The working principle of liquid helium cryocondensation pump is strong absorptive force between 4.2k cryogenic surface and gas molecules . the pump has great advantage in large instant pumping speed under high gas load, large working pressure range, high & neat ultimate vacuum 利用4.2k低温面对气体的物理吸附机制实现高气载下瞬时大抽速的液氦低温冷凝泵,具有工作压强范围宽、能获得清洁真空环境的特点。
Liquid helium cryocondensation pump has great advantages in large pumping speed, working pressure range and high ultimate pressure, etc . it's more excellent than any other vacuum pump . it can meet the vacuum requirement of nbi and can improve the transportation efficiency . the development of neutral beam injection ( nbi ) system in the world, the structure of nbi system used on the ht-7 device of asipp was introduced in the thesis 液氦低温冷凝泵是利用低温面对气体有强吸附能力的原理,实现抽气的真空获得设备,它具有抽速大、工作压强范围宽、极限真空度高等一系列优点,是普通真空设备无法比拟的,作为中性束注入系统的主抽泵,它能满足中性束注入系统对大抽速的要求,提高中性束的传输效率。