The development of time projection chamber front-end ASIC for the neutron lifetime measurement

We developed a front-end ASIC amplifier of time projection chamber for an experiment to measure neutron lifetime. The precise determination of neutron lifetime is very important to understand the early universe in Big bang nucleosynthesis. The heat generation of frond-end amplifier may become the potential systematic uncertainty in determining the lifetime. In order to overcome this deficit, we have designed an ASIC with low power consumption. The ASIC integrates 8 identical channels, each consisting of pre-amplifier, followed by pole-zelo cancellation circuit, two-step shapers, and analog current buffer. In performances tests, this amplifier features a conversion gain of 1 V/pC, the dynamic range of +- 2 pC, an output width of 0.5 us and a power consumption of 9 mW/ch, which saftisfied the requirement of our experiment.