Bluefors Oy
Arinatie 10
00370 Helsinki
FINLAND
Tel: +358 9 5617 4800
Fax: +358 9 386 7335
VAT: FI 2183 2199
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Cool For Progress
SD Dilution Refrigerator System
Fast Turnaround Dilution Refrigerator
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.
Fully Automated Operation
Single push of a button initiated fully automated cool-down sequence from room to base temperature.
Compact and Effective
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.
Three Access Ports
- 2 x KF40
- 1 x KF25.
Superior Performance
- Base temperature well below 30 mK
- Fast cool-down: < 12 hours to 30 mK.
Temperature Controller
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.
Read more about the Temperature Controller here.
Low Total Cost of Ownership
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.
Options
Optical Ports
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.
Magnetic Shielding
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.
4K Heater Kit
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
Technical Specifications
Note: Cooling power is measured on experimental flange outside MXC.
| SD250 | Guaranteed | Expected |
|---|---|---|
| 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 |
Performance Graphs
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2
3
4
5
6
1
Start cool-down
2
Start pulse pre-cooling
3
Stop pulse pre-cooling
4
Start condensing mixture
5
Stop condensing
6
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.
Typical Layout
Lightweight radiation shields and vacuum enclosure suitable for handling by one person. No lifting tools or crane required.
1
2
1
The Bluefors SD system requires no lab layout or on-site installation.
2
The Bluefors SD is an effective and affordable dilution refrigerator.
Technical Requirements
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.
Contact our sales team for questions, requests and Pre-Installation Guide.