Validation of the BEAMS3D neutral beam deposition model on Wendelstein 7-X

Samuel A Lazerson, Oliver P Ford, Carolin Nuehrenberg, Simppa Johannes Äkäslompolo, Peter Zsolt Poloskei, Mike Machielsen, Paul McNeely, Lilla Vano, Norbert Rust, Sergey A Bozhenkov, Tristan Neelis, Jonathan P Graves, David Pfefferlé, Annabelle Spanier, Dirk Hartmann, Nikolai B Marushchenko, Yuriy Turkin, Matthias Hirsch, Neha Chaudhary, Udo HöfelTorsten Stange, Gavin McCabe Weir, Novimir Antoniuk Pablant, Andreas Langenberg, Peter Traverso, Pranay Valson, Jens P Knauer, Kai Jakob Brunner, Ekkehard Pasch, Marc N A Beurskens, Hannes Damm, Golo Fuchert, Philipp Nelde, Evan R Scott, Uwe Hergenhahn, Andrea Pavone, Kian Rahbarnia, Tamara Andreeva, Jonathan Schilling, Christian Brandt, Ulrich Neuner, H Thomsen, Marcin Jakubowski, Adnan Ali, Yu Gao, Holger Niemann, Aleix Puig Sitjes, Ralf Koenig, Robert C Wolf

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The neutral beam deposition model in the BEAMS3D code is validated against neutral beam attenuation data from Wendelstein 7-X (W7-X). A set of experimental discharges where the neutral beam injection system of W7-X was utilized were reconstructed. These discharges scanned the magnetic configurations and plasma densities of W7-X. The equilibrium reconstructions were performed using STELLOPT which calculates three-dimensional self-consistent ideal magnetohydrodynamic equilibria and kinetic profiles. These reconstructions leveraged new capabilities to incorporate electron cyclotron emission and X-ray imaging diagnostics in the STELLOPT code. The reconstructed equilibria and profiles served as inputs for BEAMS3D calculations of neutral beam deposition in W7-X. It is found that if reconstructed kinetic profiles are utilized, good agreement between measured and simulated beam attenuation is found. As deposition models provide initial conditions for fast-ion slowing down calculations, this work provides a first step towards validating our ability to predict fast ion confinement in stellarators.
Original languageEnglish
Article number076020
JournalNuclear Fusion
Issue number7
Publication statusPublished - Jul 2020


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