An Intensity Calibration Method for Grazing Incidence X-ray Microscopy

Abstract

The present invention relates to an intensity calibration method of a grazing incidence X-ray microscope. The method comprises the following steps of: installing each experiment part in a system and performing regulation of the experiment parts to allow the system to achieve an optimal resolution; moving a pin hole diaphragm to measure the emitting spectrum of each field-of-view position; moving out an X-ray microscope from an optical path, and measuring the incident spectrum of the system in each field of view at the rear portion of the aperture diaphragm; employing the measured emitting spectrums and the incident spectrums to perform counting of photons in an energy resolution range, and calculating the object lens reflectivity of each field of view; and employing the object lens reflectivity to calculate the system response efficiency; and according to the system response efficiency of the microscope, the filter disc transmittance and the camera quantum efficiency, calculating and obtaining the source intensity of an implosion pellet. Compared to the prior art, the intensity calibration method of the grazing incidence X-ray microscope considers the consistency of the fields of view, completes the calibration of the optical system energy spectrum response efficiency, and is more suitable for laboratories.

Description

Technical field [0001] The invention relates to the measurement of nuclear radiation or X-ray radiation, in particular to a method for calibrating the intensity of a grazing incidence X-ray microscope, which is suitable for a magnifying imaging system with X-ray multilayer coating on the surface of a mirror. Background technique [0002] In the laser inertial confinement fusion, a large amount of laser energy is converted into X-rays. Through the diagnosis of the emitted X-ray spectrum in the dimensions of time, space and energy spectrum, the state information of the laser plasma can be deduced. Grazing incidence X-ray microscope, in the spatial resolution (5μm) and collection efficiency (10 -6 -10 -8 SR) and other aspects have advantages, and have begun to be used as the main imaging diagnostic equipment in high-power laser devices at home and abroad, and play an important role in the research of fluid dynamics instability growth and implosion compression asymmetry. Common optic...

AI Technical Summary

Problems solved by technology

In previous designs, optical designers paid more attention to the technical indicators used for spatial shape judgment, such as effective field of view, spatial resolution, magnification and distortion, etc., while the transfer function of the system, spectral intensity response efficiency and field of view Issues such as consistency are less discussed

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