
XLDsl-4K
Measurement System
The XLDsl-4K Measurement System provides a large experimental space and is designed for the most demanding 4 K experiments.
The XLDsl-4K system is built for the most demanding experiments at 4 K. Based on the Bluefors XLDsl Dilution Refrigerator Measurement System, with the same extensive wiring capabilities and large experimental space, the system can be cooled from room temperature to base temperature simply by starting the pulse tube compressors.
The side-loading design facilitates extensive experimental wiring opportunities, and superconducting magnets can also be easily integrated into the measurement system. The XLDsl-4K can also be upgraded to a Bluefors Dilution Refrigerator Measurement System at a later stage.
Product Highlights
1.0
XLDsl-4K
Measurement System
Side-loading Enables the Fast Exchange of Wiring
The side-loading feature allows wiring assembly work for the installation set flanges to be performed on a workbench away from the cryostat. Consequently, the preparation of a wiring assembly or a full experiment can be performed while the system is running. When the system is warmed up to room temperature, the assembly can be immediately exchanged, greatly reducing the room temperature idle time.
Preparing and exchanging the installation set assembly is carried out using a dedicated installation tool that provides the mechanical stability and maintains correct spacing between flanges when the assembly is not mounted into the cryostat.
Extensive Experimental Wiring Capabilities
The XLDsl-4K System offers a variety of access ports between the Room Temperature and the Mixing Chamber Flanges, the primary ports being the six side-loading line-of-sight (LOS) ports for experimental wiring.
- 6 x Side-loading ports (LOS)
- 4 x KF40 (LOS)
- 4x KF40
The side-loading system is compatible with our High-Density Wiring options. High-Density Wiring is a modular option for the XLDsl-4K dilution refrigerator measurement system that enables high scalability for the experimental wiring, especially for high-frequency signals.
Vast Experimental Space
Base Flange diameter: 556mm
High Cooling Power with Three Pulse Tube Cryocoolers
The standard configuration of the XLDsl-4K Measurement System includes two Pulse Tube Cryocoolers. It is possible to upgrade the system to have three Pulse Tubes for even higher cooling power. The third Pulse Tube will reduce the amount of available side-loading ports to 5.
Upgradeable to a Dilution Refrigerator Measurement System
The XLDsl-4K Measurement System gives you the possibility to upgrade to a dilution refrigerator measurement system at a later stage. The XLDsl-4K system is an XLDsl system without the dilution unit and the Gas Handling System. Upgrading only requires 3–4 days of on-site installation.
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 temperature status of the system.
Technical Specifications
2.0
XLDsl-4K
Measurement System
Note: Base flange diameter is measured with a standard experimental space and shield set. The cooldown time to base temperature is measured on an empty system with standard experimental space and shield set. Cooling power specifications are for the standard system with two Pulse Tube Cryocoolers.
| XLDsl-4K | PT415-ENH | PT425-ENH | PT310-ENH & PT425-ENH |
|---|---|---|---|
| Base temperature | < 3.2 K | < 3.2 K | < 3.0 K |
| Cooling power at 2nd stage at 4.2 K | 1.35 W | 2.35 W | |
| Cooling power at 2nd stage at 3 K | 0.9 W | ||
| Cooling power at 4K Flange at 3 K without experimental load | ~100 mW | ~600 mW | ~700 mW |
| Cooling power at 4K Flange at 4.5 K without experimental load | ~1800 mW | ~2000 mW | ~1800 mW |
| Cooling time | < 10 hrs | < 9 hrs | < 9 hrs |
| Base flange diameter | 556 mm | 556 mm | 556 mm |
Options
3.0
XLDsl-4K
Measurement System
Note: XLDsl-4K has configurations with two or three Pulse Tube Cryocoolers. The Additional 4K Flange option requires the third Pulse Tube Cryocooler integration.
Faster turnaround options
Frame Options
Shield options
Other options
Related Products
Cryogenic Measurement System Options
We offer various options for our Cryogenic Measurement Systems to optimize them for different uses and experimental needs.
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.
Layout and Facility Requirements
4.0
XLDsl-4K
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.
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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.

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