Results 91 to 100 of about 2,872,515 (340)

Predictive JET current ramp-up modelling using QuaLiKiz-neural-network

Nuclear Fusion, 2023
This work applies the coupled JINTRAC and QuaLiKiz-neural-network (QLKNN) model on the ohmic current ramp-up phase of a JET D discharge. The chosen scenario exhibits a hollow $T_\mathrm{e}$ profile attributed to core impurity accumulation, which is ...
A. Ho, J. Citrin, C.D. Challis, C. Bourdelle, F.J. Casson, J. Garcia, J. Hobirk, A. Kappatou, D.L. Keeling, D.B. King, F. Koechl, E. Lerche, C.F. Maggi, J. Mailloux, JET Contributors   +14 more
doaj   +1 more source

Impurity-induced tuning of quantum well states in spin-dependent resonant tunneling [PDF]

, 2004
We report exact model calculations of the spin-dependent tunneling in double magnetic tunnel junctions in the presence of impurities in the well.
A. Coho, A. Granovsky, Alan Kalitsov, Anatoly Vedyayev, C. B. Duke, M. Chshiev, Nicholas Kioussis   +6 more
core   +1 more source

Isotopic dependence of impurity transport driven by ion temperature gradient turbulence [PDF]

, 2016
Hydrogenic ion mass effects, namely, the isotopic effects on impurity transport driven by ion temperature gradient (ITG) turbulence are investigated using gyrokinetic theory.
Weixin Guo, Lu Wang, G. Zhuang
semanticscholar   +1 more source

Impurity Transport Studies on LHD

Plasma and Fusion Research, 2007
The preliminary results of impurity transport studies in the Large Helical Device (LHD) by means of a newly developed the Stellarator Impurity Transport code SIT STRAHL [1] are reported. The attenuation of the emission lines from the ionized Ti ions, launched in the plasma edge by means of the TESPEL injector has been numerically simulated and compared
Yu. IGITKHANOV, P. GONCHAROV, S. SUDO, N. TAMURA, D. KALININA, H. FUNABA, M. YOKOYAMA, S. MURAKAMI, K. KAWAHATA, T. KATO, T. MORISAKI, B. PETERSON, Y. HAKAMURA, H. YAMADA, O. MOTOJIMA.   +14 more
openaire   +2 more sources

Four‐Point Bending Tests at High Temperatures on Commercial MgO‐C Refractory Bricks with and Without Recyclate Considering Different Carbon Contents

Advanced Engineering Materials, EarlyView.
Four‐point bending tests are conducted in an argon atmosphere on commercial MgO‐C brick grades with and without MgO‐C recyclate from room temperature up to 1300 °C. No detrimental effect of the MgO‐C recyclates on bending strength is found. Instead, a decisive influence of the total carbon content is observed, with lower total carbon contents ...
Alexander Schramm, Lukas Knöchel, Thomas Schemmel, Christos G. Aneziris, Anja Weidner, Horst Biermann   +5 more
wiley   +1 more source

Bayesian inference of radial impurity transport in the pedestal of ASDEX Upgrade discharges using charge-exchange spectroscopy

Nuclear Fusion
We present a novel framework for quantifying radial impurity transport in the pedestal of ASDEX Upgrade (AUG) discharges. Our method is based on charge-exchange recombination spectroscopy measurements of line radiation from multiple impurity charge ...
T. Gleiter, R. Dux, F. Sciortino, T. Odstrčil, D. Fajardo, C. Angioni, J. Buchner, R.M. McDermott, T. Hayward-Schneider, G.F. Harrer, M. Faitsch, M. Griener, R. Fischer, E. Wolfrum, U. Stroth, the ASDEX Upgrade Team   +15 more
doaj   +1 more source

Characterization of a Recyclate‐Based MgO‐Steel Composite As‐Sintered Inert Anode Candidate After Exposure to Cryolite Electrolysis

Advanced Engineering Materials, EarlyView.
Carbon‐free inert anodes are essential for decarbonizing aluminum electrolysis. This study investigates a recyclate‐based MgO‐316L steel composite anode tested under galvanostatic Hall–Héroult conditions in cryolite at 1000°C. Microstructural analysis reveals selective MgO fluorination, spinel and oxide layer formation, electrolyte infiltration, and ...
Serhii Yaroshevskyi, Alexander Adamczyk, Nora Brachhold, Gert Schmidt, Jana Hubálková, R. Gumeniuk, Alexandros Charitos, Christos G. Aneziris   +7 more
wiley   +1 more source

Understanding helium transport: experimental and theoretical investigations of low-Z impurity transport at ASDEX Upgrade

Nuclear Fusion, 2017
The presence of helium is fundamentally connected to the performance of a fusion reactor, as fusion-produced helium is expected to heat the plasma bulk, while He ‘ash’ accumulation dilutes the fusion fuel.
A. Kappatou, R. McDermott, C. Angioni, P. Manas, T. Pütterich, R. Dux, E. Viezzer, R. Jaspers, R. Fischer, M. Dunne, M. Cavedon, M. Willensdorfer, G. Tardini   +12 more
semanticscholar   +1 more source

Electrostatic potential variation on the flux surface and its impact on impurity transport [PDF]

, 2015
The impurity transport in magnetically confined plasmas under some conditions finds neither quantitatively nor qualitatively a satisfactory theory-based explanation.
J. M. García-Regaña, C. Beidler, R. Kleiber, P. Helander, A. Mollén, J. Alonso, M. Landreman, H. Maassberg, H. Smith, Y. Turkin, J. Velasco   +10 more
semanticscholar   +1 more source

Removing Oxide Layers and Retaining Oxide‐Free Steel Surfaces by Polishing in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this study, the efficacy of wet mechanical polishing under an oxygen‐free atmosphere for deoxidation and the retention of an oxide‐free steel surface are elucidated using X‐ray photoelectron spectroscopy. The methodology proved successful; however, the results were highly dependent on the preparation of the solvents used to clean the samples after ...
Friedrich Bürger, Lienhard Wegewitz, Wolfgang Maus‐Friedrichs   +2 more
wiley   +1 more source