温度梯度对冷冻靶微管充气过程的影响

Effect of Temperature Gradient on Gas-filling Process for Cryogenic Target with Fill-tube

采用基于燃料室和靶室独立控温的温度梯度法开展了冷冻靶微管可控充气技术研究。理论计算结合实验研究了不同尺寸靶球充气过程中温度梯度对燃料注入过程的影响。结果表明,充气结束时燃料室最终温度变化对燃料初始注入量的差值影响随靶球尺寸变化不明显,即通过温度梯度法实现燃料可控注入的途径对任何尺寸靶球均适用。随着靶球尺寸的增大,燃料在充气管处液化时所需温度梯度越小,燃料注入过程温度梯度控制范围越大,燃料注入量控制精度越高。对于内径2 mm的靶球、1.6mL燃料室,当燃料室温度升至75K时,燃料注入量控制精度达±3μm/K。这些结果为冷冻靶燃料高精度加载技术研究提供了重要基础。

The research for gas‐filling technology under control was carried out for cryo‐genic target with fill‐tube ,based on temperature gradient between the fuel reservoir and target cell .The effect of temperature gradient on fuel filling processes with different size targets was studied by theoretical calculation and experiment .The results show that the influence on the initial fill pressure difference is slight with respect to different final temperatures for fuel reservoir .In other words ,it is suitable for gas‐filling process for target with any diameter under control by temperature gradient .One can note that the fuel injectivity is more accuracy for the wide range temperature gradient as the tempera‐ture difference reduction for fuel liquefying ,with the target diameter expansion .The sensitivity within ±3 μm/K for the reservoir at the operation temperature of 75 K is quite adequate for layer thickness control purposes ,with regard to the target at the diameter of 2 mm and the fuel reservoir at the volume of 1.6 mL .These results could afford an important foundation for highly accuracy of fuel injectivity of cryogenic target .