<p>➀ European XFEL upgrades its accelerator with the new GUN5 electron source for enhanced X-ray laser performance；</p><p>➁ GUN5 significantly improves electron bunch density, enabling more stable and efficient X-ray flashes to advance scientific research in fields like chemistry and quantum materials；</p><p>➂ The extended high-frequency pulse length by 30% allows for 36,000 light flashes per second, boosting experimental data collection and versatility.</p>