Cryostat lid

We are seeking a technology provider for the design and manufacture of a cryostat lid (600-700 mm diameter for a cryostat length of about 3 m to test coils of about 2 m length) for a superconducting undulator measurement stand at European XFEL. Key highlights: - Extremely stringent helium leak tightness ≤ 1×10⁻⁹ mbar l/s - Structural requirements to support up to 800 kg of undulator coils and frame. - Use of certified cryogenic materials (1.4541 / 1.4571 stainless steel, aluminum shields) - Design to withstand 4 K operations in liquid helium, with design pressure up to 2.0 bar abs and test pressure at 2.5 bar abs. - Integration of: - High-current leads: 1500 A main, plus up to 12 x 20 A correction leads ( 2 kV insulation), with intermediate cooling stage to minimize 4 K heat load . - multilayer insulation (MLI) on the different thermal shields - Multiple instrumentation feedthroughs, e.g. hermetic connectors for ~120 sensor wires and voltage taps rated with 2 kV insulation. - DN100CF flange for a linear motion system and three DN40KF/DN100KF flanges for cryogenic instrumentation. - Compliance with PED 2014/68/EU (Category III) and AD 2000 regulations is mandatory.