A5002108227- Magnetic confinement fusion research
- Distributed and Parallel Computing Systems
- Computer Graphics and Visualization Techniques
- Ionosphere and magnetosphere dynamics
- Advanced Data Storage Technologies
- Fusion materials and technologies
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Data Visualization and Analytics
- Scientific Computing and Data Management
- Computational Physics and Python Applications
- 3D Shape Modeling and Analysis
- Advanced Numerical Analysis Techniques
- Solar and Space Plasma Dynamics
- Nuclear and radioactivity studies
- Advanced Data Processing Techniques
- Remote Sensing and LiDAR Applications
- Topology Optimization in Engineering
- 3D Surveying and Cultural Heritage
- Anomaly Detection Techniques and Applications
- Electric Motor Design and Analysis
- Embedded Systems Design Techniques
- Electromagnetic Simulation and Numerical Methods
- Parallel Computing and Optimization Techniques
- Open Education and E-Learning
Princeton Plasma Physics Laboratory
2007-2023
Princeton University
2005-2020
V.F. Corporation (United States)
2000
Toshiba (United States)
1995
Cornell University
1980-1982
Aliasing artifacts are eliminated from computer generated images of textured polygons by equivalently filtering both the texture and edges polygons. Different filters can be easily compared because weighting functions that define shape pre-computed stored in lookup tables. A polygon subdivision algorithm removes hidden surfaces so rendered sequentially to minimize accessing definition files. An implementation rendering procedure is described.
Aliasing artifacts are eliminated from computer generated images of textured polygons by equivalently filtering both the texture and edges polygons. Different filters can be easily compared because weighting functions that define shape pre-computed stored in lookup tables. A polygon subdivision algorithm removes hidden surfaces so rendered sequentially to minimize accessing definition files. An implementation rendering procedure is described.
Gyrokinetic simulations of plasma microturbulence in tokamaks are challenging to visualize because the compute grid follows magnetic field lines that spiral around torus. We have overcome this challenge by developing three new approaches improve visualization gyrokinetics. Our techniques work directly with topology flux surfaces where simulation stores variables concentric rings on poloidal planes (vertical cross sections torus). preview step triangulates each consecutive pair display data a...
The mission of the National Spherical Torus Experiment (NSTX) is demonstration physics basis required to extrapolate next steps for spherical torus (ST), such as a plasma facing component test facility (NHTX) or an ST based (ST-CTF), and support ITER. Key issues are transport, steady state high β operation. To better understand electron new high- k scattering diagnostic was used extensively investigate gyro-scale fluctuations with varying temperature gradient scale length. Results from n = 3...
We introduce a topology optimization method to design permanent magnets for advanced stellarators. Recent research shows that have great potential simplify stellarator coils. adopt state-of-the-art numerical techniques determine the presence of in entire space. The FAMUS code is developed and it can engineering-feasible general stellarators satisfying constraints maximum material magnetization explicit forbidden regions. has been successfully verified against previously proposed linear...
We focus on theater-wide situational awareness covering a large geographic area containing many military units. The Joint Operations Visualization Environment (JOVE), developed at Sarnoff to assist decision makers, optimizes the display of tactical data for information presentation. JOVE uses three rear-projected displays driven from an SGI Onyx2 Infinite Reality2 computer. Stereoscopic is available. A joystick, graphical user interface, and speech commands provide interaction. delivers...
Performance of the ITER is anticipated to be highly sensitive edge plasma condition. The pedestal in needs predicted from an integrated simulation necessary first-principles, multi-scale physics codes. mission SciDAC Fusion Simulation Project (FSP) Prototype Center for Plasma Edge (CPES) deliver such a code integration framework by (1) building new kinetic codes XGC0 and XGC1, which can simulate buildup; (2) using improving existing MHD ELITE, M3D-OMP, M3D-MPP NIMROD, study large-scale...
In addressing the Department of Energy's April, 2022 announcement a Bold Decadal Vision for delivering Fusion Pilot Plant by 2035, associated software tools need to be developed integration real world engineering and supply chain data with advanced science models that are accelerated Machine Learning. An research development effort has been introduced here promising early progress on delivery realistic Digital Twin Tokamak benefited from advances Princeton University AI Deep Learning...
The goal of the high harmonic fast wave (HHFW) research on NSTX is to maximize coupling RF power core plasma by minimizing edge loss processes. HHFW heating efficiency in helium and deuterium L‐mode discharges found improve markedly when density 2 cm front antenna reduced below that for onset perpendicular propagation (nonset∝B*k‖2/ω). In NSTX, observed losses are driven vicinity as opposed resulting from multi‐pass damping. PDI surface through ion‐electron collisions estimated be...
Abstract This paper reports on advances in the state‐of‐the‐art deep learning disruption prediction models based Fusion Recurrent Neural Network (FRNN) originally introduced a 2019 NATURE publication [ https://doi.org/10.1038/s41586‐019‐1116‐4 ]. In particular, predictor now features not only “disruption score,” as an indicator of probability imminent disruption, but also “sensitivity score” real time to indicate underlying reasons for disruption. adds valuable physics interpretability model...
We describe a new class of magnetic confinement device, with the axis in shape knot. call such devices “knotatrons.” An example is given that has large volume filled surfaces, significant rotational-transform, and field produced entirely by external circular coils.
Fusion energy science, like other science areas in DOE, is becoming increasingly data intensive and network distributed. We discuss management techniques that are essential for scientists making discoveries from their simulations experiments, with special focus on the support Simulation Project (FSP) may need. However, discussion applies to a broader audience since most of fusion SciDAC's, FSP proposals include strong component. Simulations ultra scale computing platforms imply an ability...
The National Fusion Collaboratory focuses on enabling fusion scientists to explore grid capabilities in support of experimental science. experiments are structured as a series plasma pulses initiated roughly every 20 minutes. In the between-pulse intervals perform data analysis and discuss results reach decisions affecting changes next pulse. This interaction can be made more efficient by performing engaging expertise from geographically distributed team resources. this paper, we describe...
The FACETS (Framework Application for Core-Edge Transport Simulations) project began in January 2007 with the goal of providing core to wall transport modeling a tokamak fusion reactor. This involves coupling previously separate computations core, edge, and regions. Such is primarily through connection regions lower dimensionality. has started developing component-based framework bring together models each these In first year, model will be 1 ½ dimensional (1D across flux surfaces coupled 2D...
Situational awareness applications require a highly detailed geospatial visualization covering large geographic area. Conventional polygon based terrain modeling would exceed the capacity of current computer rendering. Terrain techniques for situational application are described in this case study. Visualizing amounts data has been achieved using very texture maps. Sun shading is applied to map enhance perception relief features. Perception submarine positions enhanced translucent, textured...
Simulations of physical processes are frequently used to study a continuous three-dimensional volume. In order apply computational methods, the volume is approximated by discrete grid. typically organized compute variables at each location on Visualizing results requires exploring data with variety presentation techniques. Our movie illustrates applying these techniques dataset generated Raleigh-Taylor astrophysics simulation. However, general-purpose approaches can be applied 3D grid...