Multi-scale turbulence simulation suggesting improvement of electron heated plasma confinement

S Maeyama, TH Watanabe, M Nakata… - Nature …, 2022 - nature.com
Turbulent transport is a key physics process for confining magnetic fusion plasma. Recent
theoretical and experimental studies of existing fusion experimental devices revealed the …

Overview of tokamak turbulence stabilization by fast ions

J Citrin, P Mantica - Plasma Physics and Controlled Fusion, 2023 - iopscience.iop.org
In recent years tokamak experiments and modelling have increasingly indicated that the
interaction between suprathermal (fast) ions and thermal plasma can lead to a reduction of …

New high-confinement regime with fast ions in the core of fusion plasmas

A Di Siena, R Bilato, T Görler, AB Navarro, E Poli… - Physical Review Letters, 2021 - APS
The key result of the present work is the theoretical prediction and observation of the
formation of a new type of transport barrier in fusion plasmas, called F-ATB (fast ion-induced …

Observation of a reduced-turbulence regime with boron powder injection in a stellarator

F Nespoli, S Masuzaki, K Tanaka, N Ashikawa… - Nature Physics, 2022 - nature.com
In state-of-the-art stellarators, turbulence is a major cause of the degradation of plasma
confinement. To maximize confinement, which eventually determines the amount of nuclear …

H-mode transition in the TJ-II stellarator plasmas

T Estrada, C Hidalgo - Philosophical Transactions of the …, 2023 - royalsocietypublishing.org
Since the first H-mode transitions were observed in TJ-II plasmas in 2008, an extensive
experimental effort has been done aiming at better physics understanding of confinement …

First-principles based plasma profile predictions for optimized stellarators

AB Navarro, A Di Siena, JL Velasco, F Wilms… - Nuclear …, 2023 - iopscience.iop.org
In the present Letter, first-of-its-kind computer simulations predicting plasma profiles for
modern optimized stellarators—while self-consistently retaining neoclassical transport …

On how fast ions enhance the regulation of drift wave turbulence by zonal flows

GJ Choi, PH Diamond, TS Hahm - Nuclear Fusion, 2023 - iopscience.iop.org
This paper presents a mechanism for enhanced regulation of drift wave turbulence by zonal
flows in the presence of a fast ion population. It demonstrates that dilution effects due to the …

Nonlinear electromagnetic interplay between fast ions and ion-temperature-gradient plasma turbulence

A Di Siena, T Görler, E Poli, AB Navarro… - Journal of Plasma …, 2021 - cambridge.org
In strong electromagnetic regimes, gyrokinetic simulations have linked a substantial ion-
scale turbulence stabilization to the presence of supra-thermal particles, capturing …

Multi-scale interactions between turbulence and magnetohydrodynamic instability driven by energetic particles

A Ishizawa, K Imadera, Y Nakamura… - Nuclear Fusion, 2021 - iopscience.iop.org
In order to realize high performance burning plasmas in magnetic-confinement fusion
devices, such as tokamaks, both bulk plasma transport and that of energetic fusion alpha …

Physics design point of high-field stellarator reactors

JA Alonso, I Calvo, D Carralero, JL Velasco… - Nuclear …, 2022 - iopscience.iop.org
The ongoing development of electromagnets based on high temperature superconductors
has led to the conceptual exploration of high-magnetic-field fusion reactors of the tokamak …