Post disruption reconnection event driven by a runaway currentThe role of a runaway current in a post disruption plasma is investigated through numerical simulations in an asymmetric magnetic reconnection event. While the runaways do not alter the linear growth…L. Singh, D. Borgogno, F. Subba et al.·Sep 5, 2023SaveLearn
Average-atom Ziman resistivity calculations in expanded metallic plasmas: effect of mean ionization definitionWe present calculations of electrical resistivity for expanded boron, aluminum, titanium and copper plasmas using the Ziman formulation in the framework of the average-atom model. Our results are…Nadine Wetta, Jean-Christophe Pain·Sep 5, 2023SaveLearn
Transition to super-diffusive transport in turbulent plasmasWe investigate the motion of charged particles in a turbulent electrostatic potential using guiding-center theory. By increasing the Larmor radius, the dynamics exhibit close-to-ballistic transport…Matteo Stanzani, Filippo Arlotti, Guido Ciraolo et al.·Sep 4, 2023SaveLearn
First data and preliminary experimental results from a new Doppler Backscattering system on the MAST-U spherical tokamakA new Doppler backscattering (DBS) system, consisting of Q-band and V-band, has been installed and achieved its first data on the MAST-U spherical tokamak. The Q-band and V-band have separate…P. Shi, R. Scannell, J. Wen et al.·Sep 1, 2023SaveLearn
Electron surface scattering kernel for a plasma facing a semiconductorEmploying the invariant embedding principle for the electron backscattering function, we present a scheme for constructing an electron surface scattering kernel to be used in the boundary condition…F. X. Bronold, F. Willert·Sep 1, 2023SaveLearn
Critical roles of edge turbulent transport in the formation of high-field-side high-density front and density limit disruption in J-TEXT tokamakThis article presents an in-depth study of the sequence of events leading to density limit disruption in J-TEXT tokamak plasmas, with an emphasis on boudary turbulent transport and the…Peng Shi, Yuhan Wang, Li Gao et al.·Sep 1, 2023SaveLearn
Influence of the magnetic field's curvature on the radial-azimuthal dynamics of a Hall thruster plasma discharge with different propellantsThe topology of the applied magnetic field is an important design aspect of Hall thrusters. For modern Hall thrusters, the field topology most often features curved lines with a concave (negative)…Maryam Reza, Farbod Faraji, Aaron Knoll·Sep 1, 2023SaveLearn
High-energy acceleration phenomena in extreme radiation-plasma interactionsWe simulate, using a particle-in-cell code, the chain of acceleration processes at work during the Compton-based interaction of a dilute electron-ion plasma with an extreme-intensity, incoherent…J. C. Faure, D. Tordeux, L. Gremillet et al.·Sep 1, 2023SaveLearn
Optical Probing of Ultrafast Laser-Induced Solid-to-Overdense-Plasma TransitionsUnderstanding the target dynamics during its interaction with a relativistic ultrashort laser pulse is a challenging fundamental multi-physics problem involving at least atomic and solid-state…Yasmina Azamoum, Georg Alexander Becker, Sebastian Keppler et al.·Sep 1, 2023SaveLearn
Modeling terahertz emissions from energetic electrons and ions in foil targets irradiated by ultraintense femtosecond laser pulsesTerahertz (THz) emissions from fast electron and ion currents driven in relativistic, femtosecond laser-foil interactions are examined theoretically. We first consider the radiation from the…E. Denoual, L. Bergé, X. Davoine et al.·Aug 31, 2023SaveLearn
Zonal density staircase formation in collisional drift-wave turbulenceTurbulence-driven quasi-stationnary structures known as 'staircase' are investigated using the collisional drift-wave model. Two-dimensional simulations show that the ability of zonal density…M. Leconte, T. Kobayashi·Aug 31, 2023SaveLearn
Machine learning assisted analysis of visible spectroscopy in pulsed-power-driven plasmasWe use machine learning models to predict ion density and electron temperature from visible emission spectra, in a high energy density pulsed-power-driven aluminum plasma, generated by an exploding…Rishabh Datta, Faez Ahmed, Jack D Hare·Aug 31, 2023SaveLearn
