  A VUV beamline at SSRF for ARPES measurements are designed. To increase the
resolution and bulk sensitivity, the photon energy as low as 7 eV is desired.
Because the reflectivity for p-polarized photons strongly decreases when the
photon energy is below 30 eV, the design of high flux beamline for low energy
VUV photons is a challenge. This work shows a variable including angle VLPGM
with varied grating depth (VGD) which can achieve both high resolution and high
flux with broad energy coverage.
