Explanipedia

Precise Regularized Minimax Regret With Unbounded Weights Open

Michael Drmota, Philippe Jacquet, Changlong Wu, Wojciech Szpankowski · 2025

International audience

BUBBLE-BLUE a multihop private network based on Bluetooth Open

Nadjib Achir, Philippe Jacquet · 2025

The BUBBLE-BLUE (BB) project aims to create private Bluetooth bubbles on top of smartphones and to create a kind of terrestrial STARLINK network based on users smartphones.. In each private bubble, participants will be able to communicate …

Long pulse H-mode operation in JET-ITER like wall Open

E. Lerche, D. King, X. Litaudon, S. Brezinsek, E. Joffrin , et al. · 2025

In the last experimental campaign of the JET tokamak in December 2023, long duration discharges in deuterium plasmas were performed to assess the sustainment of the plasma performance over many resistive time scales and to address plasma-w…

Operational challenges for long pulses on JET-ILW Open

D. King, E. Lerche, X. Litaudon, S. Brezinsek, E. Joffrin , et al. · 2025

The typical pulse on the JET tokamak is ∼10 s during the main phase of the discharge, however long discharge operation (>30 s) is possible with sufficient preparation and care. During the last period of JET operation in 2023 long pulses in…

Assessment of the JET ICRH system performance since 2000 Open

I. Monakhov, Philippe Jacquet, P. Dumortier, F. Durodié, E. Lerche , et al. · 2024

The paper provides an assessment of the ion-cyclotron resonance heating (ICRH) system performance on JET since the year 2000. The vast amount of collected data offer an insight into the historical challenges and trends in the ICRH system p…

X-point radiator control and its dynamics in ASDEX Upgrade and JET deuterium–tritium discharges Open

T.O.S.J. Bosman, M. Bernert, Lennard Ceelen, B. Sieglin, J.T.W. Koenders , et al. · 2024

Control of heat exhaust is essential for the operation of power producing fusion reactors. Here, we present results of heat exhaust feedback control experiments in JET and AUG. In JET, we demonstrate the first X-point radiator (XPR) contro…

Fitting indicator for AI generative models Open

Philippe Jacquet · 2024

One of the key issues in machine learning is the characterization of the learnability of a problem. In some cases the learning is under-fitting, in other cases the learning is over-fitting. In both cases the dedicated generative AI may fai…

Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration Open

J. Harrison, A. Aboutaleb, Sajidah Ahmed, M. Aljunid, S. Allan , et al. · 2024

Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The imp…

First production of X-rays at the ThomX high-intensity Compton source Open

M. Jacquet, Patrick Alexandre, Muath Alkadi, M.A. Alves, Manar Amer , et al. · 2024

Depth-First Search Performance in a Random Digraph with Geometric Outdegree Distribution Open

Philippe Jacquet, Svante Janson · 2024

Retro-information implies quantum unitary violation Open

Philippe Jacquet, Véronique Joly · 2024

We prove simple theorems around the impossibility of sending information backward in time without the violation of the principle of quantum unitarity in physics. The result also extends to faster than light information transfer. The theore…

Changeover between helium and hydrogen fueled plasmas in JET and WEST Open

T. Wauters, R. Bisson, E. Delabie, D. Douai, A. Gallo , et al. · 2024

International audience

LIPIcs, Volume 302, AofA 2024, Complete Volume Open

Philippe Jacquet, Svante Janson · 2024

LIPIcs, Volume 302, AofA 2024, Complete Volume

Tritium removal from JET-ILW after T and D–T experimental campaigns Open

D. Matveev, D. Douai, T. Wauters, A. Widdowson, I. Jepu , et al. · 2023

After the second Deuterium–Tritium Campaign (DTE2) in the JET tokamak with the ITER-Like Wall (ILW) and full tritium campaigns that preceded and followed after the DTE2, a sequence of fuel recovery methods was applied to promote tritium re…

L-H transition studies in tritium and deuterium–tritium campaigns at JET with Be wall and W divertor Open

E.R. Solano, G. Birkenmeier, C. Silva, E. Delabie, J.C. Hillesheim , et al. · 2023

The recent deuterium–tritium campaign in JET-ILW (DTE2) has provided a unique opportunity to study the isotope dependence of the L-H power threshold in an ITER-like wall environment (Be wall and W divertor). Here we present results from de…

