Denmark – Research, testing and scientific technical simulator – Low vibration, high vacuum cryostat, with vector magnet for SDU

The requested cryogenic system must meet a unique combination of optical, cryogenic, vacuum, vibration, electrical, and future upgrade requirements that are essential for our research. Following a market assessment, only the proposed supplier was identified as capable of providing a fully integrated system meeting all mandatory specifications. 1. Product Specifications Required The system must provide: •At least four lateral optical accesses and one top optical access. •A large cryogenic sample volume of Ø250 mm cold plate × 250 mm height. •Non-magnetic radiation shield with four horizontal and one vertical optical window. •Three integrated 50 A high-current channels to the 4 K stage. •Four thermally anchored coaxial lines for measurements up to 20 GHz. •Four fibre-optic feedthroughs. •48 DC electrical connections at the 4 K cold plate. •Base temperature ≤ 3.5 K with stability better than 50 mK. •Cooling power of at least 250 mW at 4.2 K. •Vibration levels below 30 nm peak-to-peak. •Ultra-high vacuum better than 1 × 10⁻⁹ mbar. •Remote cryocooler architecture with unrestricted 360° optical access. •Future compatibility with a removable 4-1-1 vector magnet. •Complete mobility of the cryostat on the optical table. 2. Why These Specifications Are Necessary •Large 250 mm sample space: Required to accommodate complex optical setups, cryogenic positioners, electrical and fibre connections, and future magnet integration without redesigning the experimental platform. •Ultra-high vacuum (UHV): Our experiments run continuously for several weeks. A vacuum level better than 1 × 10⁻⁹ mbar is essential to avoid contamination of samples and optical windows, ensuring stable measurement conditions and reproducible results over long measurement periods. •Remote cryocooler and ultra-low vibration: Our experiments rely on interferometric and other vibration-sensitive optical measurements. The cryocooler must be physically separated from the optical table to minimise vibration and...