LD System
Dilution Refrigerator Measurement System
The LD System is our most sold dilution refrigerator measurement system. Its versatility makes it suitable for many different experimental needs. Now available also in a side-loading configuration.
The LD System has the largest amount of available options and different magnet configurations that allow it to be customized for different experiments and uses.
The LD450 system provides more than 14 μW at 20 mK on the experimental flange with only 18 liters of helium-3. In addition, it has a high guaranteed cooling power of > 450 μW when operated at 100 mK.
There is now a new LD System configuration with side-loading ports. The LD450sl System includes 2 side-loading ports to enable the simple and convenient installation of our side-loading wiring.
This well-engineered dilution refrigerator measurement system has a clean and open design for installing measurement equipment. A single push of a button initiates a fully automated cooldown sequence from room to base temperature.
Product Highlights
1.0
LD
Dilution Refrigerator Measurement System
Fully Automated Operation
Push-button, fully automated cooldown sequence from room to base temperature.
Enhanced Cooling
We have developed a solution to optimize the integration of pulse tube cryocoolers in our dilution refrigerators to increase their cooling performance. This redesigned integration results in a significant increase in cooling power at the 4K flange. The improved pulse tube cryocooler integration also makes it possible to operate the 4K flange at a higher temperature without affecting the dilution unit. Elevated 4K flange temperatures generate a significant increase in available cooling power.
Extensive Capabilities for Experimental Wiring
The system features a variety of access ports for experimental wiring between the Room Temperature and the Mixing Chamber Flange. There are two different port configurations for the LD System, the classic ISO-K63 configuration for the LD350 and LD450 systems, and the new LD450sl with two side-loading ports.
The side-loading ports in the LD450sl also make it possible to install our High-Density Flex Wiring (FPC) and High-Density Wiring options in the LD. The side-loading feature is particularly beneficial for complex experiments with higher payloads, or quantum applications with a large number of qubits in a compact cryostat. There is also an increased number of heat switches to optimize and speed up the cooldown process of the loaded system.
Our side-loading measurement infrastructure options are also 100% compatible with our XLD systems, making the LD450sl the ultimate testing system with interchangeable wiring across LD and XLD systems. The side-loading feature makes it easy to assemble and maintain large wiring infrastructures. Assembly can be prepared on a workbench while the system is running, and immediately exchanged when the system reaches room temperature.
ISO-K63 Configuration
- 2 x ISO-K63 slotted in all flanges
- 5 x KF40 including central port
Side-loading Configuration
- 2 x LOS side-loading ports slotted in all flanges
- 4 x KF40 ports
Large Experimental Space
Mixing Chamber Flange Diameter: 294 mm | 11.42″
The off-center placement of the dilution unit maximizes useful space on all flanges. An open design permits easy experiment access without heat exchangers or the system support structure getting in the way.
Superior Performance
- Base temperature below 10 mK
- Fast cooldown: < 24 hours to 10 mK (measured on an empty system with standard experimental space and shield set).
- Cooling power: >450 µW at 100 mK
Temperature Controller
The Bluefors Temperature Controller enhances 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.
Low Total Cost of Ownership
The oil-free pumps and compressors in the Gas Handling System guarantee minimal maintenance requirements with a service interval of up to 3 years. The systems contain only high-quality components such as Pfeiffer Vacuum pumps and pressure sensors, VAT vacuum valves and bellows.
Questions About the LD System? Find answers faster.
Technical Specifications
2.0
LD
Dilution Refrigerator Measurement System
Pulse Tube Cryocooler Configurations
3.0
LD
Dilution Refrigerator Measurement System
Dilution Refrigerator Model
LDsl System 3D Interactive Model
This interactive 3D model of our LDsl System lets you explore our dilution refrigerators. Step inside the system, examine its components, and see how each one plays a role in the cooling process.
From stage to stage, you can follow how the system is engineered to reach and maintain ultra-low temperatures.
Options
4.0
LD
Dilution Refrigerator Measurement System
Performance Graphs
5.0
LD
Dilution Refrigerator Measurement System
Above are cooldown curves for three different configurations of LD systems measured with calibrated resistance thermometers.
