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Gotthard-II is a charge-integrating microstrip detector developed forexperiments and diagnostics at free-electron lasers using hard X-rays of 5 keV- 20 keV. Thanks to its excellent single photon sensitivity, large dynamicrange as well as high frame rate of 4.5 MHz in burst mode, its potentialscientific applications include X-ray absorption/emission spectroscopy, hardX-ray high resolution single-shot spectrometry (HiREX), beam diagnostics, aswell as veto signal generation for pixel detectors. The Gotthard-II ASIC hasbeen designed and fabricated using UMC-110 nm technology. The final ASIC designand performance in terms of noise, linearity, dynamic range, coupling betweenchannels and speed will be discussed in the paper. In addition, a firstmeasurement of an X-ray absorption spectrum of a standard copper sample hasbeen done. The performance of the Gotthard-II in an experiment using energydispersive X-rays has been demonstrated.

Design and first tests of the Gotthard-II readout ASIC for the European X-ray Free-Electron Laser