X-ray beamlines at the superconducting wiggler of NSRL

To extend the spectral range to hard X-rays, a superconducting wiggler was constructed and installed at the 0.8 Gev storage ring of the National Synchrotron Radiation Laboratory (NSRL) to produce a radiation with the critical energy of 2.55 keV. A wiggler radiation fan of horizontal 35 mrad has been split into three branches to be equipped with three beamlines for studies on extended X-ray absorption fine structure (XAFS), X-ray diffraction and scattering (XRDS) and X-ray deep lithography (LIGA), respectively. The XAFS beamline was commissioned for user operation in the end of 1998. The others have been under construction in the second phase project of NSRL. This article describes the beamline design, the main optical components-focusing mirror and monochromator and the performance test results of the XAFS beamline.