A5075763454- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Ecology and Conservation Studies
- Gyrotron and Vacuum Electronics Research
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Electron and X-Ray Spectroscopy Techniques
- Research Data Management Practices
- Terahertz technology and applications
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Electric Motor Design and Analysis
- Microwave Imaging and Scattering Analysis
- Laser-induced spectroscopy and plasma
- Advanced Data Storage Technologies
- Photonic and Optical Devices
- Medical Research and Treatments
- Pulsed Power Technology Applications
- Nuclear reactor physics and engineering
École Polytechnique Fédérale de Lausanne
2016-2025
University Hospital Augsburg
2024-2025
CEA Cadarache
2009-2024
University of Augsburg
2024
Paul Pascal Research Center
2023-2024
National Centre for Nuclear Research
2021
Plasma Technology (United States)
2003-2020
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2007-2016
Institut de Recherche sur la Fusion par Confinement Magnétique
2010-2015
Chalmers University of Technology
2015
CRONOS is a suite of numerical codes for the predictive/interpretative simulation full tokamak discharge. It integrates, in modular structure, 1D transport solver with general 2D magnetic equilibria, several heat, particle and impurities models, as well momentum sources. This paper gives first comprehensive description suite: overall structure code, main available details on workflow implementation. Some examples applications to analysis experimental discharges predictions ITER scenarios are...
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:...
METIS is a numerical code aiming at fast full tokamak plasma analyses and predictions. It combines 0D scaling-law normalised heat particle transport with 1D current diffusion modelling 2D equilibria. contains several heat, impurities models, as well particle, momentum sources, which allow faster than real time scenario simulations. This paper gives first comprehensive description of the suite: overall structure code, main available details on simulation workflow implementation. Some examples...
Abstract The tokamak à configuration variable (TCV) continues to leverage its unique shaping capabilities, flexible heating systems and modern control system address critical issues in preparation for ITER a fusion power plant. For the 2019–20 campaign configurational flexibility has been enhanced with installation of removable divertor gas baffles, diagnostic capabilities an extensive set upgrades new dual frequency gyrotrons. baffles reduce coupling between main chamber allow detailed...
Abstract This paper discusses the development of a benign termination scenario for runaway electron (RE) beams on ASDEX Upgrade and TCV. A systematic study revealed that low density ( n e ) companion plasma was required to achieve large MHD instability, which expelled confined REs over wetted area allowed conversion magnetic energy radiation. Control achieved via neutral pressure regulation agnostic material injection method. The recombination found be dependent impurity species, quantity RE...
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...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text J. A. Decker, "Experimental Realization of the Multiplex Advantage a Hadamard-Transform Spectrometer," Appl. Opt. 10, 510-514 (1971) Export BibTex Endnote (RIS) HTML Plain alert Save article
Disruptions are a major operational concern for next generation tokamaks, including ITER.They may generate excessive heat loads on plasma facing components, large electromagnetic forces in the machine structures and several MA of multi-MeV runaway electrons.A more complete understanding processes methods to suppress them is necessary ensure safe reliable operation future tokamaks.Runaway electrons were studied at JET-ILW showing that their dependencies (accelerating electric field, avalanche...
In this Letter we investigate factors that influence the effective critical electric field for runaway-electron generation in plasmas. We present numerical solutions of kinetic equation and discuss implications threshold field. show necessary significant formation often is higher than previously calculated due to both (1) extremely strong dependence primary on temperature (2) synchrotron radiation losses. also address context a transition from runaway growth decay. find agreement with recent...
Purpose: The aim of this study was to evaluate the radiation dose, image quality, and potential virtual monoenergetic imaging (VMI) reconstructions high-pitch computed tomography angiography (CTA) thoracoabdominal aorta on a dual-source photon-counting detector–CT (PCD-CT) in comparison with an energy-integrating (EID-CT), special focus low-contrast attenuation. Methods: Consecutive patients being referred for electrocardiogram (ECG)-gated, CTA prior transcatheter aortic valve replacement...
The role played by electron density fluctuations near the plasma edge on rf current drive in tokamaks is assessed quantitatively. For this purpose, a general framework for incorporating existing modelling tools has been developed. It valid when power absorption takes place far from fluctuating region of plasma. ray-tracing formalism modified order to take into account time-dependent perturbations density, while Fokker–Planck solver remains unchanged. evolution distribution function time and...
