  Time- and angle-resolved photoelectron spectroscopy (trARPES) employing a 500
kHz extreme-ultravioled (XUV) light source operating at 21.7 eV probe photon
energy is reported. Based on a high-power ytterbium laser, optical parametric
chirped pulse amplification (OPCPA), and ultraviolet-driven high-harmonic
generation, the light source produces an isolated high-harmonic with 110 meV
bandwidth and a flux of more than $10^{11}$ photons/second on the sample.
Combined with a state-of-the-art ARPES chamber, this table-top experiment
allows high-repetition rate pump-probe experiments of electron dynamics in
occupied and normally unoccupied (excited) states in the entire Brillouin zone
and with a temporal system response function below 40 fs.
