Explanipedia

Parametric analysis of the TWA launcher for WEST using minority heating ICRH technique Open

L. Hijazi, J. Hillairet, R. Dümont, V. Maquet, R. Ragona · 2025

This paper presents a parametric analysis of the conceptual design of the Travelling Wave Array (TWA) launcher for the WEST tokamak. Simulations were made using the EVE code to identify the optimal wavenumbers and frequencies for WEST stan…

Integrated modeling of RF-induced tungsten erosion at ICRH antenna structures in the WEST tokamak* Open

Atul Kumar, W. Tierens, Tim Younkin, Curtis A. Johnson, C. C. Klepper , et al. · 2025

This paper introduces STRIPE (Simulated Transport of RF Impurity Production and Emission), an advanced modeling framework developed to analyze material erosion and the global transport of eroded impurities originating from radio-frequency …

Machine learning enhanced predictions of ICRF heating: Overcoming numerical limitations via data curation Open

Álvaro Sánchez-Villar, Zhe Bai, N. Bertelli, E. Wes Bethel, J. Hillairet , et al. · 2025

In this work, we present the development of robust surrogate models for Ion Cyclotron Range of Frequencies (ICRF) and High-Harmonic Fast Wave (HHFW) heating predictions in fusion plasmas. Building upon our previous efforts to achieve real-…

Status of the radiofrequency modelling of the WEST Ion Cyclotron Travelling Wave Array launcher Open

R. Ragona, V. Maquet, J. Hillairet · 2025

Tungsten control in long pulse operation: feedback from WEST to ITER Open

P. Maget, P. Manas, Jeniffer Paola Arias Morales, K. Afonin, C. Bourdelle , et al. · 2025

The full W environment that is now foreseen for ITER puts strong emphasis on experimental results obtained in present devices in similar conditions. In this context, the WEST tokamak is well equipped to bring key contributions to the prepa…

Numerical assessment of ICRF-specific plasma-wall interaction in the new ITER baseline using the SSWICH-SW code Open

L. Colas, W. Helou, G. Urbanczyk, V. Bobkov, F. Calarco , et al. · 2024

Radiofrequency sheath rectification on WEST: application of the sheath-equivalent dielectric layer technique in tokamak geometry* Open

W. Tierens, Atul Kumar, C. C. Klepper, J. Lore, J. R. Myra , et al. · 2024

Radiofrequency sheath rectification is a phenomenon relevant to the operation of Ion Cyclotron Range of Frequencies (ICRFs) actuators in tokamaks. Techniques to model the sheath rectification on 3D ICRF antenna geometries have only recentl…

Wall conditions in WEST during operations with a new ITER grade, actively cooled divertor Open

A. Gallo, P. Moreau, D. Douai, Tomás Alarcón, K. Afonin , et al. · 2024

Future fusion reactors like ITER and DEMO will have all-tungsten (W) walls and long pulses. These features will make wall conditioning more difficult than in most of the existing devices. The W Environment Steady-state Tokamak (WEST) is on…

Real-time capable modeling of ICRF heating on NSTX and WEST via machine learning approaches Open

Álvaro Sánchez-Villar, Zhe Bai, N. Bertelli, E. W. Bethel, J. Hillairet , et al. · 2024

A real-time capable core Ion Cyclotron Range of Frequencies (ICRF) heating model on NSTX and WEST is developed. The model is based on two nonlinear regression algorithms, the random forest ensemble of decision trees and the multilayer perc…

Mesures du multipactor en régime stationnaire et progressif Open

Adrien Plaçais, Eva Al Hajj Sleiman, J. Angot, Nicolas Faure, Yolanda Gómez Martínez , et al. · 2024

Les textes des communications seront regroupés dans des actes dont une version électronique sera disponible sur le site d’URSI-France (http://ursi-france.org). Une sélection de communications sera proposée pour publication étendue, dans un…

Multipactor Thresholds Prediction for Geometries Subject to Standing Waves Open

Eva Al Hajj Sleiman, J. Hillairet, Mohamed Belhaj · 2024

International audience

Design and analysis of a PAM launcher at 4.6 GHz for a new LHCD system on EAST Open

Miaohui Li, L. Liu, Yongheng Yang, L.M. Zhao, W.D. Ma , et al. · 2024

To improve the Current Drive (CD) capability in long-pulse (up to ∼1000 s) H-mode operation, it has been decided to develop a new Lower Hybrid Current Drive system at 4.6 GHz with an active cooling Passive Active Multijunction (PAM) launch…

Data for 'Real-time capable modeling of ICRF heating on NSTX and WEST via machine learning approaches' Open

Álvaro Sánchez-Villar, Zhe Bai, N. Bertelli, E. Wes Bethel, J. Hillairet , et al. · 2024

Tungsten accumulation during ion cyclotron resonance heating operation on WEST Open

P. Maget, P. Manas, R. Dümont, C. Angioni, J.F. Artaud , et al. · 2023

The observation of radiative collapses during ion cyclotron resonance heating (ICRH) operation on the full tungsten WEST tokamak constitutes a unique opportunity to get a quantitative balance of the sources and sinks in the core region of …

