20T

The Oxford Instruments 20T system mainly consists of a 20 T central-field 100 mm bore magnet, a special low-loss cryostat, and a third-party UHV dilution refrigeration unit containing the experimental apparatus for STM measurements. The Oxford Instruments 20T magnet is designed as nested concentric solenoids with four Nb3Sn coils surrounded by two outer coils wound from NbTi conductor. The Oxford Instruments 20T uses both Rod-Restack Process wire and Internal Tin wire in the four Nb3Sn coils. The Oxford Instruments 20T magnet is designed to be fully self-protected with diodes and energy-dissipation resistors. The Oxford Instruments 20T cryostat is designed with three layers of vapor-cooled radiation shields, a 205 mm central access neck, and three 76 mm service necks made from 304 stainless steel.^[2]

The Oxford Instruments 20T was developed for low-temperature STM. The Oxford Instruments 20T customer system includes a UHV dilution refrigeration unit containing experimental apparatus for STM measurements. The Oxford Instruments 20T cryostat includes a high-thermal-mass outer radiation shield that can be pre-cooled with nitrogen to lengthen liquid-helium hold time and minimize vibration to STM experiments.^[2]