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Some experimental tests for vacuum seals have been performed on different flanges in order to understand their behavior at cryogenic temperature. Taking into account the reliability of cryogenic seals and the knife edge of ConFlat flange probable becoming brittle after 950 ℃ vacuum baking, the groove flanges applied diamond shaped gasket for seals have been determined to be as our SRF cavities cold flanges. Leak test procedure of different stainless steel flanges at 77k is shown in Fig.1.
Some experimental tests for vacuum seals have been performed on different flanges in order to understand their behavior at cryogenic temperature. Taking into account the reliability of cryogenic seals and the knife edge of ConFlat flange probable to become brittle after 950 ℃ vacuum baking, the groove flanges applied Leak test procedure of different stainless steel flanges 77k is shown in Fig.1.