Macroscopic parameterization of positive streamer heads in airThe growth of streamer discharges is determined at their heads, for individual streamers as well as in collective phenomena, such as streamer trees or coronas or streamer bursts ahead of lightning…Dennis Bouwman, Jannis Teunissen, Ute Ebert·Sep 6, 2024SaveLearn
Infra-red thermographic inversion in ST40Infra-red (IR) thermography is an essential diagnostic tool for understanding the edge plasma behavior in fusion devices. In this work, we present a new in-house numerical tool, Functional Analysis…Matteo Moscheni, Erik Maartensson, Matthew Robinson et al.·Sep 6, 2024SaveLearn
Exploring the operational limits of poloidal and helical arrays of Mirnov coils in stellarators by means of a synthetic diagnosticA synthetic Mirnov coils diagnostic for non-axisymmetric magnetic configurations is presented and used to study the capabilities of the poloidal array of single-axis coils and the two helical arrays…P. Pons-Villalonga, A. Cappa, J. Martínez-Fernández et al.·Sep 6, 2024SaveLearn
Empirically extending 1D Child-Langmuir theory to a finite temperature beamNumerical solutions to the 1D steady-state Vlasov-Poisson system are used to develop a straightforward empirical formula for the electric current density transmitted through a vacuum diode (voltage…Jesse M. Snelling, Gregory R. Werner, John R. Cary·Sep 6, 2024SaveLearn
Spot size dependent shock wave, plume and ion expansion dynamics of laser produced YBCO plasmaThe expansion dynamics of laser produced plasma plumes in gaseous atmospheres exhibit information on plasma-ambient gas interactions which result in plume splitting, shock formation, sharpening and…S. C. Singh, C. Fallon, P. Yeates et al.·Sep 5, 2024SaveLearn
Formation of high-aspect-ratio nanocavity in LiF crystal using a femtosecond of x-ray FEL pulseSub-picosecond optical laser processing of metals is actively utilized for modification of a heated surface layer. But for deeper modification of different materials a laser in the hard x-ray range…Sergey S. Makarov, Sergey A. Grigoryev, Vasily V. Zhakhovsky et al.·Sep 5, 2024SaveLearn
Thermo-electron accumulation in light and heavy water during MHz-burst laser ablationLaser-induced water ablation triggers various physical effects, including atom ionization, optical breakdown of the liquid, phase explosion, cavitation, and shockwave propagation. These effects can…Denys Moskal, Jiri Martan, Vladislav Lang et al.·Sep 5, 2024SaveLearn
Biermann-battery driven magnetized collisionless shock precursors in laser produced plasmasThis letter reports the first complete observation of magnetized collisionless shock precursors formed through the compression of Biermann-battery magnetic fields in laser produced plasmas. At OMEGA,…Timothy Johnson, Graeme Sutcliffe, Jacob Pearcy et al.·Sep 4, 2024SaveLearn
Characterizing the negative triangularity reactor core operating space with integrated modelingNT experiments have demonstrated core performance on par with positive triangularity (PT) H-mode without edge-localized modes (ELMs), encouraging further study of an NT reactor core. In this work, we…H. S. Wilson, A. O. Nelson, J. McClenaghan et al.·Sep 4, 2024SaveLearn
Evolution of radiation profiles in a strongly baffled divertor on MAST UpgradePlasma detachment involves interactions of the plasma with impurities and neutral particles, leading to significant losses of plasma power, momentum, and particles. Accurate mapping of plasma…Fabio Federici, Matthew L. Reinke, Bruce Lipschultz et al.·Sep 4, 2024SaveLearn
Compression of high-power laser pulse leads to increase of electron acceleration efficiencyPropagation of ultrarelativistically intense laser pulse in a self-trapping mode in a near critical density plasma makes it possible to produce electron bunches of extreme parameters appropriate for…O. E. Vais, M. G. Lobok, V. Yu. Bychenkov·Sep 4, 2024SaveLearn
Achievement of highly radiating plasma in negative triangularity and effect of reactor-relevant seeded impurities on confinement and transportThe first achievement of highly radiating plasmas in negative triangularity is shown with an operational space featuring high core radiation at high Greenwald fraction obtained with the injection of…L. Casali, D. Eldon, T. Odstrcil et al.·Sep 4, 2024SaveLearn
