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Time- and angle-resolved photoelectron spectroscopy (trARPES) is a powerfulmethod to track the ultrafast dynamics of quasiparticles and electronic bandsin energy and momentum space. We present a setup for trARPES with 22.3 eVextreme-ultraviolet (XUV) femtosecond pulses at 50-kHz repetition rate, whichenables fast data acquisition and access to dynamics across momentum space withhigh sensitivity. The design and operation of the XUV beamline, pump-probesetup, and UHV endstation are described in detail. By characterizing the effectof space-charge broadening, we determine an ultimate source-limited energyresolution of 60 meV, with typically 80-100 meV obtained at 1-2e10 photons/sprobe flux on the sample. The instrument capabilities are demonstrated via bothequilibrium and time-resolved ARPES studies of transition-metaldichalcogenides. The 50-kHz repetition rate enables sensitive measurements ofquasiparticles at low excitation fluences in semiconducting MoSe$_2$, with aninstrumental time resolution of 65 fs. Moreover, photo-induced phasetransitions can be driven with the available pump fluence, as shown by chargedensity wave melting in 1T-TiSe$_2$. The high repetition-rate setup thusprovides a versatile platform for sensitive XUV trARPES, from quenching ofelectronic phases down to the perturbative limit.

A setup for extreme-ultraviolet ultrafast angle-resolved photoelectron spectroscopy at 50-kHz repetition rate