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NSLS-Ⅱ,the successor to NSLS(National Synchrotron Light Source)at Brookhaven National Lab,has been open to users worldwide since early 2015 as a world-class advanced synchrotron light source because of its unique features: its half-milecircumference(792 m)Storage Ring provides the highest beam intensity(500 mA)at medium-energy(3 GeV)with sub-nm-rad horizontal emittance(down to 0.5 nmrad)and diffraction-limited vertical emittance at a wavelength of 1(A)(<8 pm-rad).