Characterization results of the JUNGFRAU full scale readout ASIC

Abstract

The two-dimensional pixel detector JUNGFRAU is designed for high performance photon science applications at free electron lasers and synchrotron light sources. It is developed for the SwissFEL currently under construction at the Paul Scherrer Institut, Switzerland. The detector is a hybrid pixel detector with a charge integration readout ASIC characterized by single photon sensitivity and a low noise performance over a dynamic range of 10⁴ 12 keV photons.<br />Geometrically, a JUNGFRAU readout chip consists of 256×256 pixels of 75×75 <em>μ</em>m². The chips are bump bonded to 320 <em>μ</em>m thick silicon sensors. Arrays of 2×4 chips are tiled to form modules of 4×8 cm² area. Several multi-module systems with up to 16 Mpixels per system will be delivered to the two end stations at SwissFEL.<br />The JUNGFRAU full scale readout ASIC and module design are presented along with characterization results of the first systems. Experiments from fluorescence X-ray, visible light illumination, and synchrotron irradiation are shown. The results include an electronic noise of ~50 electrons r.m.s., which enables single photon detection energies below 2 keV and a noise well below the Poisson statistical limit over the entire dynamic range. First imaging experiments are also shown.