Investigation of vacuum properties of CuCrZr alloy for high-heat-load absorber

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• 作者：C. Shueh ; ^{Shueh.C@nsrrc.org.tw" class="auth_mail" title="E-mail the corresponding author} ; C.K. Chan ; C.C. Chang ; I.C. Sheng
• 关键词：Thermal desorption ; Copper alloy
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：841
• 期：Complete
• 页码：1-4
• 全文大小：645 K

文摘

The Taiwan Photon Source (TPS) uses high-heat-load (HHL) absorbers to protect downstream ultrahigh-vacuum chambers from overheating. In this work, we propose to use the CuCrZr alloy (ASTM C18150) for the HHL absorber body and the ConFlat^® flanges. We use the throughput method to measure the thermal outgassing rate and a helium leak detector to verify the vacuum seal between the CuCrZr alloy and stainless-steel flanges. The measured outgassing rate of the CuCrZr alloy was 5.8×10⁻¹⁰ Pa m/s after 72 h of pumping and decreased to 2.02.0-S016890021631052X&_mathId=si0007.gif&_user=111111111&_pii=S016890021631052X&_rdoc=1&_issn=01689002&md5=a6169ab7abb790a08f8666f1da1a92eb" title="Click to view the MathML source">×$\times$10⁻¹⁰ Pa m/s after 100 h of pumping. The leak rate through the vacuum seal between a CuCrZr flange and a stainless-steel flange was less than 12.0-S016890021631052X&_mathId=si0008.gif&_user=111111111&_pii=S016890021631052X&_rdoc=1&_issn=01689002&md5=91edae8e589ca092feef61d2f5682e6f" title="Click to view the MathML source">×$\times$10⁻¹⁰ Pa m³/s even after mounting and unmounting the flanges ten times and baking them at 250 °C. These results indicate that CuCrZr alloy is suitable for integrating HHL components with ConFlat^® CuCrZr flanges for the absorption of the synchrotron radiation generated by the TPS.