Cryogenic system is important for the infrared detectors, which can increase the ratio of signal-to-noise at low temperature. Long lifetime, high efficiency mechanical cryocoolers and two-phase heat pipes can reduce the energy consumption of the spacecraft and ensure a low weight. A co-designing cryogenic system consisting of two pulse tube cryocoolers (PTCs) and two neon cryogenic loop heat pipes (CLHPs) operating at temperature around 35 K is designed, manufactured, and tested in the present work. A novel integrated multifunctional heat exchanger is proposed to couple the heat exchange between the cold head of PTC and the condenser of CLHP. To our best knowledge, it is the first time to couple these two technologies directly for space application. The thermal design and efficiency analysis of this cryogenic system are presented, which optimize both the structural layout and insulation to reduce the heat load from surroundings. The thermal performance of the PTCs is ground tested and the co-designing cryogenic system is integrated in a vacuum chamber. The no-load temperatures of the PTCs are 25.3 K and 25.7 K, respectively, while both of the cooling capacities are over 2 W@35 K with the input power of 250 W AC. Meanwhile, the thermal performance of supercritical startup and steady-state operation are tested, and the results are discussed and analyzed.

低温系统对于红外探测器来说很重要，它可以提高低温下的信噪比。长寿命、高效率的机械低温冷却器和两相热管可以降低航天器的能耗并确保低重量。在目前的工作中，设计、制造和测试了一个协同设计的低温系统，该系统由两个脉冲管低温冷却器 (PTC) 和两个在 35 K 左右运行的氖低温回路热管 (CLHP) 组成。提出了一种新型集成多功能换热器，用于耦合PTC冷头和CLHP冷凝器之间的热交换。据我们所知，将这两种技术直接耦合用于空间应用尚属首次。介绍了该低温系统的热设计和效率分析，优化结构布局和绝缘，以减少来自周围环境的热负荷。PTC 的热性能经过地面测试，协同设计的低温系统集成在真空室中。PTC 的空载温度分别为 25.3 K 和 25.7 K，当输入功率为 250 W AC 时，两者的冷却能力均超过 2 W@35 K。同时，对超临界启动和稳态运行的热性能进行了测试，并对结果进行了讨论和分析。而在输入功率为 250 W AC 的情况下，两者的冷却能力都超过 2 W@35 K。同时，对超临界启动和稳态运行的热性能进行了测试，并对结果进行了讨论和分析。而在输入功率为 250 W AC 的情况下，两者的冷却能力都超过 2 W@35 K。同时，对超临界启动和稳态运行的热性能进行了测试，并对结果进行了讨论和分析。