KAPITZA CONDUCTANCE AND THERMAL CONDUCTIVITY OF MATERIALS USED FOR SRF CAVITIES FABRICATION
KAPITZA CONDUCTANCE AND THERMAL CONDUCTIVITY OF MATERIALS USED FOR SRF CAVITIES FABRICATION
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用于 SRF 腔体制造的材料的 Kapitza 电导率和热导率
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Lesrel
中科院分区：
文献类型：
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作者：
M. Fouaidy;J. Lesrel
研制了一种专用的低温热导率测量装置，用于测量实际用于SRF腔体制作的不同材料的热导率。该设备允许同时测试四个样品。不同材料（Nb板、Ti等）的几个样品在接收时进行测试或/和进行各种热处理（H.T），然后进行测试。另一个测试设施被用来表征不同材料和超流氦在Kapitza制度之间的热传递。Kapitza电阻测量是在几个铌样品上进行的，这些铌样品是未涂覆的或者涂覆有不同材料（Cu、Ti.....）的热喷涂层。在1.5K-2.1K的温度范围内，研究了不同参数如Nb初始纯度（RRR）、在800° C或在1200 ° C下用Ti吸杂进行Nb热处理、Nb和/或涂层表面制备和处理对热导率和Kapitza电导率的影响。我们还报告了涂层对Kapitza电导的影响。最后，我们的实验数据进行了比较，以前报道的结果和涂层上的SRF腔的最终RF性能和热稳定性的影响进行了讨论。
A dedicated apparatus was developed for measuring at low temperature the thermal conductivity of different materials actually used for the fabrication of SRF cavities. This device allows the test of four samples simultaneously. Several samples of different materials (Nb sheets, Ti…) were either tested as received or/and subjected to various Heat Treatment (H.T) then tested. Another test facility was used for the characterization of heat transfer between different materials and superfluid helium in the Kapitza regime. Kapitza resistance measurements were performed on several niobium specimen either uncoated or coated with thermally sprayed layers of different materials ( Cu, Ti .....) in the temperature range 1.5 K - 2.1 K. The influence of different parameters such as Nb initial purity (RRR) , Nb heat treatment at 800° C or at 1200 ° C with Ti gettering , Nb and/or coating surface preparation and treatment on both thermal conductivity and Kapitza conductance was investigated. We report also the effect of the coating on Kapitza conductance. Finally, our experimental data are compared to results previously reported and the effect of the coating on the SRF cavities ultimate RF performance and thermal stability is discussed.