XLDHe High Power System

Ultimate Cooling for 1 K Experiments

The extensive cooling power of the XLDHe High Power System makes it especially suitable for demanding applications such as single photon detectors for photonic quantum computers, or spin qubit quantum computing devices.

The standard configuration of the XLDHehp uses 2 x powerful PT425-ENH Pulse Tube Cryocoolers, and includes a large main heat exchanger and powerful booster pump for maximal helium-4 flow. This combination delivers excellent cooling power with 200-700 mW between 1-1.2 K on the experimental flange. The system reaches a typical base temperature of <900 mK in 12-16 hours, depending on the configuration.

The XLDHehp System utilizes our optimized pulse tube cryocooler integration, which results in a significant increase in the available cooling power at the 4K flange.

Triple Pulse Tube and Fast Turnaround Options

For the most demanding experiments, a version of the XLDHehp featuring 3 x PT425-ENH Pulse Tube Cryocoolers is available for improved 4K stage cooling power. Adding an optional LN2 Pre-Cooling Loop to this system brings the cooling time down to just 9 hours.

When combined with a 4K warm-up heater kit, it is possible to achieve extremely rapid turnaround times on all systems, increasing the number of experiments that can be carried out.

Fast Exchange of Wiring with Side-Loading Feature

The side-loading feature allows wiring assembly work to be performed away from the cryostat on a work bench. Consequently, the wiring for a second experiment can be prepared while the system is running. When the system is warmed 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 mechanical stability and maintains the correct flange spacing, simplifying the process of mounting into the cryostat.

Unique Wiring Capabilities

The XLDHe High Power System has a variety of access ports between the Room Temperature Flange and the Evaporator Flange. For example, the standard version with 2 pulse tubes includes:

• 6 x side-loading line of sight (LOS) ports
• 3 x KF40 LOS ports
• 4 x KF40 non-LOS ports

Side-loading ports (six ports in double pulse tube configuration and five ports in triple pulse tube configuration) can accommodate up to 32 standard SMA 18 GHz coaxial cable lines each. Larger volumes of RF cabling (up to 168 lines per port) are available in a high-density wiring solution.

Read more about High-Density Wiring

Vast Experimental Space

The XLDHehp is available in configurations with either 2- or 3-section vacuum cans:

• The standard model with 2-section vacuum cans, includes 1-section still shield to ensure a fast cooldown, and offers 175mm vertical experimental space.
• A model with 3-section vacuum cans expands the vertical experimental space to 776 mm, and adds a 2-section still shield, making it ideal for use with magnets.

Both versions offer a very large experimental flange diameter of 520 mm.

Magnet Integration

The XLDHehp with 3-section vacuum cans allows the installation of a 2-section still shield, making the system compatible with cryogen-free magnets. This makes it an ideal system for spin qubit applications, and expands the experimental area from 175 mm to 776 mm.

A wide variety of magnets is available, such as solenoid, vector, and split pair magnets.