BlueFors LD400 Dilution Refrigerator Systems
We have two BlueFors LD400 dilution refrigerator systems that have been configured for electronic, magnetic, and optical measurements of various quantum materials and devices down to 10mK temperatures.
Fridge A: Vector-Magnet Fridge with Free-Space Optical Access
This dilution refrigerator is dedicated to high-precision qubit measurement with our electrons on a solid neon qubit platform. We will leverage the automated gas handling system to develop a rare-gas film deposition process with high film quality. Furthermore, we will build an in-fridge optical scanning probe for the film quality characterization.
Key features:
(1) Cryogenic Capabilities: Base temperature below 10 mK, more than 14 μW cooling power at 20 mK.
(2) Magnetic Field: 1-1-1 Tesla 3-axis superconducting magnet.
(3) Automated Rare-Gas Filling System: 8 stainless steel capillary filling lines for various rare-gases, He gas pressurized cryogenic valves and a homemade gas handling system with an automation system for precise control of the amount of gas sent to the fridge.
(4) Ultrahigh-Quality Wiring for RF Signals: 16 input and 7 output semi-rigid low-noise coaxial lines with 18 GHz maximum frequency, thermalized at each thermal stage in the system by a combination of attenuators, filters, and F/F bulkhead feedthroughs.
(5) Low-Noise DC Wiring: 2*12 thermocoax lines filter high-frequency component and offer high-precision DC and low-frequency measurements. 3*24 twisted pair wiring with micro-D breakout at each stage for biasing cryogenic amplifiers.
(6) Optical Access Ports: 5 optical fibers (single or multi-mode) feed into the mixing chamber through KF40 port on fridge top, 4 optical windows with 12mm clear view for free-space optical access.
Fridge B: Solenoid-Magnet Fridge with Fast Sample Exchange System
This fridge is suitable for quantum devices characterization, such as electrical/magneto transport, resonator characterization, and magnetic properties of materials. In addition to all the capabilities of the first fridge, the second fridge enables an extra fast sample exchange system.
Key features of the fast sample exchange system:
(1) Base temperature below 50 mK.
(2) Fast sample exchange from a bottom load-lock and cool down in less than 8 hours.
(3) Accommodate up to 16 RF and 24 DC connections on a single sample puck.
(4) Compatible with the solenoid magnet which provides up to 9 Tesla field.
Location
304 Nieuwland Science Hall