This paper describes the first performance tests and characterization of the detection chain of the Micro-channel X-ray Telescope (MXT), one of the instruments on board the French-Chinese mission SVOM for the study of Gamma-Ray Bursts. The MXT detector consists of a back-illuminated $\text{450}\text{µm}$-thick fully-depleted frame-store silicon pnCCD, operating in the $0.2-\text{10}\text{keV}$ energy range. Featuring an imaging area of $\approx 4{\mathrm{cm}}^2$, the device is read out in parallel by two CAMEX ASICs and is powered and controlled by its dedicated Front-End Electronics. A complete setup based on a cryostat and a multi-energy X-ray source have been designed for the characterization of the detection chain. The tests, performed at $\approx \text{−65}°\text{C}$, demonstrate a spectral resolution of $\text{(82}\pm \text{2)}\text{eV}$ at $\text{1.5}\text{keV}$ as well as a $<\text{200}\text{eV}$ low-level threshold. Both of those results are in compliance with the performance requirements of the instrument.

本文介绍了微通道X射线望远镜（MXT）的首次性能测试和检测链的特性，该探测器是法中两国SVOM进行伽玛射线爆裂研究的仪器之一。MXT检测器包括一个背照式$\text{450}\text{微米}$厚的全耗尽帧存储硅pnCCD，可在 $0。2-\text{10}\text{keV}$能量范围。具有成像区域$\approx 4{\mathrm{厘米}}^2$该设备由两个CAMEX ASIC并行读取，并由其专用的前端电子设备供电和控制。设计了基于低温恒温器和多能量X射线源的完整装置，用于表征检测链。测试在$\approx \text{−65}°\text{C}$，证明光谱分辨率为 $\text{（82}\pm \text{2）}\text{电子伏特}$ 在 $\text{1.5}\text{keV}$ 以及ASA $<\text{200}\text{电子伏特}$低级别的阈值。这两个结果均符合仪器的性能要求。