Multipactor predictions for ion cyclotron resonance heating antennas of the tokamak WEST * Open

Eva Al Hajj Sleiman, J. Hillairet, Mohamed Belhaj, S. Dadouch, V. Maquet · 2023

During the plasma experimental campaigns performed on the tokamak WEST, a performance-limiting observation has been made on the Ion Cyclotron Resonance Heating (ICRH) system composed of three identical antennas. When only one antenna is po…

Minimization of the edge modes and near fields of a travelling wave array antenna for WEST Open

V. Maquet, R. Ragona, F. Durodié, J. Hillairet, D. Milanesio · 2023

The travelling wave array (TWA) antenna has been proposed as a promising alternative for ion cyclotron resonant heating in future fusion reactors. In this study, the possibility to make a TWA compatible with a tungsten environment like the…

First experimental results of the PAM LHCD launcher at 2.45 GHz on EAST Open

Miaohui Li, L. Liu, Meng Wang, Yaqing Yang, Cong-Feng Wu , et al. · 2023

This paper presents the first results of a passive active multijunction (PAM) launcher at 2.45 GHz during the lower hybrid current drive (LHCD) experiments on EAST. Good coupling performance with a power reflection coefficient ( RC ) ∼3% h…

Multipactor-Triggering Powers’ Modelling of a WEST ICRH Antenna During RF Conditioning Open

Eva Al Hajj Sleiman, J. Hillairet, Mohamed Belhaj · 2023

International audience

Review on recent progress in ion cyclotron range of frequency systems, experiments and modelling for magnetic confinement fusion Open

J. Hillairet · 2023

Conceptual design of the LHCD system on CFETR Open

L. Liu, Yong Yang, Miaohui Li, L.M. Zhao, Wendong Ma , et al. · 2023

Pre-conceptual studies of a travelling wave array antenna for the EAST Open

J. Li, R. Ragona, J. Hillairet, W. Zhang, Zhaoxi Chen , et al. · 2023

One of the primary problems of ion cyclotron range of frequency (ICRF) systems in magnetic confinement experiments is the coupling of a large amount of radio frequency wave power through the plasma cut-off layer within the voltage limits o…

Operational domain for the new 3MW/1000s ECRH System on WEST Open

T. Fonghetti, R. Dümont, G. Giruzzi, J.F. Artaud, Jean‐Michel Bernard , et al. · 2023

The ECRH system formerly used in Tore Supra is being upgraded to start on WEST in 2023, at a power level of 1MW and frequency of 105 GHz. Its ultimate 3MW/1000s capability is expected to enlarge the WEST operational domain by increasing ma…

Magnetic potential based formulation for linear and non-linear 3D RF sheath simulation Open

S. Shiraiwa, N. Bertelli, W. Tierens, R. Bilato, J. Hillairet , et al. · 2022

This paper reports a new numerical scheme to simulate the radio-frequency (RF) induced RF sheath, which is suitable for a large 3D simulation. In the RF sheath boundary model, the tangential component of the electric field ( ) is give…

Evaluation of multipactor thresholds for coaxial lines subject to surface conditioning for the WEST ion cyclotron antenna Open

Eva Al Hajj Sleiman, J. Hillairet, Mohamed Belhaj, S. Dadouch · 2022

Experimental and numerical study of the effect of dc electric field on the multipactor discharge threshold of Parallel-Plate Waveguide Open

Mohamed Belhaj, Adrien Plaçais, Juan-Antonio Duran-Venegas, Julien Youssefi, J. Sinigaglia , et al. · 2022

International audience

Developing high performance RF heating scenarios on the WEST tokamak Open

M. Goniche, V. Ostuni, C. Bourdelle, P. Maget, J.F. Artaud , et al. · 2022

High power experiments, up to 9.2 MW with LHCD and ICRH, have been carried out in the full tungsten tokamak WEST. Quasi non inductive discharges have been achieved allowing to extend the plasma duration to 53 s with stationary conditions i…

Improvement of lower hybrid current drive systems for high-power and long-pulse operation on EAST Open

Mao Wang, L. Liu, L.M. Zhao, Miaohui Li, W.D. Ma , et al. · 2022

International audience

A numerical and theoretical study of the multipactor appearance in the presence of a DC parallel electric field Open

Adrien Plaçais, J. Hillairet, Mohamed Belhaj, J. Puech · 2022

In this paper, we study the appearance of the multipactor in a simple system with a bottom plate holding a static potential Vd. We developed a numerical model to compute the evolution of the multipactor threshold as a function of the poten…

Developing high performance RF heating scenarios on the WEST tokamak Open

M. Goniche, V. Ostuni, C. Bourdelle, P. Maget, J.F. Artaud , et al. · 2022

High power experiments, up to 9.2 MW with LHCD and ICRH, have been carried out in the full tungsten tokamak WEST. Quasi non inductive discharges have been achieved allowing to extend the plasma duration to 53s with stationary conditions in…

Evaluation of Multipactor Thresholds for Coaxial Lines Subject To Surface Conditioning for the West Ion Cyclotron Antenna Open

Eva Al Hajj Sleiman, J. Hillairet, Mohamed Belhaj, S. Dadouch · 2022

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