The JET hybrid scenario in Deuterium, Tritium and Deuterium-Tritium Open

J. Hobirk, C. Challis, A. Kappatou, E. Lerche, D. Keeling , et al. · 2023

The JET hybrid scenario has been developed from low plasma current carbon wall discharges to the record-breaking Deuterium-Tritium plasmas obtained in 2021 with the ITER-like Be/W wall. The development started in pure Deuterium with refine…

Experiments in high-performance JET plasmas in preparation of second harmonic ICRF heating of tritium in ITER Open

M. Mantsinen, Philippe Jacquet, E. Lerche, D. Gallart, K. Kirov , et al. · 2023

The reference ion cyclotron resonance frequency (ICRF) heating schemes for ITER deuterium–tritium (D-T) plasmas at the full magnetic field of 5.3 T are second harmonic heating of T and 3 He minority heating. The wave-particle resonance loc…

Blockchain Adapted to IoT via Green Mining and Fractal Proof of Work Open

Philippe Jacquet · 2023

International audience

Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET Open

Yu.V. Kovtun, T. Wauters, D. Matveev, R. Bisson, I. Jepu , et al. · 2023

The role of isotope mass and transport for H-mode access in tritium containing plasmas at JET with ITER-like wall Open

G. Birkenmeier, E.R. Solano, I.S. Carvalho, J. C. Hillesheim, E. Delabie , et al. · 2023

The required heating power, , to access the high confinement regime (H-mode) in tritium containing plasmas is investigated in JET with ITER-like wall at a toroidal magnetic field of T and a plasma current of MA. …

Is Quantum Tomography a Difficult Problem for Machine Learning? Open

Philippe Jacquet · 2023

One of the key issues in machine learning is the characterization of the learnability of a problem. Regret is a way to quantify learnability. Quantum tomography is a special case of machine learning where the training set is a set of quant…

ICRH operations and experiments during the JET-ILW tritium and DTE2 campaigns Open

Philippe Jacquet, E. Lerche, M. Mantsinen, D. Van Eester, K. Kirov , et al. · 2023

2021 has culminated with the completion of the JET-ILW DTE2 experimental campaign. This contribution summarizes Ion Cyclotron Resonance Heating (ICRH) operations from system and physics point of view. Improvements to the (ICRH) system, to …

Unitarity Excess in Schwartzschild Metric Open

Philippe Jacquet, Véronique Joly · 2023

Depth-First Search performance in a random digraph with geometric outdegree distribution Open

Philippe Jacquet, Svante Janson · 2022

We present an analysis of the depth-first search algorithm in a random digraph model with independent outdegrees having a geometric distribution. The results include asymptotic results for the depth profile of vertices, the height (maximum…

Connecting flying backhauls of unmanned aerial vehicles to enhance vehicular networks with fixed 5G NR infrastructure Open

Dalia Popescu, Philippe Jacquet, Bernard Mans · 2022

This paper investigates moving networks of Unmanned Aerial Vehicles to extend connectivity and guarantee data rates in the 5G by analysing possible hovering locations based on limitations such as flight time and coverage. The authors provi…

Variations on depth-first search performance in random digraphs Open

Philippe Jacquet, Svante Janson · 2022

International audience

Role of NBI fuelling in contributing to density peaking between the ICRH and NBI identity plasmas on JET Open

T. Tala, F. Eriksson, P. Mantica, A. Mariani, Anna Salmi , et al. · 2022

Density peaking has been studied between an ICRH and NBI identity plasma in JET. The comparison shows that 8 MW of NBI heating/fueling increases the density peaking by a factor of two, being R / L n = 0.45 for the ICRH pulse and R / L n = …

Recent progress in L–H transition studies at JET: tritium, helium, hydrogen and deuterium Open

E.R. Solano, E. Delabie, G. Birkenmeier, C. Silva, J. C. Hillesheim , et al. · 2022

We present an overview of results from a series of L–H transition experiments undertaken at JET since the installation of the ITER-like-wall (JET-ILW), with beryllium wall tiles and a tungsten divertor. Tritium, helium and deuterium plasma…

L–H transition threshold studies in helium plasmas at JET Open

E.R. Solano, G. Birkenmeier, E. Delabie, C. Silva, J. C. Hillesheim , et al. · 2021

We present a study of the power threshold for L-H transitions (P-LH) in almost pure helium plasmas, obtained in recent experiments at JET with an ITER-like wall (Be wall and W divertor). The most notable new result is that the density at w…

Simultaneous H/D/T and 3He/4He absolute concentration measurements with an optical Penning gauge on JET Open

S. Vartanian, Ephrem Delabie, C. C. Klepper, I. Jepu, Philippe Jacquet , et al. · 2021

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