B. López-Miranda

The influence of NBI-driven plasma current on ablation light profiles of cryogenic pellets injected into the stellarator TJ-II

K. J. McCarthy, I. Garcı́a-Cortés, B. Ph. van Milligen, A. Baciero et autres

Abstract Efficient plasma core fuelling is critical for magnetic confinement fusion (MCF). The envisaged technology is cryogenic pellet injection where small cylinders of fuel ice are injected at high speed into the confined plasma. Indeed, injectors are operated currently on many tokamak …

us, es (code pays fourni par la source)

Data-Driven estimation of experimental signals in TJ-II: A proof of principle

Andrés Cureño Ramírez, Luis Gerardo de la Fraga, G.A. Rattá, A. González Ganzábal et autres

Magnetic confinement fusion experiments operate with extensive diagnostic coverage and high per-shot costs. Although machine operation is guided primarily by expert knowledge, theoretical understanding and decades of experimental experience, many aspects of scenario development still require exploring actuator trajectories whose consequences are …

mx, es (code pays fourni par la source)

A data-driven approach to estimate plasma density in TJ-II stellarator

Paulo Aguayo, Gonzalo Farías, A. González Ganzábal, Ernesto Fábregas et autres

Magnetically confined fusion devices, such as the stellarator TJ-II, are highly complex infrastructures where plasma evolution is monitored through advanced diagnostic systems. Failures in these diagnostics can result in missing or unreliable data, compromising operational stability and experiment reliability. This work proposes …

cl, es (code pays fourni par la source)

A comprehensive database of TJ-II signals and diagnostics for statistically based models

A. González Ganzábal, G.A. Rattá, T. Estrada, José Martínez-Fernández et autres

Density profiles in stellarators: an overview of particle transport, fuelling and profile shaping studies at TJ-II

A. Alonso, D. Alegre, R. Antón, A. Arias-Camisón et autres

Abstract We provide an overview of activities carried out at the TJ-II stellarator for improving our understanding of- and developing plasma physics models for particle density profiles in stellarators. Namely, we report on recent progress in turbulent particle transport simulation, validation of …

es, gb, ua, bg, hu, us, jp, pt (code pays fourni par la source)

Multi-pellet injection into the NBI-heated phase of TJ-II plasmas

K. J. McCarthy, I. Garcı́a-Cortés, A. Alonso, A. Arias-Camisón et autres

Abstract A pellet-induced enhanced confinement (PiEC) phase, with general characteristics similar to those reported for the stellarator W7-X, is observed after single pellet injection (>10 19 H atoms) into the neutral beam injection heated phase of plasmas in the mid-sized heliac-type stellarator …

es, ua (code pays fourni par la source)

A lithium laser-ablation based time-of-flight (LILA-TOF) diagnostic for measuring plasma edge ion temperature and toroidal plasma rotation

B. López-Miranda, F.L. Tabarés, K. J. McCarthy, A. Baciero et autres

Abstract A new method for studying the thermalization and transport of injected impurities at the edge of hot plasma, (considering the last closed magnetic surface, the free path is between 1 and 2 cm approx.) under no perturbative conditions, is presented. In …

Overview of the TJ-II stellarator research programme towards model validation in fusion plasmas

C. Hidalgo, E. Ascasíbar, D. Alegre, A. Alonso et autres

Abstract TJ-II stellarator results on modelling and validation of plasma flow asymmetries due to on-surface potential variations, plasma fuelling physics, Alfvén eigenmodes (AEs) control and stability, the interplay between turbulence and neoclassical (NC) mechanisms and liquid metals are reported. Regarding the validation …

de, es, ua, ru, jp, hu, us, cn, pt, gb (code pays fourni par la source)

Spatial characterization of edge zonal flows in the TJ-II stellarator: the roles of plasma heating and isotope mass

U. Losada, T. Kobayashi, S. Ohshima, Á. Cappa et autres

Abstract In this article, we report the latest results for the impacts of the isotope mass and the plasma heating scenario on the spatiotemporal characteristics of the low-frequency zonal flow (ZF)-like electrostatic oscillation found in the plasma edge of the TJ-II stellarator. …

jp, cn, pt (code pays fourni par la source)

Numerical Considerations for Neutral Beam Spectroscopy Based Diagnostics in the Stellarator TJ-II

K. J. McCarthy, N. Panadero, B. López-Miranda

Overview of recent TJ-II stellarator results

E. Ascasíbar, Daniel Moreno Alba, D. Alegre, A. Alonso et autres

Abstract The main results obtained in the TJ-II stellarator in the last two years are reported. The most important topics investigated have been modelling and validation of impurity transport, validation of gyrokinetic simulations, turbulence characterisation, effect of magnetic configuration on transport, fuelling …

es, ua, ch, de, ru, it, us, cn, jp, gb (code pays fourni par la source)

Generation and transport of atomic lithium during the exposure of liquid metals to hot plasmas in TJ-II

F.L. Tabarés, E. Oyarzábal, D. Tafalla, A.B. Martín-Rojo et autres

A full campaign of comparative Li/LiSn/Sn testing has been initiated in TJ-II stellarator plasmas. Solid and liquid samples of the three candidates, in a Capillary Porous System (CPS) arrangement, have been exposed to the edge plasma and the associated perturbation on the …

es (code pays fourni par la source)