R
Robert Granetz
Researcher at Massachusetts Institute of Technology
Publications - 241
Citations - 9734
Robert Granetz is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Alcator C-Mod & Tokamak. The author has an hindex of 47, co-authored 233 publications receiving 8686 citations.
Papers
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Data augmentation for disruption prediction via robust surrogate models
Katharina Rath,David Rügamer,Bernd Bischl,U. von Toussaint,Chris Rea,Andrew Maris,Robert Granetz,Christopher G. Albert +7 more
TL;DR: A robust augmentation of the training database for multivariate time series data using Student $t$ process regression in a state space formulation via Bayesian filtering to tackle challenges imposed by outliers and noise in the training data set and to reduce the computational complexity.
Proceedings ArticleDOI
Results and status of the Alcator C-Mod tokamak
S. J. Wukitch,W. Beck,E. Fitzgerald,Robert Granetz,D. Gwinn,M. Grimes,J. H. Irby,Earl Marmar,D. Terry,Peter H. Titus,R.F. Vieira,Scot A. Wolfe,J. Zaks,S. Bernabei,R. Ellis,L. Gereg,J. Hosea,D. Loesser,G. Schilling,J. R. Wilson +19 more
TL;DR: In this article, the ICRF system has been recently upgraded with the improved performance of the 4-strap antenna and the antennas also make use of BN protection tiles to eliminate high Z impurities from the antennas.
Journal ArticleDOI
Cross-machine comparison of runaway electron generation during tokamak start-up for extrapolation to ITER
P. de Vries,Y. H. Lee,Y. Gribov,A.B. Mineev,Yong-Su Na,Robert Granetz,Benjamin Stein-Lubrano,C. Reux,Philippe Moreau,V. G. Kiptily,B. Esposito,D. J. Battaglia,J.R Martin-Solis +12 more
TL;DR: In this article , a cross-machine comparison of global parameters that determine the runaway electron (RE) generation and loss process during tokamak start-up was carried out with the aim to extrapolate these to ITER.
Journal ArticleDOI
Disruption halo current rotation scaling on Alcator C-Mod and HBT-EP
A Saperstein,R. Alexander Tinguely,Robert Granetz,J.P. Levesque,Michael E. Mauel,G.A. Navratil +5 more
TL;DR: In this article , a non-circular version of the scaling law for the disruption halo currents rotation frequency was proposed, taking into account the dependence of frot on the poloidal structure of the MHD instability driving the asymmetry.
Journal ArticleDOI
High-resolution disruption halo current measurements using Langmuir probes in Alcator C-Mod
TL;DR: In this paper, Langmuir "rail" probes are embedded in a lower outboard divertor module in a closely-spaced vertical (poloidal) array, which provides detailed resolution of the spatial dependence of the halo current distribution in the plasma scrape-off region with high time resolution.