The critical electric field of gas mixtures over the extended range of cryogenic operating conditions
The critical electric field of gas mixtures over the extended range of cryogenic operating conditions
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在扩展的低温操作条件范围内气体混合物的临界电场
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
L. Graber
中科院分区：
文献类型：
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作者：
Chanyeop Park;S. Pamidi;L. Graber
在这项研究中，我们提供了低温气体混合物在低温温度和低温压力范围内的临界电场和介电强度，该范围涵盖了超导应用的大多数操作条件。对于气冷低温系统，在运行过程中不能发生冷凝。为了防止冷凝，我们通过考虑低温应用的操作条件，确定了由低温气体混合物组成的气体种类的最大允许摩尔分数。随后，我们用两项近似法求解玻尔兹曼方程得到的密度缩减临界电场（(E / N) cr）来估计混合气体的介电强度。利用（E / N） cr的值，我们计算了在1.0 ~ 2.0 MPa的压力下，在10 ~ 100 K的扩展低温工作范围内的临界电场（Ecr）。结果表明，低温气体混合物的介电强度随温度的变化而变化。
In this study, we provide the critical electric field and dielectric strength of cryogenic gas mixtures over an extended cryogenic temperature and pressure range that covers most of the operating conditions of superconducting applications. For gas-cooled cryogenic systems, condensation must not occur during operation. To prevent condensation, we determine the maximum allowed mole fractions of gas species consisting cryogenic gas mixtures by accounting for the operating conditions of cryogenic applications. Subsequently, we estimate the dielectric strength of the gas mixtures in terms of the density-reduced critical electric field ( ( E / N ) c r), obtained by solving the Boltzmann equation with the two-term approximation method. Using the values of ( E / N ) c r, we calculate the critical electric field (Ecr) over the extended cryogenic operation range of 10–100 K at pressures between 1.0 and 2.0 MPa. The results show that the dielectric strength of cryogenic gas mixtures varies as a function of temperatu...