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The Proteox dilution refrigerator: a step-change in Cryofree® system modularity

Maximise system value: Self-supporting Secondary Insert enhances adaptability, enabling rapid exchange of full experimental setups for a multi-user, multi-experiment system.

Future-proof investment: Upgradeable Secondary Inserts are cross-compatible and transferrable between ProteoxTM family systems.

Unlock new applications: Large experimental volume and abundant line of sight access provides high I/O capability for Qubit scale-up and Quantum Computing applications.

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Primary Insert

The key features of the Proteox dilution refrigerator are:

Multi-user and multi-experiment

DC wiring, coaxial wiring, cold electronic components and samples can be fully integrated on to multiple Secondary Inserts for easy removal, modification and exchange.

 

High Input/Output capability

Enables high input/output applications through abundant line-of-sight (LOS) access. Up to 2 × ISO100 ports on the Secondary Insert, 2 × KF40 and 2 × KF25 on the primary insert.

 

Extensive experimental volume

Large 360 mm diameter mixing chamber plate, combined with increased spacing to provide a large experimental volume.

Greater control

A patented gas gap heat switch system provides active control of thermal conductivity between experimental plates.

Reliability and convenience

New gas handling system delivers increased reliability and longer service intervals with automated pump bypass.

 

Magnet options

In-house design, manufacturing and support of both the dilution refrigerator and the superconducting magnet. This provides a fully integrated system with unified software control and data logging.

 

Integrate sample exchange

Include the Oxford Instruments patented bottom loader system directly onto the Secondary Insert for rapid sample exchange coupled with magnet integration.

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Simple, powerful software

Web-based, platform-independent, control software for straightforward system control and powerful system logfile visualisation.

 

500 μW dilution unit:

  • Base temperature: < 10 mK
  • Cooling power at 20 mK: 12 μW
  • Cooling power at 100 mK: > 450 μW
  • Temperature control range: 10 mK to 30 K with magnet at full field
  • Sample space: 360 mm diameter mixing chamber plate
  • 18 L of He-3 gas

300 μW dilution unit:

  • Base temperature: < 10 mK
  • Cooling power at 100 mK: 250 µW
  • Temperature control range: 10 mK to 30 K with magnet at full field
  • Sample space: 360 mm diameter mixing chamber plate
  • 11 L of He-3 gas

Simple, powerful software

  • Web-based, platform-independent, control software
  • Published API interface allows full programmatic control
  • Event log tracking
  • Powerful system logfile visualisation
  • Smart session management for multi-user access
  • Secure database for logging of system data

Oi Service – We’ll give you peace of mind with your Proteox

Our OiService Proteox support plans provide options to best suit your support and service requirements. The plans will maximise system uptime, reduce service and maintenance costs, prevent unplanned interruption and extend the life of your instrument.

Our highly skilled service engineers deliver rapid support and world-wide coverage from our global service hubs are backed by technical experts to ensure your critical needs are given the highest priority.

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Secondary Insert

The Proteox dilution refrigerator Secondary Insert is a customisable, self-supporting module for installation and exchange of full experimental setups.

Overview

Moving beyond standard access ports, the Secondary Insert can accommodate full experimental set-ups, including DC wiring, coaxial wiring and signal conditioning components.

  • Flexible, modular format enhances adaptability to varied application requirements
  • Large 117 mm × 253 mm rectangular LOS access port. This can be configured as a single customisable plate, or with 2 × ISO100 ports and a range of standard options 
  • The Secondary Insert can be ordered with our patented bottom loading system as an option. This enables rapid sample exchange and can be coupled with magnet integration

ISO 100 Port Configurations

A standard configuration of 2 x ISO 100 ports, with multiple ISO 100 options to provide experimental wiring.

  • Up to 37 UT85 coax per ISO 100 port
  • Include DC and coax combinations on a single ISO 100 port
  • Blanking plate option with tapped M3 grid array for mounting of experimental hardware

Custom Configuration

  • Components can be directly mounted onto the Secondary Insert plate, creating a platform tailored to your experiment
  • Custom configurations enable up to 128 UT85 coax lines per Secondary Insert

Wide selection of factory installed wiring. This has been cryogenically cycled, factory tested and benefits from the full 3-year system warranty.

Flexible Wiring

  • 24-way twisted-pair DC looms with Cu, Constantan or NbTi conductors
  • Flexible coaxial (S1) wiring for use up to 500 MHz
  • Single-mode and multi-mode optical fibres
  • Thermo-coaxes for effective filtering of high-frequency noise
  • Low-impedance looms suitable for nano-positioning piezo devices

Line-of-sight wiring

  • UT34 and UT85 coax with SMA or SK connectors for 18 GHz or 40 GHz bandwidth operation
  • Range of coax conductors including stainless-steel, CuNi and NbTi
  • Heat sinking using bulkhead connectors at all experimental plates with optional 0 dB attenuators for efficient conductor thermalisation.

