross-Field Diffusion Quenching by Neutral Gas Injection in a Magnetized Plasma

Ambrogio Fasoli
1992
Journal Articles

Résumé

Cross-field transport of test ions is investigated in a linear Q-machine plasma. Test particles are created and followed in their motion by an optical tagging diagnostic scheme. Diffusion is demonstrated to be supported by classical mechanisms. When different noble buffer gases are injected, the plasma reacts in such a way that the diffusivity remains classical but its magnitude is considerably reduced.

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Ambrogio Fasoli
1992
Journal Articles

Résumé

Source officielle

Concepts associés (27)

Tokamak

thumb|Vue intérieure du tore du Tokamak à configuration variable (TCV), dont les parois sont recouvertes de tuiles de graphite. Un tokamak est un dispositif de confinement magnétique expérimental explorant la physique des plasmas et les possibilités de produire de l'énergie par fusion nucléaire. Il existe deux types de tokamaks aux caractéristiques sensiblement différentes, les tokamaks traditionnels toriques (objet de cet article) et les tokamaks sphériques.

Neutral-beam injection

Neutral-beam injection (NBI) is one method used to heat plasma inside a fusion device consisting in a beam of high-energy neutral particles that can enter the magnetic confinement field. When these neutral particles are ionized by collision with the plasma particles, they are kept in the plasma by the confining magnetic field and can transfer most of their energy by further collisions with the plasma. By tangential injection in the torus, neutral beams also provide momentum to the plasma and current drive, one essential feature for long pulses of burning plasmas.

Classical diffusion

Classical diffusion is a key concept in fusion power and other fields where a plasma is confined by a magnetic field within a vessel. It considers collisions between ions in the plasma that causes the particles to move to different paths and eventually leave the confinement volume and strike the sides of the vessel. The rate of diffusion scales with 1/B2, where B is the magnetic field strength, implies that confinement times can be greatly improved with small increases in field strength.

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Publications associées (8)

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Cross-Field Diffusion Quenching by Neutral Gas Injection in a Magnetized Plasma

Chattez avec Graph Search

First benchmark between the KINetic Deterministic NEutral Solver (KINDNES) and EIRENE

Advanced RF heating schemes in preparation for ICRF heating and fastion experiments in the W7-X stellarator

Global structure and magnetic components of geodesic acoustic modes in shaped tokamak plasmas