  Here we present a high repetition rate, narrow band-width, extreme
ultraviolet (XUV) photon source for time- and angle-resolved photoemission
spectroscopy (tr-ARPES). The narrow band width pulses $\Delta E=9, 14, 18$ meV
for photon energies $h\nu=10.8, 18.1, 25.3$ eV are generated through High
Harmonic Generation (HHG) using ultra-violet (UV) drive pulses with relatively
long pulse lengths (461 fs). The HHG setup employs an annuluar drive beam in a
tight focusing geometry at a repetition rate of 250 kHz. Photon energy
selection is provided by a series of selectable multilayer bandpass mirrors and
thin film filters, thus avoiding any time broadening introduced by single
grating monochromators. A two stage optical-parametric amplifier provides $<
100$ fs tunable pump pulses from 0.65 $\mu$m to 9 $\mu$m. The narrow bandwidth
performance of the light source is demonstrated through ARPES measurements on a
series of quantum materials including the high-temperature superconductor
Bi-2212, WSe$_2$ and graphene.
