We have developed a dedicated front-end electronics board for a high-pressure xenon gas time projection chamber for a neutrinoless double-beta decay search. The ionization signal is read out by detecting electroluminescence photons with silicon photomultipliers (SiPMs). The board reads out the signal from 56 SiPMs and records the waveforms at 5 MS/s with a wide dynamic range up to 4000 photons/200 ns. The SiPM bias voltages are provided by the board. Fine adjustment of the bias voltage for each channel is realized while keeping the dc coupling readout constant, which is indispensable for readout of microsecond-long pulses or at high rate environment. Additional analog-to-digital converters (ADCs) measure one photon-equivalent dark current for calibration and monitoring of the SiPM. The obtained performance satisfies the requirement for a neutrinoless double-beta decay search.

中文翻译：

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用于无中微子双β衰变搜索的 SiPM 读出气态 TPC 的前端电子设备

我们开发了一个专用的前端电子板，用于高压氙气时间投射室，用于无中微子双β衰变搜索。通过用硅光电倍增管 (SiPM) 检测电致发光光子来读出电离信号。该板从 56 个 SiPM 读出信号并以 5 MS/s 的速度记录波形，动态范围高达 4000 光子/200 ns。SiPM 偏置电压由电路板提供。在保持直流耦合读出恒定的同时实现了每个通道的偏置电压的微调，这对于微秒长脉冲或高速环境的读出是必不可少的。额外的模数转换器 (ADC) 测量一个光子等效暗电流，用于校准和监控 SiPM。