Beamline 3B1B

a VUV beamline in Beijing Synchrotron Radiation Laboratory

was designed for the studies on VUV fluorescence spectroscopy and VUV circular dichroism spectroscopy of biological macromolecules. Due to the very small acceptance and bad vacuum

the beamline didn’t fulfill the experiments well in past years. A new VUV beamline was designed since 2001

the photon wavelength range is from 120nm to 350nm. The beamline’s construction was finished and it was put into use in March 2003. The test result shows its photon flux and resolution are greatly improved. In the paper

design and performance of the beamline is introduced.