München 2009 – scientific programme

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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.