Cryogen-free 3U/4U mixing chiller for generating low temperatures down to 10 mK and for investigating solid-state quantum systems (see service description for more details)

A cryogen-free 3He / 4He mixed cooler for generating low temperatures below 10 mK will be purchased. The mixed cooler must allow the investigation of solid-state-based quantum systems. For this purpose, the mixer cooler must have the technical specifications that enable the experimental investigation of such systems. For this purpose, the mixer cooler must in particular have a sufficiently large sample volume to accommodate the experiments, a sufficiently high cooling capacity and a sufficiently large number of microwave lines. The required technical specifications are listed in the service description.

Exclusion criteria with regard to the technical specifications are:

- the maximum footprint must be smaller than 300 cm x 250 cm, the maximum height less than 330 cm

- to install the system, all parts of the mixing cryostat must fit through a door opening of 2.13m height and 1.6m width; the gas handling system must not exceed dimensions HxWxD = 200cm x 100cm x 153cm.

- the attainable base temperature must be <= 10 mK

- the maximum cooling capacity must be >= 400 µW @ 100 mK

- the sample volume available in the mixing chamber plate area must be >= 290 mm in diameter and >= 320 mm in height

- the system may only have a single vacuum chamber (no additional inner vacuum seals in cold area)

- the delivery time must not exceed 8 months