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Added crab waist transformation at the IP.

This is a transformation of the y and px particle coordinates. The formulas derive from the sextupole Hamiltonian of the "crab-sextupole" that is used to implement the crab waist scheme at the FCC-ee. The transformation is applied in the AddParticles.cpp file in the lab frame, before the beam rotation.

Needs unit tests.

@RemiLehe RemiLehe requested a review from aeriforme November 25, 2025 23:34
@aeriforme aeriforme changed the title add crabwaist [WIP] Add crabwaist Nov 26, 2025
@aeriforme aeriforme added enhancement New feature or request component: initialization Changes related to the initialization of the simulation labels Nov 26, 2025
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component: initialization Changes related to the initialization of the simulation enhancement New feature or request

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