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Description
Commissioning of the storage ring of SLS 2.0 started in January 2025. All design machine parameters including the nominal current of 400 mA were achieved by beginning of April 2025. First light was delivered to two dipole beamlines a few days later. The ~3-month commissioning took the SLS 2.0 project ahead of the already aggressive schedule targeted by the technical design report in 2021. The 7-bend achromat lattice relies mostly on small aperture permanent magnets with tight specifications and a very dense arrangement leading to significant cross talk between magnets which had to be addressed at the design stage. A large number of weak dipoles, (skew) quadrupoles and octupole correctors provides the necessary linear and nonlinear correctability of the machine. The quick commissioning of the fast orbit orbit feedback made it feasible to schedule 1st user operation in July just before the inauguration event in August. At the same time a complete final vertical realignment with stored beam was carried out utilizing the remote-control capability of the magnet girders. Meanwhile 6 including 2 new insertion devices have been characterized, and beam is regularly provided to 12 beamlines. The machine protection system in conjunction with the dedicated beam dump keeps the operation with permanent magnets safe. At the end of November SLS 2.0 has entered its first external user service until it breaks for a ~5-month shutdown in December for phase #2 installation.
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