KATRIN DPS2-F差动泵送段的气体流量折减系数的测量
Measurement of the gas-flow reduction factor of the KATRIN DPS2-F differential pumping section
摘要：
KATRIN实验的第二前向差分泵送部分（DPS 2-F）的气体流量减少因子是使用专用的真空测量装置和DPS 2-F束管和测量装置的详细分子流模拟来确定的。在测量中，使用非放射性测试气体氘、氦、氖、氩和氪，输入气体流量由商业质量流量控制器提供，并且使用残余气体分析仪测量输出流量，以将其与除气背景区分开。对于质量为4的气体，在室温下用空束管测量的减少因子为1.8（4）E4，这与模拟值1.6E4非常一致。基于涡轮分子泵入口法兰处捕获因子的内插值，氚的模拟减少因子为2.5E4。相对于1 E5的设计值的差异是由于自初始设计以来射束管几何形状的修改，并且可以通过减小有效射束管直径来部分恢复。
英文摘要：
The gas-flow reduction factor of the second forward Differential Pumping Section (DPS2-F) for the KATRIN experiment was determined using a dedicated vacuum-measurement setup and by detailed molecular-flow simulation of the DPS2-F beam tube and of the measurement apparatus. In the measurement, non-radioactive test gases deuterium, helium, neon, argon and krypton were used, the input gas flow was provided by a commercial mass-flow controller, and the output flow was measured using a residual gas analyzer, in order to distinguish it from the outgassing background. The measured reduction factor with the empty beam tube at room temperature for gases with mass 4 is 1.8(4)E4, which is in excellent agreement with the simulated value of 1.6E4. The simulated reduction factor for tritium, based on the interpolated value for the capture factor at the turbo-molecular pump inlet flange is 2.5E4. The difference with respect to the design value of 1E5 is due to the modifications in the beam tube geometry since the initial design, and can be partly recovered by reduction of the effective beam tube diameter.
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