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SYND: Neue Detektoren für Strahlen und Teilchen

SYND 1: Symposium Neue Detektoren für Strahlen und Teilchen

SYND 1.2: Plenarvortrag

Mittwoch, 26. März 2014, 14:45–15:30, RW 1

New x-ray detector developments, enabling new photon science — •Heinz Graafsma — DESY, Hamburg, Germany — Mid-Sweden University, Sundsval, Sweden

In order to exploit the full potential of the new photon sources, DESY embarked on a program to develop new X-ray detectors. A brief overview of the ongoing developments will be given.

The main part of the developments is currently driven by the requirements for the Free Electron Lasers where the number of scattered photons per bunch is enough to record a full image, meaning that many photons arrive at the same time, prohibiting photon counting, and leaving integrating detectors as the only alternative. At the same time single photon sensitivity is required.

An additional challenge at the European Free Electron Laser stems from its highly non-uniform time structures with 10 bunch trains per second each containing 2700 bunches (at 4.5 MHz). Finally a very high dynamic range is required for certain imaging experiments, requiring special gain designs. To meet this challenge we are developing, together with the PSI in Switzerland and the Universities of Hamburg and Bonn, the AGIPD-system.

An important part of the science performed at Free-Electron Lasers will be in the soft X-ray range, between 250 eV and 3 keV. This energy range is particularly hard for detectors when signal-to-noise and quantum efficiency are of crucial importance. PERCIVAL is a dedicated project to develop a CMOS based imager with 14 Mpixels, with 120 Hz frame-rate and having single photon sensitivity down to 250 eV.