31 to 40 of 570 Results
Jun 9, 2025
H. S. Wilson, A. O. Nelson, J. McClenaghan, P. Rodriguez-Fernandez, J. Parisi, C. Paz-Soldan, 2025, "Characterizing the negative triangularity reactor core operating space with integrated modeling", https://doi.org/10.7910/DVN/K2VAYL, Harvard Dataverse, V1
Negative triangularity (NT) has received renewed interest as a fusion reactor regime due to its beneficial power-handling properties, including low scrape-off layer power and a larger divertor wetted area that facilitates simple divertor integration. NT experiments have also demonstrated core performance on par with positive triangularity (PT) high... |
Elizabeth A. Tolman, Peter J. Catto, 2025, "Quasilinear drift kinetic theory of alpha particle transport by neoclassical tearing modes", https://doi.org/10.7910/DVN/K5ATEW, Harvard Dataverse, V1
Kinetic theory of particles near resonances is a current topic of discussion in plasma physics and astrophysics.We extend this discussion to the kinetic theory of the interaction between alpha particles (energetic particles predicted to exist in large quantities in nextgeneration fusion experiments) and a neoclassical tearing mode (NTM), a resistiv... |
Jun 9, 2025
Parisi, J.F.; Guttenfelder, W.; Nelson, A.O.; Gaur, R.; Kleiner, A.; Lampert, M.; Avdeeva, G.; Berkery, J.W.; Clauser, C.; Curie, M.; Diallo, A.; Dorland, W.; Kaye, S.M.; Mcclenaghan, J.; Parra, F.I., 2025, "Kinetic-ballooning-limited pedestals in spherical tokamak plasmas", https://doi.org/10.7910/DVN/EMCEVC, Harvard Dataverse, V1
A theoretical model is presented that for the first time matches experimental measurements of the pedestal width-height Diallo scaling in the low-aspect-ratio high-β tokamak NSTX. Combining linear gyrokinetics with self-consistent pedestal equilibrium variation, kinetic-ballooning, rather than ideal-ballooning plasma instability, is shown to limit... |
Perks, C.; Vezinet, D.; Rice, J.E.; Reinke, M.L., 2025, "Performance predictions of the SPARC x-ray crystal spectrometers for ion temperature and toroidal rotation measurements", https://doi.org/10.7910/DVN/XPJTK6, Harvard Dataverse, V1
SPARC will be outfitted with three systems of X-ray crystal spectrometer arrays. Two of these are designed using cylindrically bent crystals to achieve high spectral-resolution for ion temperature and toroidal velocity measurements via imaging He-like Kr and Ne-like Xe. The last acts as a spectral survey system to monitor Ne-like W and nearby Hi an... |
Joshua Stillerman, Stephen Lane-Walsh, Mark Winkel, Cristina Rea, Gregorio Luigi Trevisan, Aleksandar Jelenak, John Readey, 2024, "MDSplusML - Optimizations for data access to facilitate machine learning pipelines", https://doi.org/10.7910/DVN/93NA6A, Harvard Dataverse, V2, UNF:6:9p1/TSJCXhZtmple2TcLhg== [fileUNF]
The MDSplus data management system is widely used in the magnetic fusion energy research community for data storage, management, and remote access. The system provides data access through a vector based, interpreter API. It was developed and optimized for rapid single shot analyses. Machine Learning applications require data from large numbers of s... |
Devitre, A.R.; Fischer, D.X.; Woller, K.B.; Clark, B.C.; Short, M.P.; Whyte, D.G.; Hartwig, Z.S., 2025, "A facility for cryogenic ion irradiation and in situ characterization of rare-earth barium copper oxide superconducting tapes", https://doi.org/10.7910/DVN/XQCEAS, Harvard Dataverse, V1
Superconducting magnets based on Rare Earth Barium Copper Oxides (REBCO) offer transformative capabilities in the fields of fusion energy, high energy physics, and space exploration. A challenge shared by these applications is the limited lifetime of REBCO due to radiation damage sustained during operation. Here we present a new ion-beam facility t... |
Jun 3, 2025
S. Benjamin, C. Clauser, C. Rea, R. Sweeney, A. Kumar, E. Marmar, 2024, "Macroscopic trends of linear tearing stability in cylindrical current profiles", https://doi.org/10.7910/DVN/U1ASIK, Harvard Dataverse, V2
The likelihood of realising tokamak power-plants will be greatly improved by the discovery of high-gain equilibria that resist the formation of small islands and hence avoid the disruptive neoclassical tearing mode. However the complexity and variety of tearing-onset physics has obscured the design decisions that may lead to such stability. Here we... |
Vanovac, B.; Dunne, M.; Pütterich, T.; Happel, T.; Hobirk, J.; Silvagni, D.; Faitsch, M.; Lee, K.; Conway, G.D.; Bielajew, R.; Yoo, C.; White, A.E.; Bernert, M.; David, P.; Fischer, R.; Stieglitz, D., 2025, "Pedestal properties of negative triangularity discharges in ASDEX Upgrade", https://doi.org/10.7910/DVN/A9W2BU, Harvard Dataverse, V1
In this work, we explore the pedestal properties of negative triangularity discharges with upper triangularity of delta ≈ −0.35 and with both ion gradB drift directions. In all cases, the discharges undergo a transition to H-mode with accompanying edge-localized modes (ELMs) that are not explained by the peeling-ballooning stability analysis alone.... |
Jun 2, 2025
Sam Packman, Nicolò Riva Pablo Rodriguez-Fernandez, 2025, "Bayesian Methods for Magnetic and Mechanical Optimization of Superconducting Magnets for Fusion", https://doi.org/10.7910/DVN/APFUMO, Harvard Dataverse, V1
Stellarators as compact fusion power sources have incredible potential to help combat climate change. However, the task of making that a reality faces many challenges. This work uses Bayesian optimization, (BO) which is a method that is well suited to black-box optimizations, to address the complicated optimization problem inherent by stellarator d... |
Jun 2, 2025
Peter J. Catto, 2025, "Lower hybrid current drive for an intense monochromatic applied field", https://doi.org/10.7910/DVN/OAYJNU, Harvard Dataverse, V1
The intense applied lower hybrid electric 7ields used to drive current in tokamaks can result in the formation of velocity space island structure. When this happens the lower hybrid current drive ef7iciency can be calculated and is shown to be below the quasilinear level. |
