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XLDsl

Dilution Refrigerator Measurement System

The XLDsl Dilution Refrigerator Measurement System is designed for demanding experiments that require large experimental space, extensive wiring, and superior performance.

Highlights
Technical Specifications
Pulse Tubes
Options
Performance Graphs
Layout and Facility Requirements
Contact Sales

The XLDsl accommodates up to 1008 factory-installed semi-rigid 18 GHz coaxial lines in a configuration with two pulse tubes. Its side-loading feature allows experimental wiring to be prepared away from the cryostat while the system is running.

Even with its extensive capabilities and superior performance, a fully automated cool-down sequence from room to base temperature can still be carried out at the push of a single button.

Product Highlights

1.0

XLDsl

Dilution Refrigerator 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.

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.

Learn more about enhanced cooling

Extensive Experimental Wiring Capabilities

The XLDsl System features 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)
  • 3 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 dilution refrigerator measurement system that enables high scalability for the experimental wiring, especially for high-frequency signals.

Read more about High-Density Wiring

Vast Experimental Space

Mixing Chamber Flange Diameter: 500 mm | 20″

A centrally-placed unit distributes the cooling evenly around the Mixing Chamber Flange. The open design permits easy experiment access without the heat exchangers or system support structure obscuring access.

Superior Performance

  • Base temperature below 10 mK
  • Cooling power: >30 µW at 20 mK
  • Cooling power: >1000 µW at 100 mK

See all technical specifications

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.

Read more about the Temperature Controller

Low Total Cost of Ownership

Oil-free pumps and compressors in the Gas Handling System guarantee minimal maintenance requirements with a service interval up to 3 years. The systems contain only high-quality components such as Pfeiffer Vacuum pumps and pressure sensors, VAT vacuum valves and bellows.

Gas Handling System & Control Software Generation 2

Services

Total System Care

Total System Care enables you to focus on your own work – doing research and measurements. The service ensures that systems operate at the best possible performance level and with maximal uptime, without users needing to spend time maintaining the systems themselves.

Learn more

Technical Specifications

2.0

XLDsl

Dilution Refrigerator Measurement System

Note: Cooling power is measured from experimental flange outside the Mixing Chamber. Cooldown time to base temperature is measured from an empty system with standard experimental space and shield set.

XLD1000slGuaranteedExpected
Base temperature 10 mK8 mK
Cooling power at 20 mK>30 μW34 μW
Cooling power at 100 mK>1000 μW1100 μW
Cooling power at 120 mK>1400 μW1600 μW
MXC Flange Diameter500 mm

XLD400sl GuaranteedExpected
Base temperature 10 mK8 mK
Cooling power at 20 mK>14 μW16 μW
Cooling power at 100 mK>400 μW450 μW
Cooling power at 120 mK>575 μW650 μW
MXC Flange Diameter500 mm

Pulse Tube Cryocooler Configurations

3.0

XLDsl

Dilution Refrigerator Measurement System

Cryomech Pulse Tube Cryocoolers with remote motors provide cryogenic cooling power to the dilution refrigerator measurement system without the need for liquid cryogens. The cooldown time of the system partly depends on the selected pulse tube power and the upgraded pulse tube models provide increased cooling power at the 4K Flange. See available cryocooler models in the table below.

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. When systems with enhanced cooling are operated at 3 K, the available cooling power at the 4K flange doubles. With the enhanced PT425-RM & PT310-RM combination, the XLD1000 now has 650 mW of available cooling power at the 4K flange at 3 K.

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. With the enhanced PT425-RM, the XLD1000sl System can now provide 2000 mW of available cooling power at the 4K flange while operated at 4 K – tripling the amount of cooling power. Learn more about enhanced cooling here.

The PT310-RM configuration also provides 10% increase in MXC Flange cooling power. Learn more here.

Pulse Tube Cryocooler ConfigurationXLD400slXLD1000sl
PT425-ENH & PT310-ENH–Available
PT425-ENH x 2–Default
PT425-RM & PT310-RMAvailable–
PT425-RM x 2Available–
PT420-RM x 2Available–
PT415-RM x 2Default–

Options

4.0

XLDsl

Dilution Refrigerator Measurement System

Note: XLDsl has configurations with two or three Pulse Tube Cryocoolers. The Additional 4K Flange option requires the third Pulse Tube Cryocooler integration. Still Heat Pipe is always included in XLDsl systems.

