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The paper presents a prototype ASIC (CASCA: Charge Amplifier with Switched Capacitor Array) for a TPC based X-ray Polarimeter (XTP). It measures two dimensional photoelectron tracks generated by the incident X-ray photons with one dimensional strip readout. The other dimension is calculated by the drift time from the signal waveform. In order to achieve 100 μm track resolution fine pitch strips are...
A dedicated readout ASIC has been developed for a TPC based X-ray polarimeter. It consists of a charge sensitive preamplifier, a CR-RC shaper and a 64-cell switched capacitor array (SCA) for each channel. The signal charge distribution along the time axis can be extracted from the recorded waveforms. The first prototype has been implemented in two separate chips: the front-end part and the SCA part...
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