Recently, the international commission “ISAB (International Scientific Advisory Board) ELI-RO” analyzed the results of some projects proposed for implementation in ELI-NP. On this occasion, the results were presented
If a strong electrostatic field is applied, it acts on the two charges, doing enough mechanical work to separate the electron and positron so that they no longer annihilate. The minimum energy provided by an electric field to push two particles apart is equal to the energy required to create the masses of two electrons Δε = 2 md in2. In this way, virtual electron-positron pairs are transformed into real pairs, which can then be followed over long distances to detect them. The minimum size of the electric field E which ensures the extraction of electron-positron pairs from the vacuum, the so-called Schwinger threshold, is E-R = 1.323 × 1018 V/ma value so high that it could practically never be obtained in the laboratory.
On the other hand, under the conditions of coherent action of laser electromagnetic waves of high intensity, such high average values of electric and magnetic components can reach close to Schwinger’s critical value. This happens more easily, the higher the power of the laser.
Then, due to the synergistic action of the static electric field (but weaker than the critical value for which the mechanical work qEℓ < 2mc2) together with an electromagnetic oscillating field (weaker, but to produce the extraction of steam from the vacuum, for which the transferred energy ℏω < 2mc2) vacuum breakdown and the creation of electron-positron pairs can be ensured.
Over time, QED interaction processes have been and remain the focus of attention of the most important research centers in the world. Most of these processes, either through a theoretical or through an experimental approach, have been crowned with the Nobel Prize (see Figure 1). Only one process remained without such a crown: the Breit-Wheeler process of photon-photon interaction with the formation of an electron-positron pair.
ELI lasers and new directions of research.
A new approach with a high chance of success is the use of high-power lasers of the ELI (Extreme Light Infrastructure) type.
ELI-ALPS in Szeged (Hungary) used Heisenberg’s uncertainty principle between coordinates and momentum: Δx Δp ≥ ℏ/2 to instrumentalize research to track electron evolution in various processes and materials. Thus, ELI-ALPS has become a very promising tool in the research of attosecond physics, crowned with the Nobel Prize this year.
Similarly, Magurele’s ELI-NP can this time use Heisenberg’s uncertainty principle between energy and time: Δt ΔE ≥ ℏ/2 to study the light-matter transformation, highlighting Breit-Wheeler or Bethe-Heitler processes in a photon. – multiphoton laser interaction, not in linear photons – Breit-Wheeler photon interaction, as in Figure 1.
The feasibility of such processes was confirmed as early as 1997 in the E144 experiment at SLAC (DL Burke, RC Field, G. Horton-Smith, JE Spencer, D. Walz, SC Berridge et al., “Positron Production in Multiphoton Light” – Light Scattering “, Phys. Rev. Lett. 79(9), 1626 (1997), https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.79.1626 (see Figure 2). A laser on neodymium glass with a wavelength of 527 was used here n.m, with a power of the order of terawatts, when interacting with accelerated electrons with an energy of 46.6 GeV. The deficit of laser intensity (energy consumption) was compensated by the use of accelerated electrons that interact with the laser beam. _ c
read the whole article and comment on Contributors.ro
Source: Hot News
James Springer is a renowned author and opinion writer, known for his bold and thought-provoking articles on a wide range of topics. He currently works as a writer at 247 news reel, where he uses his unique voice and sharp wit to offer fresh perspectives on current events. His articles are widely read and shared and has earned him a reputation as a talented and insightful writer.