Machine Learning Applications to Computational Plasma Physics and Reduced-Order Plasma Modeling: A PerspectiveMachine learning (ML) provides a broad spectrum of tools and architectures that enable the transformation of data from simulations and experiments into useful and explainable science, thereby…Farbod Faraji, Maryam Reza·Sep 4, 2024SaveLearn
Saturation of magnetised plasma turbulence by propagating zonal flowsStrongly driven ion-scale turbulence in tokamak plasmas is shown to be regulated by a new propagating zonal flow mode, the toroidal secondary mode, which is nonlinearly supported by the turbulence.…Richard Nies, Felix Parra, Michael Barnes et al.·Sep 3, 2024SaveLearn
Multiscale simulation of rarefied gas flows in Divertor Tokamak Test facilitySimulating gas flow within the divertor, which is a crucial component in nuclear fusion reactors, is essential for assessing and enhancing its design and performance. Traditional methods, such as the…Wei Li, Yanbing Zhang, Jianan Zeng et al.·Sep 3, 2024SaveLearn
Strain Optimization for ReBCO High-Temperature Superconducting Stellarator Coils in SIMSOPTThis work provides an optimization mechanism to ensure the compatibility of ReBCO (Rare-earth Barium Copper Oxide) high-temperature superconducting (HTS) tapes with non-planar stellarator coils.…Paul Huslage, Elisabeth J. Paul, Mohammed Haque. Pedro F. Gil et al.·Sep 3, 2024SaveLearn
Relaxation to universal non-Maxwellian equilibria in a collisionless plasmaGeneric equilibria are derived for turbulent relaxing plasmas via an entropy-maximization procedure that accounts for the short-time conservation of certain collisionless invariants. The conservation…Robert J. Ewart, Michael L. Nastac, Pablo J. Bilbao et al.·Sep 3, 2024SaveLearn
Including the vacuum energy in stellarator coil designBeing three-dimensional, stellarators have the advantage that plasma currents are not essential for creating rotational-transform; however, the external current-carrying coils in stellarators can…S. Guinchard, S. R. Hudson, E. J. Paul·Sep 2, 2024SaveLearn
Ionisation Calculations using Classical Molecular DynamicsBy performing an ensemble of molecular dynamics simulations, the model-dependent ionisation state is computed for strongly interacting systems self-consistently. This is accomplished through a free…Daniel Plummer, Pontus Svensson, Dirk O. Gericke et al.·Sep 2, 2024SaveLearn
FUSE (Fusion Synthesis Engine): A Next Generation Framework for Integrated Design of Fusion Pilot PlantsThe Fusion Synthesis Engine (FUSE) is a state-of-the-art software suite designed to revolutionize fusion power plant design. FUSE integrates first-principle models, machine learning, and reduced…O. Meneghini, T. Slendebroek, B. C. Lyons et al.·Sep 2, 2024SaveLearn
Latent Space Dynamics Learning for Stiff Collisional-radiative ModelsIn this work, we propose a data-driven method to discover the latent space and learn the corresponding latent dynamics for a collisional-radiative (CR) model in radiative plasma simulations. The CR…Xuping Xie, Qi Tang, Xianzhu Tang·Sep 1, 2024SaveLearn
Using Deep Learning to Design High Aspect Ratio Fusion DevicesThe design of fusion devices is typically based on computationally expensive simulations. This can be alleviated using high aspect ratio models that employ a reduced number of free parameters,…P. Curvo, D. R. Ferreira, R. Jorge·Aug 31, 2024SaveLearn
Exploring novel compact quasi-axisymmetric stellaratorsThe new class of compact quasi-axisymmetric stellarators with a wide range of field periods offers the unique potential to combine the advantages of the two leading magnetic confinement fusion…Tobias M. Schuett, Sophia A. Henneberg·Aug 31, 2024SaveLearn
A fast solver for the spatially homogeneous electron Boltzmann equationWe present a numerical method for the velocity-space, spatially homogeneous, collisional Boltzmann equation for electron transport in low-temperature plasma (LTP) conditions. Modeling LTP plasmas is…Milinda Fernando, Daniil Bochkov, James Almgren-Bell et al.·Aug 30, 2024SaveLearn
Stabilization of beam heated plasmas by beam modulationA constant intensity beam that propagates into a stationary plasma results in a bump-on-tail feature in velocity space. This results in an instability that transfers kinetic energy from the plasma to…Lukas Einkemmer·Aug 29, 2024SaveLearn