A new ray-tracing code named C3PO has been developed to study the propagation of arbitrary electromagnetic radio-frequency (rf) waves in magnetized toroidal plasmas. Its structure is designed for maximum flexibility regarding choice coordinate system and dielectric model. The versatility this makes it particularly suitable integrated modeling systems. Using a that reflects nested magnetic flux surfaces tokamaks, fast accurate calculations inside plasma separatrix can be performed using...
A detailed study of lower hybrid current drive (LHCD) in ITER is provided, focusing on the wave propagation and mechanisms. combination ray-tracing Fokker–Planck calculations are presented for various plasma scenarios, frequency polarization. The dependence driven location power deposition upon coupled spectrum systematically determined, order to set objectives antenna design. respective effects finite-power levels, magnetic trapping, spectra accounted quantitatively estimated. sensitivity...
The TCV tokamak is augmenting its unique historical capabilities (strong shaping, strong electron heating) with ion heating, additional heating compatible high densities, and variable divertor geometry, in a multifaceted upgrade program designed to broaden operational range without sacrificing fundamental flexibility. rooted three-pronged approach aimed at ITER support, explorations towards DEMO, research. A 1 MW, tangential neutral beam injector (NBI) was recently installed promptly...
A 4.6 GHz lower-hybrid current drive (LHCD) system has been firstly commissioned in EAST the 2014 campaign. The first LHCD results with show that LHW can be coupled to plasma a low reflection coefficient, and rotation, modify profile, heat effectively. By means of configuration optimization local gas puffing near antenna, good LHW–plasma coupling coefficient less than 5% is obtained. maximum power up 3.5 MW. (CD) efficiency 1.1 × 1019 m−2 W−1 central electron temperature above 4 keV,...
Runaway electrons are generated in a magnetized plasma when the parallel electric field exceeds critical value. For such with energies typically reaching tens of MeV, Abraham–Lorentz–Dirac (ALD) radiation force, reaction to synchrotron emission, is significant and can be dominant process limiting electron acceleration. The effect ALD force on runaway dynamics homogeneous investigated using relativistic finite-difference Fokker–Planck codes LUKE (Decker Peysson 2004 Report EUR-CEA-FC-1736,...
Abstract The research program of the TCV tokamak ranges from conventional to advanced-tokamak scenarios and alternative divertor configurations, exploratory plasmas driven by theoretical insight, exploiting device’s unique shaping capabilities. Disruption avoidance real-time locked mode prevention or unlocking with electron-cyclotron resonance heating (ECRH) was thoroughly documented, using magnetic radiation triggers. Runaway generation high- Z noble-gas injection runaway dissipation...
Abstract We present a model for the particle balance in post-disruption runaway electron plateau phase of tokamak discharge. The is constructed with help of, and applied to, experimental data from TCV discharges investigating so-called ``low-Z benign termination'' mitigation scheme. In termination scheme, free density first reduced order subsequently induced MHD instability to grow rapidly spread electrons widely across wall. show that observed non-monotonic dependence measured neutral...
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...
Aimed at high-confinement (H-mode) plasmas in the Experimental Advanced Superconducting Tokamak (EAST), effect of local gas puffing from electron and ion sides a lower hybrid wave (LHW) antenna on LHW–plasma coupling high-density experiments with current drive (LHCD) are investigated EAST. results show that side is more favourable to improve compared side. Investigations indicate without affected by density near LHW grill (grill density), hence leading multi-transition low–high–low (L–H–L)...
We point out the applicability of optical Hadamard-transform coding to detector-noise-limited image scanning and give approximate signal-to-noise ratio gains over conventional point-by-point for several whole-image multiplex schemes.
Runaway electrons can be generated in tokamak plasmas if the accelerating force from toroidal electric field exceeds collisional drag owing to Coulomb collisions with background plasma. In ITER, disruptions are expected generate runaway mainly through knock-on (Hender et al 2007 Nucl. Fusion 47 S128–202), where enough momentum transferred existing runaways slow transport latter beyond a critical momentum, setting off an avalanche of electrons. Since usually scattered significant...