Investigation of the geometrical efficiency for the two-dimensional space-resolving flux detector in inertial confinement fusion

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.