How to win: Dry dilution refrigerator with anti-vibration system for mK scanning probe microscopy

About this contract

NPL is seeking a solution for a new dry dilution refrigerator (“the system”) in which scanning probe microscopy experiments will be carried out at mK temperatures on live superconducting quantum circuits. NPL wishes to use the system for atomic scale scanning tunnelling microscopy and atomic force microscopy. As such, the system must provide a low vibration and high coherence environment (light tight mixing chamber volume). Significant emphasis will be placed on the lowest possible vibration levels that can be achieved. It is anticipated that a solution provides both a mK vibration isolation system and various vibration mitigation measures at room temperature. The scope includes the dilution refrigerator having a low-vibration experimental platform at mK temperature, the experimental wiring tree to the mK experimental platform, and any room-temperature or low-temperature vibration reducing measures, any gas handling system, vacuum pumps or electronics required to operate the system. The system does not include the scanning probe microscopy unit itself, this will be provided and integrated by NPL. In the below we denote “the mixing chamber plate” as the standard plate of the dilutio

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