Scientific Scope 1 ：Traditional high flux ARPES usually can reach a beam spot around 20~50um, which is limited by the beam source size and divergence of the third generation synchrotron. By further reducing the beam spot size to sub microns ,new emergent quantum phenomenon can be visualized.  

Scientific Scope 2 ：High-temperature superconductivity and charge density waves, are dictated by very small energy scales. For instance, a 1 meV resolution enables the direct observation and precise measurement of superconducting gaps, which are often only a few meV in size. Resolving the exact size and momentum dependence of this gap is crucial for understanding the mechanism behind superconductivity.

Scientific Scope 3:  VUV light, with lower photon energy (typically < 11 eV), offers very high momentum resolution and is highly bulk -sensitive. In contrast, higher-energy EUV light (tens to hundreds of eV) can eject electrons from shallower within the material, making it more surface-sensitive. It also allows access to a much wider range of electron momenta, enabling the mapping of electronic bands across the entire Brillouin zone for a more complete, three-dimensional picture.