L. Delpech
A5087248648- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
- Nuclear Materials and Properties
- Plasma Diagnostics and Applications
- Nuclear reactor physics and engineering
- Pulsed Power Technology Applications
- Silicon Carbide Semiconductor Technologies
- Particle Detector Development and Performance
- Electromagnetic Launch and Propulsion Technology
- Laser Design and Applications
- Smart Grid Security and Resilience
- Sensorless Control of Electric Motors
- Solar and Space Plasma Dynamics
- Physics of Superconductivity and Magnetism
- Microwave Dielectric Ceramics Synthesis
- Advanced Data Storage Technologies
- Electromagnetic Simulation and Numerical Methods
- Electromagnetic Compatibility and Noise Suppression
- Geophysics and Sensor Technology
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2023
CEA Cadarache
2013-2023
Institut de Recherche sur la Fusion par Confinement Magnétique
2014-2022
Institute of Plasma Physics
2011-2022
Chinese Academy of Sciences
2011-2022
Southwestern Institute of Physics
2011-2020
Southwest Jiaotong University
2020
Atomic Energy (Canada)
2020
Tsinghua University
2017
DSM (Netherlands)
2012
With WEST (Tungsten Environment in Steady State Tokamak) (Bucalossi et al 2014 Fusion Eng. Des. 89 907–12), the Tore Supra facility and team expertise (Dumont Plasma Phys. Control. 56 075020) is used to pave way towards ITER divertor procurement operation. It consists implementing a configuration installing ITER-like actively cooled tungsten monoblocks tokamak, taking full benefit of its unique long-pulse capability. user platform, open all partners. This paper describes physics basis WEST:...
Abstract WEST is an MA class superconducting, actively cooled, full tungsten (W) tokamak, designed to operate in long pulses up 1000 s. In support of ITER operation and DEMO conceptual activities, key missions are: (i) qualification high heat flux plasma-facing components integrating both technological physics aspects relevant particle exhaust conditions, particularly for the monoblocks foreseen divertor; (ii) integrated steady-state at confinement, with a focus on power issues. During phase...
A 20 MW/5 GHz lower hybrid current drive (LHCD) system was initially due to be commissioned and used for the second mission of ITER, i.e. Q = 5 steady state target. Though not part currently planned procurement phase, it is now under consideration an earlier delivery. In this paper, both physics technology conceptual designs are reviewed. Furthermore, appropriate work plan also developed. This design, R&D, installation a MW LHCD on ITER follows Scientific Technical Advisory Committee...
Abstract Since the last IAEA Fusion Energy Conference in 2018, significant progress of experimental program HL-2A has been achieved on developing advanced plasma physics, edge localized mode (ELM) control physics and technology. Optimization confinement performed. In particular, high- β N H-mode plasmas exhibiting an internal transport barrier have obtained (normalized pressure reached up to 3). Injection impurity improved confinement. ELM using resonance magnetic perturbation or injection a...
Abstract ITER will operate with a tungsten divertor, material featuring surface morphology changes when exposed to helium plasmas, in particular the formation of so called fuzz under specific conditions. Investigating interactions between plasma facing components and plasmas tokamak environment is therefore key point consolidate predictions for divertor performance lifetime. To this end, dedicated campaign was performed full WEST tokamak, cumulating ∼2000 s repetitive L mode discharges. It...
Since the first H-mode discharges in 2010, duration of state has been extended and a significantly wider operational window plasma parameters attained. Using second neutral beam (NB) source improved tuning equilibrium configuration with real-time control, stored energy Wtot ∼ 450 kJ achieved corresponding confinement time τE 163 ms. Recent discharges, produced fall 2012, have reached βN up to 2.9 surpassed n = 1 ideal no-wall stability limit computed for pressure profiles, which is one key...
A new ITER-relevant lower hybrid current drive (LHCD) launcher, based on the passive-active-multijunction (PAM) concept, was brought into operation Tore Supra tokamak in autumn 2009. The PAM launcher concept designed view of ITER to allow efficient cooling waveguides, as required for long pulse operation. In addition, it offers low power reflection close cut-off density, which is very attractive ITER, where large distance between plasma and wall may bring density front values. first...
The mission of HL-2A is to explore the key physical topics relevant ITER and advanced tokamak operation (e.g. future HL-2M), such as access H-mode, energetic particle physics, edge-localized mode (ELM) mitigation/suppression disruption mitigation. Since 2016 Fusion Energy Conference, team has focused on investigations following areas: (i) pedestal dynamics L–H transition, (ii) techniques ELM control, (iii) turbulence transport, (iv) physics. results demonstrated that increase mean shear flow...
