Speaker
Description
The MAX IV 3 GeV storage ring in Lund, Sweden, was the
first implementation of a multibend achromat (MBA) lattice
fourth-generation light source. Since it started delivery of
light in 2016, several succeeding MBA-based rings and vari-
ants have come on-line and many others are being planned,
designed, built or commissioned. All of these capitalize on
the MBA concept and expand it to push the brightness and
coherence performance even further. In order to continue
to offer competitive tools to the Swedish and international
scientific communities beyond the end of this decade, MAX
IV Laboratory launched in 2024 the conceptual design of
MAX 4U, an upgrade of its 3 GeV storage ring with the
goal of an emittance below 100 pm rad. This performance
boost is to be achieved through a minimum-interference
upgrade in which localized interventions in selected subsys-
tems and components are carefully chosen to provide the
maximum performance increase with minimum cost and,
equally important, minimum dark time for the MAX IV user
community. In 2025, the conceptual design report (CDR)
was completed, and the focus in 2026 is to elaborate on the
solutions identified for this upgrade through the Technical
Design Report (TDR), to be completed by the end of 2028.
This contribution describes the latest developments in ac-
celerator physics and engineering aspects of the MAX 4U
design.
Funding Agency
We acknowledge funding from The Crafoord Foundation (Crafoordska stiftelsen) (Grant 20250007).
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