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LDHe

Measurement System

The LDHe Measurement System is a versatile helium system that allows you to conduct experiments down to 1 K or 0.5 K.

Highlights
Technical Specifications
Options
Layout and Facility Requirements
Contact Sales

The LDHe Measurement System allows you to conduct experiments down to 1 K or 0.5 K. The different base temperatures depend on the helium isotopes used, with 1 K achieved using helium-4, and 0.5 K achieved with helium-3.

There are two different models of the system available: LD250He and LD400He. The key difference between these systems is the Gas Handling System used. The LDHe system can be upgraded to a Dilution Refrigerator Measurement System at any later stage.

Product Highlights

1.0

LDHe

1K System

Extensive Capabilities for Experimental Wiring 

The system offers a variety of access ports between the Room Temperature Flange and Evaporator Flange for experimental wiring. 

  • 2 x ISO-K63 slotted in all flanges 
  • 5 x KF40 including central port 

High, Continuous Cooling Power 

The main advantage of the LDHe System is its Gas Handling System, which is of a robust size to provide the high and continuous cooling power of the system. In addition, the system can be operated with either helium-3 or helium-4. The typical base temperature, below 500 mK, is easily achievable with 7 liters of the helium-3 as an operational gas. Temperatures below 900 mK are achievable with helium-4. 

Large Experimental Space

The Evaporator Flange diameter is 303 mm. 

Upgrade to a Dilution Refrigerator Measurement System

The LDHe Measurement System is an LD System without the dilution unit. It is possible to upgrade it to a Dilution Refrigerator Measurement System at any later stage. The upgrade can be completed with an on-site installation in 3–4 days. 

The LD250He model can be further upgraded to a full LD250 Dilution Refrigerator Measurement System, and the LD400He model to an LD400 System.

Temperature Controller

The Bluefors Temperature Controller enhances the user experience of our cryogenic systems. With a modern and intuitive user interface, you get direct control and overview of the temperature status of the system. The Bluefors Temperature Controller is fully integrated to the system. 

Read more about Bluefors Temperature Controller. 

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.

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Technical Specifications

2.0

LDHe

1K System

Note: The cooling power is measured on the Evaporator Flange. The cooldown time to base temperature is measured on an empty system with a standard experimental space and shield set. Note that with the different Gas Handling Systems, different operating temperatures can be reached with the helium-3 systems. The LD400He model can be operated up to ~0.9 K, whereas the LD250He model has an upper limit of 0.7 K.

LD250HeLDHe (He-3) LDHe (He-4) 
GUARANTEED EXPECTED GUARANTEED EXPECTED 
Base temperature 450 mK 430 mK 850 mK 830 mK 
Cooling power at 1 K 30 mW 33 mW
Cooling power at 0.7 K 15 mW 16 mW 
Cooldown time  12 h 12 h 
Evaporator Flange diameter303 mm 303 mm 

LD400HeLDHe (He-3) LDHe (He-4) 
GUARANTEED EXPECTED GUARANTEED EXPECTED 
Base temperature 450 mK 430 mK 850 mK 830 mK 
Cooling power at 1 K 30 mW 35 mW
Cooling power at 0.7 K 15 mW 16 mW 
Cooldown time  12 h 12 h 
Evaporator Flange diameter303 mm 303 mm 



Options

3.0

LDHe

1K System

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.
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.
Helium Battery

Helium Battery

The Helium Battery makes it possible to run experiments at mK temperatures for a limited time with the pulse tube cryocooler turned off.
Long-Life Cold Trap

Long-Life Cold Trap

The Long-Life Cold Trap enables the 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.

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.

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Related Products

Layout and Facility Requirements

4.0

LDHe

1K System

Layout Overview

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

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.

See also

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