Faster turnaround options

4K Heater

4K Heater

The 4K Heater is a fully automated fast warm-up option, which decreases the warm-up time for our cryogenic measurement systems.
Fast Sample Exchange System

Fast Sample Exchange System

The Fast Sample Exchange (FSE) System is a fully automatic load-lock system for fast sample loading and unloading.
LN2 Pre-Cooling Loop

LN2 Pre-Cooling Loop

The Liquid Nitrogen (LN2) Pre-Cooling Loop can be pre-installed in our systems at the factory to achieve faster cooldown.
Still Heat Pipe

Still Heat Pipe

The Still Heat Pipe is a passive component that reduces cooldown time by 10-15%, and improves turnaround time.

Frame Options

Additional Vibration Isolation

Additional Vibration Isolation

We offer improved vibration isolation for experiments that are particularly sensitive to low frequency vibrations (< 1 kHz).
Sound Isolation

Sound Isolation

Improved sound isolation for systems situated in spaces that require quieter work environments.

Shield options

Additional Radiation Shields

Additional Radiation Shields

We offer the possibility for additional electromagnetic shielding around the experimental space.
Magnetic Shielding

Magnetic Shielding

Magnetic shielding provides protection for samples from interference caused by magnetic fields.

Gas Handling System options

Industrial PC

Industrial PC

The high-performance industrial PC offers fully independent and versatile operation of the Bluefors dilution refrigerator measurement system.
Instrument Cart

Instrument Cart

The Instrument Cart can house supplementary equipment such as temperature controllers, power supplies, and rack-mounted electronics.
Redundant Main Circulation Unit

Redundant Main Circulation Unit

For added security, we offer a Redundant Main Circulation Unit to secure operation in atypical circumstances
Service Booster

Service Booster

The Service Booster is a dedicated turbomolecular pump for vacuum pumping, enabling more secure operation of the system.

Other options

Additional Sensors

Additional Sensors

Additional temperature sensors can be integrated into the system for comprehensive diagnostics and measurements.
Additional 4K Flange

Additional 4K Flange

An additional 4K Flange can be used to dissipate large amounts of heat on XLDsl Systems.
Long-Life Cold Trap

Long-Life Cold Trap

The Long-Life Cold Trap enables operation without an external LN2 trap, and continuous operation of the system for up to three years.
Optical Access Ports

Optical Access Ports

Optical Access Ports offer direct line-of-sight access to the experimental space.

Performance Graphs

5.0

XLDsl

Dilution Refrigerator Measurement System

1Start cooldown
2Start pulse pre-cooling
3Stop pulse pre-cooling
4Start mixture condensation
5Stop mixture condensation
6Normal circulation mode

Figure above shows the cooldown curves for a configuration of an XLD1000sl System with dual PT420-RM pulse tubes, 625 mm sample space height, without Mixing Chamber Shield, 168 High-Density Wiring, and 25 coax lines to 4K Flange.

1Start cooldown
2Start pulse pre-cooling
3Stop pulse pre-cooling
4Start mixture condensation
5Stop mixture condensation
6Normal circulation mode.

Figure above shows the cooldown curves for a configuration of an XLD1000sl System with dual PT420-RM pulse tubes, 625 mm sample space height, with Mixing Chamber Shield, and minor wiring.

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 cooldown, which prevents condensation of the 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.

1Start cooldown
2Start pulse pre-cooling
3Stop pulse pre-cooling
4Start mixture condensation
5Stop mixture condensation
6Normal circulation mode

Above are cooldown curves for two different configurations of XLD400sl systems measured with calibrated resistance thermometers.

  • System 1: basic XLD400sl with 75 coaxial lines and 144 DC lines.
  • System 2: XLD400sl with extra space, Mixing Chamber Shield, and additional sample mounting plate.

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 cooldown, which prevents condensation of the 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.

Services

Customer Care

We support our customers throughout the lifetime of their system, providing dedicated care to find solutions for any issues. Our technicians and engineers are ready to help you wherever you are located, with prompt service delivered either remotely or on-site.

Learn more

Related Products

Layout and Facility Requirements

6.0

XLDsl

Dilution Refrigerator Measurement System

Layout Overview

Bluefors XLD System layout overview.
1. Cryostat and its support frame, 2. Thermometry Unit, 3. Gas Handling System, 4. Pulse Tube Cryocooler compressors.

Each Bluefors system 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.

See Also

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