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DEPFET Sensors for the XEUS Mission

 

 

  DEPFET Sensors for the XEUS Mission  
         
         
  The X-ray Evolving Universe Spectroscopy mission XEUS is going to be a follow-on mission to ESAs cornerstone X-ray spectroscopy mission XMM-Newton. Being a permanent space-borne X-ray observatory as well, XEUS will serve the purpose of studying the evolution of the early hot universe with unprecedented sensitivity, which is going to be a factor of 100 times higher than XMM-Newton. The MPI HLL will contribute significantly to the development of the XEUS payload.   Schematic vertical section of a circular DEPFET pixel cell for XEUS
 
       
      Schematic vertical section of a circular DEPFET pixel cell for XEUS. The pixels have circular geometry for improved charge collection and more efficient filling of area. The pixel size is 75 µm by 75 µm.  
     
  The huge target sensitivity of XEUS is achieved by a combination of newly developed high-quality X-ray mirrors, innovative X-ray detector systems and formation flying techniques allowing for a large focal length. Mirrors and detectors are located on two independent space-crafts carrying the lightweight mirror system with an effective collecting area of about 6 m² at 1 keV and the detector instrumentation, respectively. The current baseline concept foresees a combination of two instruments, a wide field imager (WFI) and a narrow-field imager (NFI).
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Photo of a 64 pixels by 64 pixels DEPFET sensor prototype integrated
onto a ceramics readout hybrid including its required control and readout electronics