  The need for larger mK cooling platforms is being driven by the desire to
host ever growing numbers of cryogenic qubits in quantum computing platforms.
As part of the Superconducting Quantum Materials and Systems Center at Fermilab
funded through the Department of Energy under the National Quantum Initiative,
we are developing a cryogenic platform capable of reaching millikelvin
temperatures in an experimental volume of 2 meters diameter by approximately
1.5 meters in height. The platform is intended to host a three-dimensional
qubit architecture based on superconducting radiofrequency accelerator cavity
technologies. This paper describes the baseline design of the platform, along
with the expected key performance parameters.
