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T: Fachverband Teilchenphysik
T 65: Detektorsysteme 1
T 65.1: Talk
Wednesday, March 11, 2009, 16:45–17:00, N020
Adaptive Gain Integrating Pixel Detector for X-ray Free Electron Laser — •Riccardo Mazzocco, Hans Krüger, and Norbert Wermes — Bonn Universität, Nußallee 12, 53115 Bonn, Germany
The European XFEL is a project aiming at the construction of a large scale X-ray Free Electron Laser. This photon source will produce very short coherent photon pulses (100 fs) at a repetition rate of 5 MHz. The pulses are sent in trains of bunches separated by a time interval of approximately 99 ms. The full machine will be composed of a 2.1 km long LINAC accelerating electrons up to 17.5 GeV, an undulator forcing the electron beam to generate the X-ray laser and a Hybrid Pixel Array Detector.
This Detector, based on the Hybrid Pixel technology, consists of 1 million pixels with the size of 200×200 µm2. Each pixel will contain an adaptive gain integrator which has been proposed to cover the extremely wide range from single photon detection up to 104 12 keV photons, as well as an analog pipeline for frame storage at the repetition rate of the XFEL. The design of the analog pipeline has to be optimized to achieve a leakage current value of less than 1 fA for the sampling cells of the pipeline, in order to avoid the degradation of the sampling signal values during the time they are stored. Such a tough requirement can be met by testing the performances of the chosen technology first and by employing a low leakage topology of the sampling switches and capacitors. Several results of the testing as well as preliminary simulations of the analog pipeline are presented.