The purpose of the tender is to purchase a cryogen free dilution cryostat with magnet.

The system is to be used for experiments at millikelvin temperatures for research in quantum electron transport at Niels Bohr Institute and its Center for Quantum Devices. The system will typically be used for electrical measurements on semiconductor quantum dots, nanowire devices and similar nano-electronic circuits.

This tender is for the cryostat and magnet only; measurement equipment will be built in-house. The laboratory has already experience with dilution cryostats, cryogen-free cryostats, and superconducting magnets.

The system should be of the cryogen-free design with extensive wiring for electrical measurements (incl. high frequency coax lines), space for low-temperature electronics/filtering, a mechanism for rapid sample exchange, and a two- or three-axis (‘vector rotate’) magnet.

The cryostat is expected to operate with a base temperature around 10 mK while also allowing temperature dependences at higher temperatures. The measurements will not dissipate any significant power at low temperature. Frequent sample exchanges are necessary but extended measurement series (months) are also expected. The field of the multi-axis magnet is expected to be at least 3 T and 8 T in two orthogonal directions, respectively.