 

 

Integrate our patented sample loader directly onto the Secondary Insert whilst retaining a full ISO 100 line of sight port for additional experimental services.

  • Easy sample exchange without the need to warm the entire system to room temperature
  • Loading a sample puck takes < 15 minutes and the system automatically cools back to base temperature
  • Up to 28 RF and 96 DC connections on a single sample puck
  • Ideal solution for multi-user facilities since different experiments can be prepared in multiple sample pucks
  • Patented loading concept allows for safe and easy operation
  • ESD protection (make-before-break) via sample grounding or biasing before the puck docks with the system

Attenuators

Attenuators can be selected per line and per plate; 0 dB attenuators for conductor thermalisation; 3 dB, 6 dB, 10 dB and 20 dB attenuators for signal conditioning.

Low Pass Filters

Low-pass multi-stage filters can be mounted onto the Secondary Insert for use at cryogenic temperatures to below 100 mK.

  • 4 cut-off frequencies available between 170 Hz and 110 kHz.
  • Au plated Cu chassis with RF gaskets to provide screening and thermal dumping for the filter PCB
Cut-off FrequencyPass BandInsertion Loss Over PassbandFrequency Rejection
170 Hz85 Hz<0.6 dB-45 dB @ 100 kHz
1.85 kHz900 Hz<0.6 dB-33 dB @ 100 kHz
12 kHz5 kHz<1.0 dB-36 dB @ 1 MHz
110 kHz40 kHz<1.0 dB-24 dB @ 1 MHz

 

 

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Magnet Technology

In-house design, manufacturing and support of both the dilution refrigerator and the superconducting magnet deliver a fully integrated system with unified software control and data logging.

Solenoid magnets

  • Range of standard magnetic flux densities up to 14 T
  • Central field homogeneity of 0.1 % over 10 mm D.S.V across the range
  • High filament count conductor for lower losses during ramping, reduced remanence and low flux jumping
  • High current, low inductance designs reducing conductor thermal mass and improving cool down times
  • Persistent mode operation ≤0.01 %/hr-1 as standard
  • Large bore sizes from 77 mm to 152 mm diameter across the standard solenoid magnet range
  • Typical ramping times of less than ≤1 hr from 0 to rated field.
  • Quench protected.
  • Bolted current lead connections for easy removal or upgrade
  • Integrated sensor for temperature monitoring
Magnet OptionsBottom Loader Puck Options
Magnetic Field / TBore / mmPuck Dia. / mmPuck Connectivity
147760up to 22 coax, 96 DC
129072up to 28 coax, 96 DC
127760up to 22 coax, 96 DC
109072up to 28 coax, 96 DC
87760up to 22 coax, 96 DC
515272up to 28 coax, 96 DC
110072up to 28 coax, 96 DC

Vector rotate magnets

  • Three-axis vector magnets with a vertical field up to 9 T and a horizontal field up to 3 T
  • Driven magnets as standard with no persistent switch
  • Typical ramp rates of 0.25 T/min.
  • 90 mm large bore across all high field vector rotate options
  • Typical tilt at 2.5 degrees for the maximum field axis e.g. 6-2-1 gives 6 T vector modulus, up to 2.5 degrees conical rotation about the Z axis
  • Full 360 degrees rotation at the second rated axis field e.g. 6-2-1 gives 2 T vector modulus, full rotation about the Y axis
  • Full spherical rotation at the lowest rated axis e.g. 6-2-1 gives 1 T vector modulus, full rotation in a sphere about any axis or combination
Magnet OptionsBottom Loader Puck Options
Magnetic Field / TBore / mmPuck Dia. / mmPuck Connectivity
9,1,19072up to 28 coax, 96 DC
6,2,29072up to 28 coax, 96 DC
6,3,1.59072up to 28 coax, 96 DC
6,2,19072up to 28 coax, 96 DC
6,1,19072up to 28 coax, 96 DC

Customised magnets

Beyond the standard offering, our in-house team can design bespoke magnets to meet your experimental needs. Full FEA and electromagnet modelling capabilities ensure the integration of the magnet to the system is robust in terms of both magnet and system performance.

Optimised for:

    • Higher persistence
    • Split pair configurations for optical access
    • Custom vector combinations including optical vector magnets and persistent vector magnets
    • Higher homogeneity over standard volumes or custom sample volumes with defined homogeneities
    • Higher resolution
    • Stray field reduction using active shield technology
    • Gradient coils
    • Field cancellation to <100 gauss at the mixing chamber plate for sensitive equipment
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