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Controlled Drift Detectors and Linear Drift Detectors



  Controlled Drift Detectors and Linear Drift Detectors  
  The MPG initiative “Center for Free Electron Laser Studies” (CFEL) has jointly been established by MPG, DESY and the University of Hamburg. Next generation brilliant X-ray sources require new instrumentations for two-dimensional images produced in the scattering processes. Being an integral part of the new scientific infrastructure, the MPI HLL is responsible for the two-   Schematic of an electric potential of a LSDD as planned for the XFEL facility  
  dimensional beam line instrumentation.    
  The first lasers to be equipped with silicon detectors made by MPI HLL are the new Free Electron Laser ( To the FLASH website FLASH) facility in Hamburg and the Linac Coherent Light Source ( To the LCLS website LCLS) facility in Stanford. The European Free Electron Laser ( To the XFEL website XFEL) at DESY will be ready for data taking in 2013 with an innovative detector concept based on the linear silicon drift detector (LSDD).  
  The linear silicon drift detector as indicated in the potential simulation of the figure on the right is composed of linear drift columns all operated in parallel. At the end they are fed in an amplifier structure for signal processing. As the arrival time of the X-rays is known from the bunch crossing of the accelerator we only need to measure the arrival time of the generated electrons and their amplitude. The arrival time tells us how long the electrons were drifting in a well known electric field and help us to calculate the conversion position of the incident X-rays. In case the energy of the X-rays is known, as applies to the synchrotron applications, the measured amplitude gives us the precise number of X-rays which have been hitting the detector.
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Lizard X-ray image taken with
an experimental LSDD at the synchrotron in Trieste with 100,000 frames per second (Courtesy Castoldi et al.)