ePixHRM320k- A Detector System for Soft X-ray Imaging for LCLS-II

• Main Authors: Doering, D., Rota, L., Pena-Perez, A., Markovic, B., Gupta, A., Alnajjar, D., Ruckman, L., Geranen, D., Oriunno, M., Hansson, C., Segal, J., Kenney, C., Dragone, A.
• Format: Conference Proceeding
• Language: English
• Subjects: Cooling; Free electron lasers; Microwave integrated circuits; Prototypes; Semiconductor detectors; X-ray imaging; X-ray lasers
• ISSN: 2577-0829
• DOI: 10.1109/NSSMICRTSD49126.2023.10337887

LCLS-II, a Free Electron Laser (FEL) X-ray light source, operating at SLAC National laboratory, includes experiments with x-rays exploring energies in the soft x-ray regime (250eV to 1600 eV). A full frame detector with 320k pixels capable of sustaining readout rates higher than 5,000 frames per second called ePixHRM has been proposed for this type of application. The ePixHRM is composed of two ASICS, where the sensor includes active pixel circuitry, thinned to 200um and back processed to include a thin entrance window. The sensor is bump bonded to the readout ASIC which includes 4 rows of 192 ADCs, configuration logic using a custom interface called SACI and readout circuitry that transmits data serially to an associated FPGA system. To complete the detector active cooling and mechanics has been designed to enable the detector to be installed in a rotating arm inside a vacuum experimental chamber. Initial results from the prototype sensor/ASIC module are already available they are reported.