© Copyright 2019 — Bluefors Oy
Cool For Progress
To create a fast turn-around cryogenic refrigerator, we revived the form factor of our first cryogen-free dilution refrigerator measurement system. The SD system requires no lab layout or on-site installation, and with the reduced step heat exchanger stage the required amount of helium-3 is only 12 liters, making the system an effective and affordable alternative. SD dilution refrigerator measurement system typically provides cooling power > 250 μW when operated at 100 mK with only 12 liters of helium-3.
Single push of a button initiated fully automated cool-down sequence from room to base temperature.
MXC Flange Diameter: 150 mm | 6″
The experimental space beneath the mixing chamber (no magnet) is 148 mm in diameter and up to 300 mm in height. The height can be easily adapted to suit your experimental requirements. The dilution unit is positioned off-center to provide maximum useful experimental space on all flanges.
The Bluefors Temperature Controller enhance the user experience of our cryogenic systems. With a modern and intuitive user interface, you gain direct control and overview of the system’s temperature status.
The Bluefors Temperature Controller is fully-integrated to all dilution refrigerator measurement systems.
Oil-free pumps and compressors in gas handling unit guarantee minimal maintenance requirements with service interval up to 3 years. The systems employ only high-quality components such as Pfeiffer Vacuum pumps and pressure sensors, VAT vacuum valves and bellows.
We offer direct optical access to the sample space. The optical ports can be equipped with different window materials and are available in different sizes and configurations.
We offer magnetic shielding that can be fitted directly to the system (e.g. a magnetic shielding metal cylinder with one end closed inside the lower section of the vacuum can). For magnetic shielding we work together with Amuneal Manufacturing Corp.
Fully automated fast warm-up option, which allows overnight warm-up for our standard SD systems.
Service Packages and Extended Warranty are available upon request
Note: Cooling power is measured on experimental flange outside MXC.
|Base temperature||30 mK||25 mK|
|Cooling power @ 100 mK||250 μW||275 μW|
|Cooling power @ 120 mK||360 μW||400 μW|
|Cool-down time to base||12 hrs||11 hrs|
Start pulse pre-cooling
Stop pulse pre-cooling
Start condensing mixture
Normal circulation mode
Above is a typical cool-down curve for a SD system measured with a calibrated resistance thermometer.
Pulse pre-cooling sequence (see spots 2 and 3) is one of the key points in reducing the cool-down time. Because we do not use exchange gas some parts of the DR unit stay ‘hot’ on cool down, which prevents condensation of the mixture. By repeatedly admitting the mixture from the tanks through the low impedance still-side of the DR and then pumping it out again, these hot spots are effectively cooled down.
Lightweight radiation shields and vacuum enclosure suitable for handling by one person. No lifting tools or crane required.
The Bluefors SD system requires no lab layout or on-site installation.
The Bluefors SD is an effective and affordable dilution refrigerator.
The basic requirements are 3-phase electricity, cooling water, compressed air. The full list of requirements and specification details can be found in the Pre-Installation Guide, please contact our sales team for a copy.