Suppressing electron disorder-induced heating of ultracold neutral plasma via optical latticeDisorder-induced heating (DIH) prevents ultracold neutral plasma into electron strong coupling regime. Here we propose a scheme to suppress electronic DIH via optical lattice. We simulate the…HaiBo Wang, Zonglin Yao, Fuyang Zhou et al.·Aug 31, 2023SaveLearn
Investigation of W-SiC compositionally graded films as a divertor materialW-SiC composite material is a promising plasma-facing material candidate alternative to pure W due to the low neutron activation, low impurity radiation, and low tritium diffusivity of SiC while…Zihan Lin, Carlos Monton, Stefan Bringuier et al.·Aug 30, 2023SaveLearn
Global Linear and Nonlinear Gyrokinetic Simulations of Tearing ModesTo better understand the interaction of global tearing modes and microturbulence in the Madison Symmetric Torus (MST) reversed-field pinch (RFP), the global gyrokinetic code Gene is modified…T. Jitsuk, A. Di Siena, M. J. Pueschel et al.·Aug 30, 2023SaveLearn
Effects of Disorder on Electron Heating in Ultracold PlasmasStarting from the beginning of their research in the early 2000's, the ultracold plasmas were considered as a promising tool to achieve considerable values of the Coulomb coupling parameter for…Yurii V. Dumin, Anastasiia T. Lukashenko·Aug 30, 2023SaveLearn
Development of the Thomson scattering measurement system for cascade arc device with indirectly heated hollow cathodeWe have developed a Thomson scattering measurement system for the cascade arc discharge device designed for the plasma window (PW) application study. The PW is one of the plasma application…K. Yamasaki, K. Okuda, J. Kono et al.·Aug 30, 2023SaveLearn
Absolute value measurement of ion-scale turbulence by two-dimensional phase contrast imaging in Large Helical DeviceAbsolute value measurements of turbulence amplitude in magnetically confined high-temperature plasmas can effectively explain turbulence-driven transport characteristics and their role in plasma…T. Kinoshita, K. Tanaka, H. Sakai et al.·Aug 30, 2023SaveLearn
Towards Robust Solvers for Nuclear Fusion Simulations Using JOREK: A Numerical Analysis PerspectiveOne of the most well-established codes for modeling non-linear Magnetohydrodynamics (MHD) for tokamak reactors is JOREK, which solves these equations with a Bézier surface based finite element…Alex Quinlan, Vandana Dwarka, Ihor Holod et al.·Aug 30, 2023SaveLearn
Resonant dynamics of one-side multipactor on dielectric surfaceBreakdown of dielectric RF windows is an important issue for particle accelerators and high-power RF sources. One of the common reasons for RF window failure is the multipactor on a dielectric…Gennady Romanov·Aug 29, 2023SaveLearn
Cs evaporation in a negative ion source and Cs cleaning tests by plasma sputteringThe compact radio frequency negative ion source NIO1 (Negative Ion Optimization phase 1) has been designed, built and operated by Consorzio RFX and INFN-LNL in order to study and optimize the…M. Barbisan, R. S. Delogu, A. Pimazzoni et al.·Aug 29, 2023SaveLearn
Helicity of the magnetic axes of quasi-isodynamic stellaratorsIn this study, we explore the influence of the helicity of the magnetic axis-defined as the self-linking number of the curve-on the quality of quasi-isodynamic stellarator-symmetric configurations…Katia Camacho Mata, Gabriel G. Plunk·Aug 29, 2023SaveLearn
On learning latent dynamics of the AUG plasma stateIn this work, we demonstrate the utility of state representation learning applied to modeling the time evolution of electron density and temperature profiles at ASDEX-Upgrade (AUG). The proposed…A. Kit, A. E. Järvinen, Y. R. J. Poels et al.·Aug 28, 2023SaveLearn
Dynamic Mode Decomposition for data-driven analysis and reduced-order modelling of ExB plasmas: II. dynamics forecastingIn part I of the article, we demonstrated that a variant of the Dynamic Mode Decomposition (DMD) algorithm based on variable projection optimization, called Optimized DMD (OPT-DMD), enables a robust…Farbod Faraji, Maryam Reza, Aaron Knoll et al.·Aug 26, 2023SaveLearn
Dynamic Mode Decomposition for data-driven analysis and reduced-order modelling of ExB plasmas: I. Extraction of spatiotemporally coherent patternsIn this two-part article, we evaluate the utility and the generalizability of the Dynamic Mode Decomposition (DMD) algorithm for data-driven analysis and reduced-order modelling of plasma dynamics in…Farbod Faraji, Maryam Reza, Aaron Knoll et al.·Aug 26, 2023SaveLearn