Abstract The consequences of tungsten (W) melting on divertor lifetime and plasma operation are high priority issues for ITER. Sustained controlled W-melting experiment has been achieved the first time in WEST a poloidal sharp leading edge an actively cooled ITER-like facing unit (PFU). A series dedicated power steady state discharges were performed to reach point tungsten. was exposed parallel heat flux about 100 MW.m −2 up 5 s providing melt phase 2 without noticeable impact (radiated...
Since the last Fusion Energy Conference, significant progress has been made in following areas. The first high coupling efficiency low-hybrid current drive (LHCD) with a passive–active multi-junction (PAM) antenna was successfully demonstrated H-mode on HL-2A tokamak. Double critical impurity gradients of electromagnetic turbulence were observed plasmas. Various ELM mitigation techniques have investigated, including supersonic molecular beam injection (SMBI), seeding, resonant magnetic...
Lower hybrid current drive (LHCD) experiments with line-averaged density varying between 1.5 × 1019 and 6 m−3 are performed on the Tore Supra tokamak under quasi-steady-state conditions respect to fast electron dynamics. The LHCD efficiency is analysed from bremsstrahlung (FEB) cyclotron emission (ECE). effect of plasma equilibrium particle fuelling documented. It concluded that decay FEB could be consistent simple scaling FEB. Plasma edge measurements presented looking for emission. In a...
A new concept of lower hybrid antenna for current drive has been proposed ITER (Bibet et al 1995 Nucl. Fusion 35 1213–23 ): the passive active multijunction (PAM) that relies on a periodic combination and waveguides. An actively cooled PAM at 3.7 GHz recently installed tokamak Tore Supra. This paper summarizes comprehensive experimental characterization coupling properties to Supra plasmas. In this paper, electromagnetic are measured reduced power (<1 MW) allow systematic comparison with...
Abstract The mission of WEST (tungsten-W Environment in Steady-state Tokamak) is to explore long pulse operation a full tungsten (W) environment for preparing next-step fusion devices (ITER and DEMO) with focus on testing the ITER actively cooled W divertor tokamak conditions. Following successful completion phase 1 (2016-2021), 2 started December 2022 lower made entirely ITER-grade mono-blocks. A boronization prior first plasma attempt allowed smooth startup new divertor. Despite reduced...
Good coupling of lower hybrid (LH) waves has been demonstrated in different H-mode scenarios JET, at high triangularity (δ ∼ 0.4) and large distance between the last closed flux surface LH launcher (up to 15 cm). Local gas injection D2 region magnetically connected is used for increasing local density scrape-off layer (SOL). Reciprocating Langmuir probe measurements indicate that electron profile flattens far SOL during power application. Some degradation normalized confinement, as given by...
The main results of the Tore Supra experimental programme in years 2007–2008 are reported. They document significant progress achieved domain steady-state tokamak research, as well more general issues relevant for ITER and fusion physics research. Three areas covered: technology developments tests a real machine environment, operational high power long pulses, plasma physics. Results presented this paper include test validation new, load-resilient concept ion cycotron resonance heating...
Abstract 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 achieved allowing extend plasma duration 53 s stationary conditions particular respect contamination. Transitions H mode are observed, H-modes lasting 4 obtained. The increase stored energy is weak since crossing separatrix close L–H threshold. Hot L plasmas (central temperature exceeding 3 keV) a confinement time following ITER L96 scaling...
Edge localized mode (ELM) mitigation with lower hybrid current drive (LHCD) has been observed in the HL-2A tokamak. This effect is very sensitive to parameters as plasma density and LHCD absorbed power, i.e., more easily be for high large power. The divertor peak heat load released by ELM significantly reduced during phase. pedestal gradient slightly mitigation, rotation velocity ion temperature are LHCD. It found that not synchronized LHCD, while it increase of turbulence, showing...
Physics related to fast electrons in lower hybrid (LH) current drive (LHCD) plasma is a very important issue, since these particles will play an role runaway electron (RE) generation and wave (LHW)-related physics. Utilizing new hard X-ray (HXR) pinhole camera, recent HL-2A tokamak experiments have devoted enhancing the understanding of physics on LHW. The bremsstrahlung (FEB) emission HXR energy range between 20 200 keV was measured by camera. To study conversion LHW-produced into REs,...