The Low Energy X-ray telescope (LE) is one of the three main instruments of the Insight-Hard X-ray Modulation Telescope (Insight-HXMT). It is equipped with Swept Charge Device (SCD) sensor arrays with a total geometrical area of 384 cm and an energy band from 0.7 to 13 keV. In order to evaluate the particle induced X-ray background and the cosmic X-ray background simultaneously, LE adopts collimators to define four types of Field Of Views (FOVs), i.e., 1.6°×6°, 4°×6°, 50°-60°×2°-6° and the blocked ones which block the X-ray by an aluminum cover. LE is constituted of three detector boxes (LEDs) and an electric control box (LEB) and achieves a good energy resolution of 140 eV@5.9 keV, an excellent time resolution of 0.98 ms, as well as an extremely low pileup (<1%@18000 cts/s). Detailed performance tests and calibration on the ground have been performed, including energy-channel relation, energy response, detection efficiency and time response.

中文翻译：

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Insight -HXMT天文学卫星上的低能X射线望远镜（LE）

低能量X射线望远镜（LE）是三个主要手段之一洞察力硬X射线调制望远镜（洞察力HXMT） 。它配备了扫频充电设备（SCD）传感器阵列，其总几何面积为384 cm，能带为0.7至13 keV。为了同时评估粒子诱发的X射线背景和宇宙X射线背景，LE采用准直仪来定义四种类型的视场（FOV），即1.6°×6°，4°×6°，50 °-60°×2°-6°以及被铝盖遮住X射线的被遮盖的那些。LE由三个检测器盒（LED）和一个电气控制盒（LEB）组成，具有140 eV@5.9 keV的良好能量分辨率，0.98 ms的出色时间分辨率以及极低的堆积（<1％ @ 18000 cts / s）。已经在地面上进行了详细的性能测试和校准，包括能量通道关系，能量响应，检测效率和时间响应。