Space-resolving flux detection is a novel technique for the precise diagnostic of the radiation field within the hohlraum in inertial confinement fusion. Detailed analysis is made on the geometrical efficiency of the space-resolving flux detector (SRFD), which is of essential importance for the application of the detector for the absolutely localized radiation flux measurement. With the two cascade collimation modules, namely the pinhole and the defining aperture, the field of view of the system could be classified as full-light area and half-light area, within which the solid angles of the point sources with respect to the sensitive detector are different. Therefore, many relevant factors could affect the systematical geometrical efficiency, such as the pattern of the pinhole and the spatial intensity distribution of the radiation source, and the influences of these factors are investigated explicitly. With this method, detailed analysis is made on the experimental radiation flux measured from the Au planar target, with the specific pattern of the pinhole.

With the rapid development of the automobile industry and the increasing requirement of the environmental protection, ultra-high strength hot stamping steel is widely used in body parts of the car. In this paper, the precipitation changes of the second phase particles and CCT curves of 2000 MPa ultra-high strength steel under different austenitizing conditions are studied by the thermodynamic calculations and simulations. The effects of austenitizing temperature, holding time and cooling rate on the quenching transformation behaviors of the steel in the hot stamping process are explored. The microstructure differences on the surface and internal positions of the steel in the austenitizing quenching process are compared and analyzed. The austenitizing process parameters suitable for 2000 MPa ultra-high strength hot stamping steel are formulated, which provides a theoretical basis for the formulation of 2000 MPa ultra-high strength steel in the hot stamping process.