Integrated operation scenarios: Chapter 6 of the special issue: on the path to tokamak burning plasma operation

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Experimental confirmation of efficient island divertor operation and successful neoclassical transport optimization in Wendelstein 7-X

Jieping Zhu, Nicola Vianello, Jonathan Marc Philippe Faustin, Eduardo Sanchez, Jonathan Graves, Alberto Bottino, Emiliano Fable, Joaquim Loizu Cisquella, Frank Rüdiger Wagner, Thomas Binderup Jensen, Attila Bencze, Gregory Vogel, Antoine Baillod, Mike Machielsen

We present recent highlights from the most recent operation phases of Wendelstein 7-X, the most advanced stellarator in the world. Stable detachment with good particle exhaust, low impurity content, and energy confinement times exceeding 100 ms, have been ...

IOP Publishing Ltd2022

Technical and economic feasibility study of high-current HTS bus bars for fusion reactors

Rainer Wesche, Kamil Sedlák, Roberto Guarino

In this study, we present a technical and economic assessment of high-current HTS bus bars for primary use in fusion reactors. Our objective is to verify the technical feasibility of such conductors and, for this purpose, we carry out a conceptual design o ...

Elsevier2022

Nature of ideal MHD instabilities as described by multi-region relaxed MHD

Joaquim Loizu Cisquella, Antoine Baillod

In this work, the stepped pressure equilibrium code (SPEC) (Hudson et al 2012 Phys. Plasmas 19 112502), which computes the equilibria of the multi-region relaxed magnetohydrodynamic energy principle (MRxMHD), has been upgraded to determine the MRxMHD stabi ...

2022

Millimeter-wave beam scattering and induced broadening by plasma turbulence in the TCV tokamak

Stefano Alberti, Timothy Goodman, Ivo Furno, Paolo Ricci

The scattering of millimeter-wave beams from electron density fluctuations and the associated beam broadening are experimentally demonstrated. Using a dedicated setup, instantaneous deflection and (de-)focusing of the beam due to density blobs on the beam ...

IOP Publishing Ltd2021

Evidence for Alfven eigenmodes driven by alpha particles in D-He-3 fusion experiments on JET

Henri Weisen

Alfven eigenmodes (AEs) driven by energetic alpha particles can lead to enhanced fast ion transport and losses, thereby degrading the plasma performance in ITER and future magnetic confinement fusion reactors. Unexpectedly, AEs with negative toroidal mode ...

IOP Publishing Ltd2021

A phase-contrast-imaging core fluctuation diagnostic and first-principles turbulence modeling for JT-60SA

Stefano Coda, Stephan Brunner, Matthieu Toussaint, Aylwin Iantchenko

A core fluctuation diagnostic based on the phase-contrast imaging (PCI) technique has been designed for the JT-60SA tokamak, with the assistance of a synthetic diagnostic coupled to a gyrokinetic code. Using a tangentially viewing geometry, this system wou ...

IOP Publishing Ltd2021

Edge turbulence in ISTTOK: a multi-code fluid validation

Paolo Ricci, Fabio Riva, Davide Galassi, Rogério Manuel Cabete De Jesus Jorge

Fluid models used to study the edge plasma region need to be benchmarked against similar conditions given that models can strongly differ in complexity and therefore the results they produce. Via this validation study undertaken through the framework of EU ...

2021

Approaching detachment in I-mode-response of core confinement and the edge pedestal in the ASDEX Upgrade tokamak

Antoine Pierre Emmanuel Alexis Merle

Experiments on nitrogen assisted divertor detachment in the improved energy confinement mode (I-mode) are reported from the ASDEX Upgrade tokamak. When nitrogen is introduced into the divertor and radiation losses cool the divertor plasma down, a loss of c ...

IOP Publishing Ltd2021

Plasma confinement mode classification using a sequence-to-sequence neural network with attention

Alessandro Pau, Gino Marceca

In a typical fusion experiment, the plasma can have several possible confinement modes. At the tokamak a configuration variable, aside from the low (L) and high (H) confinement modes, an additional mode, dithering (D), is frequently observed. Developing me ...

IOP Publishing Ltd2021