...其中包括1064nm连续输出光纤激光器、1064nm脉冲输出光纤激光器、1064nm单频光纤放大器、1550nm连续输出光纤激光器、1550nm迷你型脉冲输出光纤激光器以及氦泵浦（helium pumping）可调谐光纤激光器。
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The Neutral Beam Injection (NBI) system requires a clean high vacuum environment. The liquid helium cryocondensation pump with high pumping speed is an ideal vacuum obtain device.
中性束注入系统要求有洁净的动态高真空环境，大抽速液氦冷凝泵是满足此要求的理想真空获得设备。
Based on vacuum pumping accompanied with throttling process, presenting several superfluid helium cooling cycles and analyzing their flow principle and cooling characteristic.
以抽真空与节流相结合为基础，给出了几种超流氦冷却循环方式；分析了这几种方式的流程机理和冷却特性。
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