High-resolution X-ray spectroscopy with multi-element HPGe- and Si(Li)-detectors and CUBE preamplifiers

Abstract

Future synchrotron experiments will strongly require detectors suited for high-energy photons ( > 20 keV) which have a good position resolution combined with an excellent energy resolution (far below 1 keV [FWHM] depending on the element size and capacitance). SEMIKON has already built several fine-structured Si(Li)- and HPGe-detectors [1], but up to now they were read-out by conventional preamplifiers placed far away from the position elements. Therefore the achieved energy resolution ( ∼ 1.6 keV [FWHM] @ 60 keV) was not suitable for synchrotron applications. To achieve a better energy resolution CUBE preamplifiers (developed by XGLab s.r.l.) were used for the read-out of the detector elements. The CUBE preamplifier was originally developed to work in combination with detectors which have a very low capacitance (e.g. Silicon Drift Detectors). With such detectors it was already shown that a very good energy resolution can be achieved even at high count rates [2,3]. With this work, we will show that CUBE can have a good performance also with detectors having a higher capacitance. We will present the very first results of measurements which were performed with structured planar HPGe- and Si(Li)-detectors (multi-element detectors) in combination with the CUBE ASICs.