The Design And Test Of Ellipsoidal Glass Capillaries As Condensers For X Ray Microscope

For the penetrating power of X-rays and imaging something likes soft tissues without contrast media and/or a serious dose, three dimensional (3D) phase-contrast X-ray imaging has been widely used in medical radiology, material science, and industrial radiography et al. Utilizing transmission X-ray microscope (TXM), A high resolution X-ray microscope endstation was constructed on a wiggler beamline at the National Synchrotron Radiation Laboratory (NSRL). By analyzing the characteristics of micro-focusing optics for X-ray, ellipsoidal glass capillary was chosen as condenser. Parameters of the ellipsoidal glass capillaries (Xradia, USA) as condensers were calculated and designed based on the illumination requests in the X-ray microscope system. Performance of the ellipsoidal glass capillaries was tested. The results indicate that the beam size agrees with the designed parameters and focus efficiencies of the ellipsoidal glass capillary condensers are also perfectible.The main works in the thesis are described as the following:1. Summarized X-ray microscope and micro-focusing optics for X ray. New research fields in X-ray microscope were introduced: phase-contrast X-ray imaging and computer Tomography for 3D imaging. According to the differences and applications of 3 kinds of micro-focusing optics for X-ray, ellipsoidal glass capillary was chosen as condenser.2. Four ellipsoidal glass capillaries were designed. The principles were followed: (1) to image the x-ray source with an ellipsoidal reflector, the source and the focus must be located at the two focal points of the generating ellipse. (2) The numerical aperture (NA), output range of illumination angles, of the condenser should match the NA of the microscope objective lens for best resolution and performance.3. Four ellipsoidal glass capillaries were tested. The focal spot size and the x-ray collection efficiency are important parameters to characterize the performance of the condenser. According to the X-ray microscope endstation of NSRL, original experiments were designed to test the focal spot size and the x-ray collection efficiency. The results indicate that the beam size agrees with the designed parameters and focus efficiencies of the ellipsoidal glass capillary condensers are also perfectible.