Helium recirculating cryogenic system(Qcryo^®)

Helium recirculating cryogenic system (registered trademark: Qcryo®) is a multifunctional and high-efficient cryogenic system that efficiently converts ordinary commercial 4K refrigerators into high-quality cold sources with lower vibration levels and lower temperatures. It can cool down continuous flow low-temperature cryostat to <2.5K (optional:<1.8K, 1.5K, 1.3K) without consuming liquid helium. Qcryo works together with sub-K cryostat to achieve a low vibration low-temperature system with a base temperature of less than 850mK, and with a He-3 low-temperature cryostat to achieve a low vibration He-3 system with a base temperature of less than 350mK (Continuous type) or 280mK (One-shot type).

Qcryo solves the common problem of large vibration in commercial low-temperature refrigerators, and can upgrade various commercial low-temperature cryostats to dry closed-loop low-temperature systems that do not consume liquid helium. It is particularly suitable for vibration sensitive experiments such as STM, SEM, AFM, SNOM, microscopic optics, magneto-optical, and single photon detection, ESR/EPR, Ion traps, cold atoms/molecules, optical clocks, (Nano)ARPES, and high-energy physics, etc.

Ultra low vibration

Adopting patented cold head suspension damping technology, combined with multiple damping techniques and flexible transfer lines, the problem of large vibration in conventional refrigerators has been solved, which is particularly suitable for low-temperature experiments that are sensitive to vibration.

Super cooling capacity

The use of multiple pre-cooling techniques combined with a unique self-constant pressure gas treatment system is an ideal cold source for achieving low vibration and low temperature systems such as 2.5K, 1.8K, 1.3K, sub-K, 350mK, and 280mK, with faster cooling speed and better temperature stability.

Good compatibility

Not only can it be used as a cold source for various commercial low-temperature cryostats/ probe stations, but it can also be used as a cold source for magneto-optical cryogenic systems, low vibration sub-K cryostats, and low vibration He-3 cryostats.

Low usage cost

No consumption of liquid helium, greatly reducing operating costs.

High integration and space saving

Providing highly integrated cabinets without the need for large volume helium recovery airbags, greatly saving floor space.

Examples:

1. Low vibration cryogen free cryogenic system (Qcryo-S-100) is compatible with the Bruker 80V Fourier transform spectrometer, enabling cryogenic infrared photoluminescence, transmission, photocurrent spectroscopy, and dark current testing of infrared detectors and FPA.

   
   

2. Low vibration ultra-high vacuum compatible cryogenic system (Qcryo-S-200) for ion traps, cold atoms/molecules, etc.

Cold plate Dia: 25cm, base temperature:<2.5K, typical cooling power at cold plate: 650mW@4.2K (Option: 1W@4.2K)

3. Compact cryogen free microscopy system (Qcryo-S-300) is matched with a magneto-optical Kerr microscope and an ultra compact tail matched electromagnet, used for magneto-optical Kerr microscopy imaging testing and magnetic domain reversal testing, with a base temperature of<2.5K.

4. Compact cryogen free microscopy system (Qcryo-S-300) integrates a BeCu DAC and a dual membrane pressure regulating mechanism, 

allowing for remote high-precision in-situ pressure regulation at low temperature for high-pressure X-ray experiments.

5. Customized cryogen free cryogenic system (Qcryo-S-300-C), matched with friction testing device for tribology application, with a base temperature of < 2.5K when unloaded, a base temperature of<5.2K after installing the friction device, and a base temperature of <5.8K after the friction head contacts the sample stably.

6. The ultra-high vacuum compatible cryogen free cryogenic insert (Qcryo-S-400) is applied in the STM field, 

with sample temperatures below 3K and better resolution than 2pm.

7. Helium recirculating cryogenic system (Qcryo) applied to NanoARPES experiments, 

the vibration level at the sample holder was measured to be within 1nm using a specialized online vibration testing device. 

8. Cryogen free microscopy system (Qcryo-S-500) is integrated with a micro-photoelectric system to achieve reflection/transmission spectra, photoconductivity, Raman spectroscopy, fluorescence/fluorescence lifetime testing, single point and two-dimensional scanning imaging testing in the temperature range of 2.5K-350K. 

9. Helium recirculating cryogenic system (Qcryo) is combined with liquid helium bolometer to form a dry bolometer that does not consume liquid helium.

 Its sensitivity and signal-to-noise ratio are consistent with those of liquid helium bolometer. 

10. Cryogenic magneto-optical system (Cryo-MO) adopts a cold source from Qcryo, integrating top and side windows. The base temperature is 1.5K, 

the magnetic field strength range is ± 7T and the nominal vibration level is 5nm

11. The cold source of split type continuous He-3 refrigerator comes from the helium recirculating cryogenic system(Qcryo), which isolates the vibration from the cold head and compressor, solving the common problem of large vibration in dry He-3 refrigerator. The base temperature for continuous operation is less than 350mK, which is applied to STM to achieve 1pm resolution.