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At the SILEX-I laser facility, ring coded imaging technique was used to record 2-D Ka source.The coded image is reconstructed by Richardson-Lucy method.From our experimental result, the source is of elliptic shape, with long axis 50 micrometers and short axis 30micometers.The source has been divided into two parts, with resolution better than 10 micrometers.And filamentation is observed too, which can indicate transportation of superthermal electrons in the target.