Optimizing floating guard ring designs for FASPAX N-in-P silicon sensors
  FASPAX (Fermi-Argonne Semiconducting Pixel Array X-ray detector) is being developed as a fast integrating area detector with wide dynamic range for time resolved applications at the upgraded Advanced Photon Source (APS.) A burst mode detector with intended $\mbox{13 $MHz$}$ image rate, FASPAX will also incorporate a novel integration circuit to achieve wide dynamic range, from single photon sensitivity to $10^{\text{5}}$ x-rays/pixel/pulse. To achieve these ambitious goals, a novel silicon sensor design is required. This paper will detail early design of the FASPAX sensor. Results from TCAD optimization studies, and characterization of prototype sensors will be presented. 
Kyung-Wook Shin, Robert Bradford, Ronald Lipton, Gregory Deptuch,   Farah Fahim, Tim Madden, Tom Zimmerman
physics.ins-det