X-ray Performance Evaluation and Vibration Testing of the Wide-Field X-ray Monitor with Lobster Eye Optics

The future satellite HiZ-GUNDAM will be equipped with a wide-field X-ray monitor using Lobster Eye Optics (LEO), covering a wide field of view of ∼ 0.6 steradian in the 0.4–4 keV energy range. LEO, an X-ray optics system, achieves both a wide field of view and high sensitivity by focusing soft X-rays through spherically curved SiO 2 plates with heavy-metal-coated micropores. This design significantly enhances sensitivity by reducing cosmic X-ray background events, outperforming conventional non-focusing detectors. As a prototype, we developed a breadboard frame capable of holding nine LEO segments, aligning them on a single spherical surface to achieve a wide field of view. Given LEO's brittleness, there are concerns about potential damage from launch vehicle vibrations. In addition, the system must be structurally robust, avoiding strong resonances at expected vibration frequencies. To address these concerns, we performed vibration tests simulating launch conditions to assess the structural integrity of the combined LEO and breadboard frame. X-ray performance, particularly angular resolution, was evaluated before and after the tests. The results demonstrate that the system is structurally robust and capable of maintaining imaging performance after simulated rocket launch vibrations.