4W1A is an X-ray Imaging beamline located at No.12 experimental hall of BSRF. It is mainly devoted to X-ray Diffraction Enhanced Imaging (DEI) and zone plate based full field Transmission X-ray Microscopy (TXM). As one type of phase contrast imaging method, DEI can get high image contrast from samples, especially for those made up of low-Z elements. The usable energy for DEI is 8~25keV with field of view about 13mm×13mm. TXM runs at large field of view (LFOV) mode and high resolution (HRES) mode at about 8keV with field of view of 65 microns and 15microns respectively. The spatial resolution capability for the instrument is a little better than 50nm with standard test sample (Siemens star pattern) at HRES mode. For real sample, the gettable spatial resolution depends on sample’s contrast. The beamline can also run at white beam mode, with which X-ray topography experiment can be carried out.

This beamline only runs in the dedicated mode of synchrotron radiation.

Research Scopes:

1. Formation mechanism of crystal defects

2. In-situ imaging of materials under load or heating conditions

3. Inner structure of biomedical material and composite material

4. Principle and method research of phase contrast imaging

5. Research of nano-resolution three-dimensional imaging