Abstract
The characteristics of the electron-photon showers initiated by 2 to 10 GeV electrons aligned along the <111>-axis of tungsten crystals are compared with those for the amorphous tungsten . In this energy range, as known, the positron yield at the optimal target thicknesses is larger in a crystal case only by several percent. However, the amount of the energy deposition in a crystal turns out to be considerably (by 20 - 50 %) lower than in an amorphous target providing the same positron yield, while the peak energy-deposition density is approximately of the same magnitude in the both cases.
Highlights
High energy eeÿ colliders planned to explore physics at a TeV scale will operate at very high luminosities
As known, the positron yield at the optimal target thicknesses is larger in a crystal case only by several percent
The energy-deposition density (EDD) is maximal on the beam axis and increases with the depth
Summary
High energy eeÿ colliders planned to explore physics at a TeV scale will operate at very high luminosities. Corresponding theoretical studies were started with [6] where an analytic solution of the problem was obtained, assuming that energies of all charged particles and photons involved are very high This limitation was surmounted in [7] by suggesting a specific form of the radiation spectrum at axial alignment and performing corresponding simulations. We can rely on our understanding of the physics of shower formation and on numerical results, at least for tungsten crystals in the energy range of incident electrons below 10 GeV. Note that just this energy range is proposed in future linear collider projects The updated version of the code is used to study both crystal and amorphous cases
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