WEYGBE3
BINP SB RAS, Novosibirsk, Russia
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WEYGBE3 |
New Features of Beamstruhlung Important for Crab-Waist e+e− Colliders | |
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| It is already known that beamstrahlung put a limitation on attainable luminosity of circular high energy e+e− colliders (like FCC-ee and CEPC), it determines beam lifetimes, increase the energy spread and leads to a beam lengthening. Current projects take these effects into account using well known synchrotron radiation (SR) formulas. In this talk I show that these formulas are not applicable for colliders with crab-waist collisions (all new projects of circular e+e− colliders) because at these colliders the deflection angle during the beam collisions θ< 1/γ. In this case the characteristic maximum frequency is ωm ≈cγ2/σ instead of the SR critical frequency ωc≈cγ3/ρ (where σ is the crossing length), the ratio ωm/ωc >1 and the spectrum is completely different. As result all effects due to beamstrahlung are stronger than give standard SR formulas. In the talk results of exact numerical calculation of beamstrahlung spectra for parameter region of e+e− circular collides are presented with analysis and conclusion. | ||
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Slides WEYGBE3 [2.282 MB] | |
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