Discussion:Fusion aneutronique

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Chapitre non traduit[modifier le code]

J'ai pris la liberté de ne pas traduire le chapitre Power density (densité de puissance), qui ne fournit aucune source et qui, jusqu'à preuve du contraire, me semble être un travail inédit :

In every published fusion power plant design, the part of the plant that produces the fusion reactions is much more expensive than the part that converts the nuclear power to electricity. In that case, as indeed in most power systems, the power density is a very important characteristic.[1] If the power density can be doubled without changing the design too much, then the cost of electricity will be at least halved. In addition, the confinement time required depends on the power density.
It is, however, not trivial to compare the power density produced by two different fusion fuel cycles. The case most favorable to p–11B relative to D–T fuel is a (hypothetical) confinement device that only works well at ion temperatures above about 400 keV, where the reaction rate parameter <σv> is equal for the two fuels, and that runs with low electron temperature. In terms of confinement time required, p–11B would even have an advantage, because the energy of the charged products of that reaction is two and a half times higher than that for D–T. As soon as these assumptions are relaxed, for example by considering hot electrons, by allowing the D–T reaction to run at a lower temperature, or by including the energy of the neutrons in the calculation, the power density advantage shifts back to D–T.
The most common assumption is to compare the power densities at the same pressure, with the ion temperature for each reaction chosen to maximize the power density, and with the electron temperature equal to the ion temperature. Although confinement schemes can be and sometimes are limited by other factors, most well-investigated schemes have, not surprisingly, some kind of pressure limit. Under these assumptions, the power density for p–11B is about 2100 times smaller than that for D–T. If the device runs with cold electrons, the ratio is still about 700. These numbers are another indication that aneutronic fusion power will not be possible with any mainline confinement concept.
  1. Comparing two different types of power systems involves many factors in addition to the power density. Two of the most important are the volume in which energy is produced in comparison to the total volume of the device, and the cost and complexity of the device. In contrast, the comparison of two different fuel cycles in the same type of machine is generally much more robust.
  2. --Croquant (discuter) 12 août 2008 à 18:22 (CEST)[répondre]

    Références relatives à la fusion hydrogène-bore[modifier le code]

    Une sous-page de discussion de l'article anglais sur la fusion nucléaire fournit des références relatives à la fusion (aneutronique) hydrogène-bore : en:Talk:Nuclear fusion/Annotated bibliography of p-B11 fusion

    --Croquant (discuter) 15 août 2008 à 11:29 (CEST)[répondre]