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A pressure test on a liquid-helium vessel with the niobium cavity in a cryostat to the maximum allowable operational pressure is required as the main item for a safety test near 300 K, to prepare for application for a license to operate a superconducting radio-frequency (SRF) module. Because the niobium cavity has a shell structure and is part of the liquid-helium vessel, to prevent its buckling during...
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