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Improved Dilution Refrigerator for Scanning Tunneling Microscopy
Other novel features incorporated in the SAIT system include:
* Comprehensive UHV compatible wires and coaxial cables are installed to fit the user’s special applications.
* User-friendly mechanical heat switch is installed for fast pre-cooling of the DR stage.
* Multiple shutters are assembled to block the infra-rad radiation heat load.
* Based on the experience from the NIST system, the SAIT system used a Joule-Thomson (JT) stage for mixture condensation along with the 1K pot.
* Janis automated gas handling system (GHS2) with oil-free Roots pumping station.
The SAIT system has been successfully installed on site and reached the following performance specifications:
* The mixing chamber has reached a base temperature of 6.6 mK per the CMN sensor calibrated with the fixed superconducting point device (FPD).
* More than 300 µW @ 100 mK cooling power has been achieved.
* The solenoid has reached maximum magnetic field of 15.5 T @ 4.2K with DR at base temperature.
* To prove ULT STM performance and atomic resolution, the user has been studying graphite and graphene only so far. A “standard”
The user has disclosed, “We now have a UHV ultralow temperature scanning probe microscope working with a base temperature of 6.6 mK and the maximum magnetic field of 15.5 T.”