Multiple-energy-point spectrum resolution soft-X-ray framing imaging system

Abstract

The invention provides a multiple-energy-point spectrum resolution soft-X-ray framing imaging system. The imaging system mainly comprises a pin hole array plate, glancing incidence plane mirrors, an optical adjusting mechanism, a filter disc, a light limiting slit, a recording medium and the like. The glancing incidence plane mirrors and the filter disc form an X-ray enable element, each glancing incidence plane mirror and one row of pin holes form an imaging channel, the diameter of each row of pin holes is subjected to optimum design according to observation energy points so as to obtain optimum spatial resolution, and an imaging result is recorded by finally utilizing a time-resolved framing camera or a time-integrated X-ray imaging plate and the like. The imaging system is mainly used for observing laser fusion, Z-hoop condensation polymerization or a high-temperature high-density plasma in a laboratory astrophysical experiment and can obtain plasma evolution images having time resolution, two-dimensional space resolution and spectrum resolution through one-time experiment. Compared with the prior art, the multiple-energy-point spectrum resolution soft-X-ray framing imaging system has the advantages of being low in implementation difficulty, wide in application range, flexible in energy area configuration and good in imaging signal to noise ratio and having a multiple-energy-point imaging characteristic and the like.

Description

technical field [0001] The invention relates to a soft X-ray framing imaging system, in particular to a multi-energy point spectrum resolution soft X-ray framing imaging system based on a grazing incidence plane mirror and its application, belonging to the field of X-ray imaging. Background technique [0002] For inertial confinement fusion driven indirectly, the uniformity of the black cavity radiation field is directly related to the implosion symmetry of the capsule. From the perspective of experimental research, the evolution of black cavity plasma involves two important processes: laser spot movement and cavity wall plasma expansion. They are not only distinct but also related to each other, and both occur near the laser energy deposition area. The movement of the laser spot directly affects the uniformity of the irradiation of the target pellet. The high-speed expansion of the plasma on the cavity wall may preheat or even disintegrate the target capsule in advance, an...

AI Technical Summary

Problems solved by technology

According to the experimental results, there are at least three deficiencies in the current technology: first, the filter method has low transmittance, and the framing camera works in dynamic mode, the obtained image signal strength is weak, the signal-to-noise ratio is poor, and the noise signal is easy to cover up the black cavity An important feature in the plasma evolution process; second, the filter has poor monochromaticity and high-energy X-ray tails, so that the imaging results always contain radiation characteristic information of high-temperature plasma; third, the softer X-ray band (<1keV) The filter is very difficult to manufacture, and the thickness of the filter is usually on the sub-micron level. It is easily damaged by the target disintegration fragments in the experiment, which greatly affects the efficiency of the experiment.

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