Energy is the cornerstone of the survival and development of human society. Laser Inertial confinement fusion (ICF) technology can achieve the controllability of the nuclear fusion process, which makes the tremendous energy available for human. Now, the new generation high power solid-state laser driver has the development tendency of modularization and intelligence. Auto-alignment system is the key part of making the high power solid-state laser driver to work. So the precision and reliability are the key part for the target precision, and they are also the important factor of preventing laser from blocking the hole, improving the near and far laser quality, guaranteeing the system safety. The purpose of the thesis is to realize the CSF far field auto-alignment of SG-II_UP facility, research the key technology of stable alignment extraction image processing algorithm and efficient serial-parallel control on the base of learning the alignment theory, path structure and control system. Main work contents of the thesis include: (1) Learn the alignment theory and path structure of SG-II_UP facility. Master the operating principle of four-pass amplifier system and the feature of CSF far alignment image. Master the operating principle of related hardware including alignment motor, LED light, reflector and software including interactivity layer, algorithm layer and device layer. (2) Aimed that the image of CSF far auto-alignment of SG-II_UP is blurred due to uneven light radiation and has many scattered reference points, propose a method of position estimation and gradient extreme value search. The method can extract the reference rapidly, stably and accurately, and it is adoptable to the light. The method has been used in SG II UP facility. (3) In order to shorten the alignment time, a novel serial-parallel alignment method based on combination of feedforward and feedback control is proposed, which uses Jacobian matrix to calculate the feedback controlled quantity according to the deviation between the laser sport center and the reference center, and uses the couple model between two adjoining pinhole alignment segments to calculate the feed-forward compensation quantity for the disturbance caused by previous segment alignment. The method can shorten the time of CSF far alignment from about 73 seconds to about 32 seconds, and make the alignment much more efficient.
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