A5014375574- Magnetic confinement fusion research
- Fusion materials and technologies
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Plasma Diagnostics and Applications
- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Scientific Computing and Data Management
- Laser-induced spectroscopy and plasma
- Distributed and Parallel Computing Systems
- Simulation Techniques and Applications
- Ionosphere and magnetosphere dynamics
- Cold Fusion and Nuclear Reactions
- Software Engineering Research
- Technology Assessment and Management
- Nuclear physics research studies
- Systems Engineering Methodologies and Applications
- Software Engineering Techniques and Practices
- Dust and Plasma Wave Phenomena
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Quantum, superfluid, helium dynamics
- Nuclear Materials and Properties
Princeton Plasma Physics Laboratory
1988-2019
Princeton University
1986-2019
Carnegie Mellon University
2006-2019
Software Engineering Institute
2006-2018
United States Department of Defense
2007-2017
Prototypes (United States)
2017
Office of Diversity and Inclusion
2017
Institute of Electrical and Electronics Engineers
2017
U.S. Army Engineer Research and Development Center
2017
United States Army Corps of Engineers
2016
On the basis of an analysis ITER L-mode energy confinement database, two new scaling expressions for tokamak are proposed, namely a power law and offset-linear scaling. The indicates that present multiplicity time τE in tokamaks (Goldston, Kaye, Odajima-Shimomura, Rebut-Lallia, etc.) is due both to lack variation key parameter combination fs = 0.32 R a−0.75 k0.5 ∼ A a0.25k0.5, variations dependence on physical parameters among different database. By combining multiples another factor, fq...
The impurity radiation for typical tokamak parameters has been numerically calculated using an "average-ion model". Coronal equilibrium values the emission of oxygen, iron, molybdenum, tungsten and gold were determined from steady-state solutions a set related rate equations which included effects electron collisional ionization excitation, dielectronic radiative recombination, Δn = 0 ≠ line transitions, bremsstrahlung. results molybdenum compare very well with other calculations. Since...
A multi-regime model of radial particle and energy transport in tokamaks, based on the predictions low-frequency microinstability theory, has been incorporated into a one-dimensional computer code. The code also includes background neutral gas, neoclassically (3-regime) diffusing impurity ions, adiabatic compression, self-consistent neutral-injection heating by means slowing down beam ions. reasonable measure agreement with experimental results from number present-day tokamak devices is...
The need for high performance computing applications computational science and engineering projects is growing rapidly, yet there have been few detailed studies of the software process used these applications. DARPA High Productivity Computing Systems Program has sponsored a series case representative to identify steps involved in developing such (i.e. life cycle, workflows, technical challenges, organizational challenges). Secondary goals were characterize tool usage enhancements that would...
Physics knowledge (theory and experiment) in energetic particles relevant to design of a reactor scale tokamak is reviewed, projections for ITER are provided this Chapter the Basis. The review includes single particle effects such as classical alpha heating toroidal field ripple loss, well collective instabilities that might be generated plasmas by particles. overall conclusion fusion expected provide an efficient plasma ignition sustained burn next step device. major concern localized heat...
The field has reached a threshold at which better organization becomes crucial. New methods of verifying and validating complex codes are mandatory if computational science is to fulfill its promise for society.
The efficiency of neutral beam heating and current drive depends crucially on the deposition energy momentum in plasma. This is determined by atomic processes involved stopping (or effective ionization) atoms. These have been studied detail for range from 10 keV/u to MeV/u. considered include both ground state excited atoms, thus allowing multistep ionization collisions with plasma constituents impurities. cross-section has calculated a wide variety parameters. database necessary these...
Calculations have been performed which demonstrate the possibility of operating poloidal divertors at high densities and low temperatures. Ionization recycling neutral gas near divertor neutralizer plate amplifies input particle flux thereby raising plasma density lowering temperature. Low-temperature, high-density operation should reduce erosion rate walls plate, ease pumping requirements in future large tokamaks.
Spatially and temporally resolved plasma ion temperatures can be determined by measuring the Doppler-broadened line profiles of transitions excited charge-exchange recombination reactions between fast hydrogen atoms fully ionized low-Z ions. Plasma rotation velocity also obtained. A sample result from PDX tokamak using He+ radiation is presented, expected intensities for model cases TFTR are calculated.
Charge exchange with neutral hydrogen is examined as a recombination mechanism for multicharged impurity ions present in high-temperature fusion plasmas. At sufficiently low electron densities, fluxes of atomic produced by either the injection heating beams or background 'thermal' neutrals can yield an important even dominant process such ions. Equilibrium results are given selected elements showing altered ionisation balance and radiative cooling rate presence various populations. A notable...
The primary purpose of `Computational Atomic Structure' is to give a potential user the Multi-Configuration Hartree-Fock (MCHF) Structure Package an outline physics and computational methods in package, guidance on how use information interpret results. book successful all three aspects. In addition, provides good overview review atomic structure that would be useful plasma physicist interested refreshing his knowledge quantum mechanics. While most subjects are covered greater detail other...
Reduction of the peak heat loads on plasma facing components is essential for success next generation high fusion power tokamaks such as International Thermonuclear Experimental Reactor (ITER) 1 . Many present concepts accomplishing this involve use atomic processes to transfer from main chamber and divertor walls much experimental theoretical physics research in program directed toward issue. The results these experiments calculations are result a complex interplay many processes. In order...
Many institutions are now developing large-scale, complex, coupled multiphysics computational simulations for massively parallel platforms the simulation of performance nuclear weapons and certification stockpile, research in climate weather prediction, magnetic inertial fusion energy, environmental systems, astrophysics, aerodynamic design, combustion, biological biochemical other areas. The successful development these is aided by attention to sound software project management engineering....