LH

Dilution Refrigerator Measurement System

The LH System is a low-height, compact, and unique horizontal dilution refrigerator measurement system, capable of operating under different tilt angles.

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Bluefors LH System is a unique horizontal dilution refrigerator measurement system that is capable of operating under different tilt angles. It comes with special shields with removable blinds, which are easily modified into optical access ports.

These features make the LH System ideal for beam line, telescope, or detector applications.

Product Highlights

1.0

Dilution Refrigerator Measurement System

Fully Automated Operation

Fully automated cooldown sequence from room to base temperature, initiated with a single push of a button.

Extensive Capabilities for Experimental Wiring

All line-of-sight ports reach from room temperature to the Mixing Chamber.

2 x ISO-K63 slotted in all flanges
4 x KF40

Horizontal Orientation

Truly horizontal dilution refrigerator measurement system capable of operating under different tilt angles. Ideal for beam line, telescope, or detector applications.

Superior Performance

Base temperature below 10 mK
Fast cooldown: < 24 hours to 10 mK (measured on an empty system with standard sample space and shield set).

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 into all dilution refrigerator measurement systems.

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

Dilution Refrigerator Measurement System

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

LH250	Guaranteed	Expected
Base temperature	<10 mK	<8 mK
Cooling power at 20 mK	>10 μW	13 μW
Cooling power at 100 mK	>250 μW	300 μW
Cooling power at 120 mK	>360 μW	590 μW
MXC Flange Diameter	294 mm
Cooldown time to base temperature	< 24 hours	< 21 hours

Options

3.0

Dilution Refrigerator Measurement System

Performance Graphs

4.0

Dilution Refrigerator Measurement System

Bluefors-cool-down-profiles-for-LH-dilution-refrigerator-2018-12

1Start cooldown

2Start pulse pre-cooling

3Stop pulse pre-cooling

4Start mixture condensation

5Stop mixture condensation

6Normal circulation mode

Above is a cooldown curve for a configuration of LH horizontal dilution refrigerator measurement system measured with a calibrated resistance thermometer.

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 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.

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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Layout and Facility Requirements

5.0

Dilution Refrigerator Measurement System

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