The continuous advancement of accelerator-based x-ray sources has and will continue to enable new scientific opportunities. To exploit these capabilities a correspondent advancement in detector technology is necessary. FLORA (Fermilab-LCLS CMOS 3D-integRated detector with Autogain) is a large dynamic range hybrid pixel detector with continuous, fast readout rate. The detector comprises a Monolithic Active Pixel Sensor (MAPS), for very low noise and high sensitivity, and a readout ASIC with in pixel Analog-to-Digital converter (ADC), for fast readout. Advanced interconnects will be used to implement the density required for the signals processing. Originally conceived to exploit the high repetition rate operation at LCLS-II with focus on soft X-rays, FLORA can fulfill the needs of the new storage rings and its concept extended to tender and harder X-rays. The current development aims to achieve single photon sensitivity at low energy (250 eV) with a dynamic range of 104 photons per pixel per frame and a readout rate of more than 10 kframes/s.

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