1.5K three-stage GM ultra-low temperature cryocooler cold head is a high-performance closed-cycle cryogenic cooling core device evolved from the traditional two-stage GM refrigerator architecture. Through an innovative three-stage cascaded refrigeration design, it breaks through the lower temperature limit of conventional 4K-class two-stage cold heads. While retaining the advantages of traditional GM refrigerators—high stability, low maintenance, and helium-free closed-cycle operation—it significantly extends deep cryogenic performance, enabling a minimum achievable temperature of 1.5K.

It is ideally suited for ultra-low temperature applications at and below 2K, providing stable refrigeration performance and effectively filling the performance gap of conventional commercial GM cold heads in the sub-2K temperature range.

This series of three-stage GM ultra-low temperature cryocooler cold heads is a high-performance closed-cycle cryogenic cooling core system evolved from the traditional two-stage GM refrigerator architecture. Through an innovative three-stage cascaded refrigeration design, it overcomes the lower temperature limit of conventional 4K-class two-stage cold heads. While retaining the inherent advantages of GM cryocoolers—high stability, low maintenance, and helium-free closed-cycle operation—it significantly expands deep cryogenic performance capability.

The system can achieve a minimum base temperature of 1.5 K, making it ideally suited for stable refrigeration in ultra-low temperature applications at and below 2 K. It effectively fills the performance gap of conventional commercial GM cold heads in the sub-2 K temperature regime.

Core Product Advantages

· Breakthrough in deep cryogenic performance:

Three-stage cascaded refrigeration architecture breaks through the limitations of conventional 4 K cold heads, enabling stable operation down to 2 K and achieving a minimum temperature of 1.5 K. The system delivers industry-leading deep cryogenic performance.

· Dual-model configuration for precise application matching:

Two power-level variants are available to match both light-load and heavy-load sub-2 K cooling requirements, providing comprehensive application coverage and efficient model selection.

· High-efficiency operation with no refrigerant or gas consumption:

Helium-free closed-cycle self-refrigeration eliminates the need for cryogenic consumables. The system features stable operation, low vibration, high temperature control precision, and supports continuous 7×24 hour operation.

· Modular integrated design:

Compact and well-structured design enables easy integration with vacuum chambers, precision experimental platforms, and measurement systems, making it suitable for both scientific research and industrial applications.

System Composition

1. Three-stage cold head

GM refrigerator unit

Interface flange: gas inlet, gas outlet, and 24-pin LEMO vacuum electrical connector (for sensor and heater wiring)

Helium gas circuit and heat exchangers

Three-stage cold plate: 100 mm diameter, with uniformly distributed M3 threaded holes at 12.5 mm spacing

2. Gas control system

Gas storage cylinder

Gas control cabinet

Gas control pipelines and valves

Gas circulation dry pump

Product Model