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XLDHe High Power System

Measurement System

The XLDHehp provides extremely high cooling power and rapid cooldown times for experiments in the 1 K temperature range.

Highlights
Technical Specifications
Options
Layout and Facility Requirements
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The XLDHehp is a cryogen-free measurement system that utilizes helium-4 to deliver extremely high cooling power between 200-700 mW at 1–1.2 K. It is ideal for applications in the 1 K temperature range, such as single photon detectors for photonic quantum computers, or spin qubit quantum computing devices (when fitted with optional integrated magnets).

The system features side-loading ports for fast exchange of experimental wiring, and a large experimental flange of 540 mm. A configuration with integrated superconducting magnets and additional payload space is also available.

This vast cooling power and space provide enormous flexibility, and the fast turnaround system enables opportunities to scale up the number of experiments carried out.

Product Highlights

1.0

XLDHehp

Measurement 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 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.

Triple Pulse Tube and Fast Turnaround Options

For the most demanding experiments, a version of the XLDHehp featuring 3 x PT425 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

ThThe 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 540 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.

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

XLDHehp

Measurement System

Note: The cooling power is measured on the Evaporator flange . The sample space is measured on the bottom of the Evaporator flange . The cooldown time to base temperature is measured on an empty system with a standard sample space and shield set.

XLDHehpGuaranteed
Base temperature <900 mK
Cooling power at 1 K200 mW
Cooling power at 1.1 K400 mW
Cooling power at 1.2 K700 mW
Cooldown time to base temperature (empty system).

Optional LN2 pre-cooling loop available for faster cooldown time (<9 h with 2-section vacuum cans).
3 x PT425 and a short experimental space: <12 hours
2 x PT425 and a very long experimental space: <16 hours
Sample spaceØ540mm
Vertical experiment space175 mm (2-section)
776 mm (3-section)

Options

3.0

XLDHehp

Measurement System

Note: XLDHehp is available in configurations with either 2 or 3 x PT425 Pulse Tube Cryocoolers, and with either a 2-section vacuum can (with 175 mm vertical experimental space) or a 3-section vacuum can with 2-section, magnet-ready still shield (providing 776 mm vertical experimental space). The Additional 4K Flange option requires the third Pulse Tube Cryocooler integration. Still Heat Pipe is always included in XLDHehp systems.

Faster turnaround options

4K Warm-up Heater Kit

4K Warm-up Heater Kit

Fully automated fast warm-up option with a set of three resistive 4K heaters, which decreases the warm-up time of the XLDHehp.
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.
Additional Still Heat Pipe

Additional 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).

Shield options

Magnetic Shielding

Magnetic Shielding

Magnetic shielding provides protection for samples from interference caused by magnetic fields.

Other options

Additional Sensors

Additional Sensors

Additional temperature sensors can be integrated into the system for comprehensive diagnostics and measurements.
Additional 4K Flange

Additional 4K Flange

An additional 4K Flange can be used to dissipate large amounts of heat on XLDHehp system.
Optical Access Ports

Optical Access Ports

Optical Access Ports offer direct line-of-sight access to the sample 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

XLDHehp

Measurement System

Layout Overview

Each Bluefors system 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.

Note: Increasing the length of the helium pumping line will affect the guaranteed cooling power.

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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