Fusion reactivity graphs and tables for charged particle reactions

McNally, J. Rand; Rothe, K. E.; Sharp, R. D.

doi:10.2172/5992170

Cited by 26 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For a given process, the ratio of the powers of that process in the edge and Of course, in computing the ratio of edge effects to central region effects for particular quantities like bremsstrahlung power or power transferred between ions and electrons, the exact answer will involve other numerical factors to account for parameters such as particle temperatures in the edge versus in the core, Coulomb logarithms in the two 30 different regions, etc. Precise evaluation of these factors requires detailed spatial profiles of the electron temperature and ion temperature in the edge region, but in general the net result of the factors will be to change the result above by at most about a factor of two or three.…”

Section: Relative Importance Of Edge and Central Plasma Regionsmentioning

confidence: 99%

“…However, under these conditions where the beam energy is 3/2 41 of the Maxwellian temperature, the reactivity can be well approximated to within a few percent by the Maxwellian-averaged reactivity; hence the Maxwellian-averaged < av > values are used for simplicity. Cross section data is drawn from references [28], [29], and [30]. The tables also compare the time required for ions to be lost via upscattering into the high-energy tail with the time required for them to fuse.…”

Section: Performance For Various Fuelsmentioning

confidence: 99%

See 1 more Smart Citation

A general critique of inertial-electrostatic confinement fusion systems

Rider

1995

Physics of Plasmas

View full text Add to dashboard Cite

The suitability of various implementations of inertial-electrostatic confinement (IEC) systems'for use as D-T, D-D, D-3 He, p-l 1 B, and p-6 Li reactors is examined; these IEC designs create a deep electrostatic potential well within the plasma in order to confine and accelerate ions, and they typically use magnetic fields or electrostatic grids to confine electrons. It is shown that while an IEC reactor would have the advantages of high power densities and relatively simple engineering design when compared with other fusion schemes, it suffers from several flaws. Foremost among these problems is that on the basis of velocity-space diffusion calculations, it does not appear to be possible for the dense central region of a reactor-grade device to maintain significantly non-Maxwellian ion distributions or to keep two different ion species at significantly different temperatures; this discovery contradicts earlier claims of the particular suitability of IEC systems for advanced fuels. Since the ions form a Maxwellian distribution with a mean energy not very much smaller than the electrostatic well depth, ions in the energetic tail of the distribution will likely be lost at rates greatly in excess of the fusion rate. Furthermore, even optimistic assumptions about the performance of the surrounding polyhedral cusp magnetic field lead to the conclusion that the electron losses from the machine will be intolerable for all fuels except DT. If electrostatic grids are used instead of magnetic cusps, the particle losses should be even worse. Finally, because the Maxwellian ion distributions are not fundamentally different than those in other fusion schemes, bremsstrahlung losses will be similar; in particular, the ratio of bremsstrahlung power to fusion power will at best be -1.7 for p-11 B and -5.4 for p-6 Li, demonstrating that IEC cannot utilize proton-based fuels in a practical manner. In order for IEC systems to be used as fusion reactors, it will be necessary to find methods to circumvent these problems.

show abstract

Section: Relative Importance Of Edge and Central Plasma Regionsmentioning

confidence: 99%

Section: Performance For Various Fuelsmentioning

confidence: 99%

A general critique of inertial-electrostatic confinement fusion systems

Rider

1995

Physics of Plasmas

View full text Add to dashboard Cite

show abstract

“…When coupled with radiation diffusion, 3T physics, and thermal conduction, the default and unsplit hydrodynamic methods give similar burn-averaged ion temperatures, both when the hot spot forms and when the fusion reaction rate is maximum ("bang time"), as shown in Figure 7. e burn- averaged ion temperature is calculated by taking a weighted average of the ion temperature across the entire mesh, using available deuterium fusion reaction rate data to find the weight for each zone [36]. Highly resolved 1D simulation results are presented at a uniform spatial resolution of 0.125 μ m. After 0.8 ns, there is a noticeable difference in burn-averaged ion temperature between the two methods, with the unsplit method producing a temperature that is 0.8 keV higher at 1.2 ns.…”

Section: Direct Drive Icf Problemmentioning

confidence: 99%

Verification and Validation of Two Hydrodynamic Methods for Simulations of High Energy Density Physics Problems

Chiravalle

2022

Laser Part. Beams

View full text Add to dashboard Cite

A 3D verification and validation suite of test problems is presented and used to evaluate hydrodynamic methods within a radiation hydrodynamics code, xRAGE. These test problems exercise different levels of complexity, building towards ICF problems which in addition to hydrodynamics also include three temperature plasma physics, thermal conduction, and radiation diffusion. Among the problems in the test suite are the Kidder ball problem, the Verney shell problem, and a 5-material compression problem, which exercise different purely hydrodynamic methods implemented within xRAGE. There is excellent agreement between 2D and 3D XRAGE simulation results and between the xRAGE results and the benchmark solutions. Two 3D ICF test problems are also presented, based on an OMEGA direct drive capsule experiment and on a NIF indirect drive capsule experiment. It is demonstrated that the newer unsplit hydrodynamic method in xRAGE produces more vorticity relative to the older default method. For the indirect drive capsule, the 3D simulations are in reasonable agreement with the experimental values of ion temperature and neutron production.

show abstract

“…with {a~}~,,( ) as the corresponding reaction rate parameters depending on!y upon the kinetic temperature of the deuterium population (McNally et al, 1979 The determination of the nuclear power thus generated in this volume requires knowledge of the deuterium density with time, Ndft), as well as the kinetic temperature of these ion populations so as to specify feU}C ). Since ( tTV )&t z ( cJV) ~+ We take < (TV )dd = ( (To )dd,f = ( UV )dd,h (McNally et ffl., 1979).…”

Section: (Lb)mentioning

confidence: 99%

The nuclear and aerial dynamics of the Tunguska Event

D’Alessio

Harms

1989

Planetary and Space Science

View full text Add to dashboard Cite

Abstract-A mathematical-physical characterization of an atmospheric "explosive" event-commonly called the Tunguska Event of 1908-has been formulated. Emphasis is placed upon the aerial dynamics and the nuclear energy released in the gas cap of the meteor as it passed through the atmosphere.The results obtained are consistent with the dominant phenomena observed for the Tunguska Event suggesting therefore a plausible reconstruction of the physical processes associated with this unusual event.

show abstract

Fusion reactivity graphs and tables for charged particle reactions

Abstract: Graphs and tables are present~d on 31 light isotope fusion reaction parameters : , n, Q+, nQ+ (for n = 10 20 fuel ion species/m3 and Q~ = energy rdlease in ch~rged particles)] in the .. kinetic temperature range 1 to 1000 keV • .

Cited by 26 publications

References 0 publications

A general critique of inertial-electrostatic confinement fusion systems

A general critique of inertial-electrostatic confinement fusion systems

Verification and Validation of Two Hydrodynamic Methods for Simulations of High Energy Density Physics Problems

The nuclear and aerial dynamics of the Tunguska Event

Contact Info

Product

Resources

About