- System 1: basic LD with LN2 pre-cool
- System 2: basic LD
- System 3: LD with 100 mm extra sample space, Mixing Chamber shield, additional sample mounting plate, and large amount of DC and RF cabling.
The Pulse Pre-Cooling sequence is one of the key points in reducing the cooldown time (see spots 2 and 3). Because we do not use exchange gas, some parts of the dilution refrigerator unit stay ‘hot’ on cool down, which prevents condensation of the helium3 –helium-4 mixture. To cool down these hot spots effectively, the mixture is repeatedly admitted from the tanks to the Still side of the dilution refrigerator to operate as an exchange gas and then pumped out again.
Gas Handling System & Control Software Generation 2
Gas Handling System Generation 2
Our new Gas Handling System delivers next-level control with unprecedented ease-of-use, class-leading safety and enhanced reliability.
Control Software Generation 2
Control Software Generation 2 completely redefines the experience of controlling cryogenic measurement systems.
Related Products
Measurement Infrastructure
Bluefors offers fully-integrated, scalable measurement infrastructure to provide the most reliable turnkey setups for quantum applications.
Magnets
Bluefors offers a range of integrated, cryogen-free superconducting magnets for our cryogenic measurement systems.
Preconfigured Systems
Our preconfigured Ultra-Compact LD Systems for superconducting qubit and spin qubit experiments come ready for results in 4 months.
Layout and Facility Requirements
6.0
LD
Dilution Refrigerator Measurement System
Layout Overview
Each of our systems is designed to be installed to a specific location defined in advance. A separate layout drawing is made for each Bluefors system, which should always be referred to for exact dimensions.
Facility Requirements
The basic requirements are 3-phase electricity, cooling water, and 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.
LD Systems Empowering Research
Quantum Magnonics: Toward Interconnected Quantum Systems
Building the Foundations of the Quantum Internet
Exploring Quantum Materials with Scanning SQUID Microscopy
Big Bang Vision: Exploring the Cosmic Microwave Background at Simons Observatory
Utilizing Synthetic Quantum Materials to Study Many-Body Systems
CCAT Observatory – Exploring the Universe from the Edge of the Sky
QTran Lab – Pushing the Boundaries of Quantum Device Technology
Detecting Dark Matter: The HAYSTAC experiment at Yale University
Aalto University: The First Bluefors Systems Still Cooling
See Also
Introducing Preconfigured LD Systems: Ready for Results in Just 4 Months
Increased Cooling Power Specifications for Bluefors Dilution Refrigerators
New Products: Enhanced Cooling, High-Density Flex Wiring, and LD450sl
First Generation 2 Systems Installed at the University of Copenhagen
Gas Handling System Gen. 2 – Designed for Performance
Control Software Generation 2 – Cool Power at Your Fingertips
Introducing the Ultra-Compact Dilution Refrigerator System
Cryomech PT310-RM Integrated Into Bluefors Dilution Refrigerators
Quantum Applications in the Bluefors Measurement System
1000th Bluefors system has been installed
How Does a Dilution Refrigerator Work?
Explore Our Services
Total System Care
Total System Care is tailored to your specific needs, with the features and services that are designed to best support your systems.
Customer Care
We support our customers throughout the lifetime of their system, providing dedicated care to find solutions for any issues.
Bluefors Lab
Bluefors Lab provides easy and convenient access to a cryogenic measurement system for startups, research groups, and other organizations.
Gas Handling System Upgrade
Bring all the advantages of our new Gas Handling System to older systems by upgrading to Gas Handling System Generation 2.
Pulse Tube Cryocooler Upgrade and Refurbishment
Our pulse tube cryocooler upgrade and refurbishment service helps you to maximize the performance of your systems and extend their lifetime.
Health Check
Health Check help you assess the health of your cryogenic measurement system, ensuring it operates at its best performance.
Training
We offer a training program to support users in operating and maintaining their systems throughout the lifetime of their Bluefors systems.
Relocation
Relocation service helps your when you need to move your lab and its cryogenic measurement systems to a new facility.
Spare Parts
Our spare part stock helps you to access genuine Bluefors parts quickly to maximize the uptime of your systems.
