Radio-frequency current drive for thermonuclear fusion reactors.

Abstract:

:Principal research on energy from thermonuclear fusion uses Deuterium-Tritium plasmas magnetically trapped in toroidal devices. As major scientific problem for an economic (i.e., really feasible) reactor, we must understand how to lead strongly heated plasmas to sustain a high fusion gain while large fraction of current is self-produced via the presence of strong pressure gradient. To suppress turbulent eddies that impair thermal insulation and pressure tight of the plasma, current drive (CD) is necessary. However, tools envisaged so far in ITER (International Thermonuclear Experiment Rector) are unable accomplishing this task that requires efficiently and flexibly matching the natural current profiles of plasma. Consequently, viability of a thermonuclear reactor should be problematic. Multi-megawatt radio-frequency (RF) power coupled to plasma would produce the necessary CD, but modelling results based on previous understanding found difficult the extrapolation of this CD concept to reactor conditions of high temperature plasma, and greater flexibility of method would also be required. Here we present new model results based on standard quasilinear (QL) theory that allow establish conditions to drive efficiently and flexibly the RF-driven current at large radii of the plasma column, as necessary for the goal of a reactor.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Cardinali A,Castaldo C,Cesario R,Amicucci L,Galli A,Napoli F,Panaccione L,Riccardi C,Santini F,Schettini G,Tuccillo AA

doi

10.1038/s41598-018-27996-9

subject

Has Abstract

pub_date

2018-07-09 00:00:00

pages

10318

issue

1

issn

2045-2322

pii

10.1038/s41598-018-27996-9

journal_volume

8

pub_type

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