Speaker
Description
Korea-4GSR is a new 4 GeV synchrotron light source under construction since 2021, targeting ultralow emittance performance of 60 pm rad. To reach this regime, the lattice uses a hybrid multi-bend achromat (HMBA) configuration, which increases the number of magnets per cell resulting in magnetic cross-talk. The short magnet spacing may degrade field quality, perturbing particle orbits and enhancing nonlinear effects in beam dynamics. 3D finite-element simulations were performed for all magnet pairs in the ring, and no meaningful cross-talk was identified in most configurations. Magnet pairs involving dipoles, however, can alter the bending strength and thus directly impact the beam trajectory, necessitating focused evaluation. For these dipole pairs, we performed both simulations and magnetic measurements and demonstrated that a field-clamp effectively suppresses the residual cross-talk. This poster highlights the mitigation capability of the field-clamp approach.
| Paper status | Proceeding files received |
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