Speaker
Description
Achieving nanometre-scale beam sizes at the interaction point (IP) is one of the key challenges for future linear colliders such as CLIC. This places stringent requirements on the Final Focus System (FFS) and the tuning of the IP beta functions. The ATF2 facility at KEK, Japan, provides a unique testbed for developing and validating ultra-low beta optics, with the goal of reaching beam sizes below the nominal design. To date, the smallest vertical beam size achieved at ATF2 is around 40~nm. Recent upgrades to the facility, including the installation of two new quadrupoles with improved field quality, are expected to reduce aberrations, thus improving beta and beam size performance. Ongoing studies focus on exploiting these hardware improvements and developing advanced tuning algorithms to approach the ultra-low beta regime.
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