Dilution Refrigerators with Superconducting Magnets Andrey Penzev Project

Dilution Refrigerators with Superconducting Magnets Andrey Penzev, Project Engineer, Cryogenic Ltd

Integration of Cryogen Free DR(Leiden Cryogenics) with Superconducting Magnet Option 1: Cryogen Free Room Temperature Bore Magnet with Insertable DR • DR and superconducting magnet cooled by separate pulse tube coolers • Modular system. Easy to interchange DR with other inserts • Use with top-loading probe or bottom-loading DR • Fields up to 16 T • Suitable for use with our range of cryogen-free magnet systems Room Temperature magnet bore; 50 mm sample space in DR Suitable for use with Leiden DR type CF 200, CF 450, CF 650 or CF 1000

Integration of Cryogen Free DR(Leiden Cryogenics) with Superconducting Magnet Option 2: Modular Cryogen Free System in Shared Vacuum Space • Dilution Refrigerator (DR) and high field magnet in shared cryostat • Separate pulse-tube coolers for magnet and DR • Top loading Leiden DR for temperatures down to 10 m. K • Large 3 D cryogen free vector magnet (9 T / 5 T / 1 T) • 4 Tesla rotating magnetic field vector • Use with top-loading probe for easy sample change 50 mm 4 K magnet bore, 30 mm sample space in DR

Integration of Cryogen Free DR(Leiden Cryogenics) with Superconducting Magnet Option 3: Cryogen-Free DR with Integrated Magnet • Magnet thermally linked to the cryocooler 2 nd stage • Ideal for smaller magnets up to 17 T or small vector magnets up to 7 T/2 T/2 T • Single pulse tube cryocooler for cooling both magnet and DR • Magnet operation at 4 K • Use with top-loading probe • Fast Sample Change 64 mm magnet bore, 50 mm sample space in DR

Integration of Cryogen Free DR(Leiden Cryogenics) with Superconducting Magnet Option 4: Cryogen Free Magnet & Integrated Variable Temperature Sample Space With DR Insert • Adapted MCK model DR inserted into 50 mm 1. 6 K– 300 K VTI • VTI cooling power used for condensing stage of DR • Versatile solution as the magnet system can also be used with other inserts and measurement probes including He 3, heated probes, rotator, VSM etc. • Bottom loading DR with options of sample in liquid or sample in vacuum • Suitable for use with systems up to 18 T and neutron-scattering split-pair systems 50 mm 4 K magnet bore, 30 mm sample space in DR

Compensated Magnets for CF Dilution Refrigerators Field up to 16 T Magnetic field compensation on the mixing chamber plate: • Standard: down to 300 Gauss; • Improved: down to 100 Gauss.

Top-Loading Sample Probe with Wire Connection at Mixing Chamber • 72 dc wires, 8 coaxial cables • Sample at T<10 m. K without field; at T<17 m. K at 14 T => Fast sample exchange

Dilution Refrigerator Insert with Sample Loading Tube UHV compatible sample loading tube (for STM applications – UNISOKU Co. , Ltd, Japan) • Liquid helium cryostat with solenoid up to 16 T or vector magnet 9 T-2 T-2 T with 75 mm bore; • DR base temperature < 30 m. K; • Sample access tube Ø 16 mm/Ø 19 mm; • Sample space Ø 66 mm x 165 mm long.

Dilution Refrigerator Insert with Sample Loading Tube

Automated Gas Handling System The gas handling system is specifically designed for safe and reliable handling of 3 He-4 He mixture gas during operation of a dilution refrigerator. The system electronics is based on OMRON industrial automation components to provide fault-free operation. Touchscreen interface provides a manual mode as well as a set of automated sequences for helium mixture condensation, circulation and recovery.

Work in progress: DR Option for Cryogen Free Measurement System Cooling insert compatible with 25 mm/30 mm VTI: • Field up to 18 T; • Base temperature goal: 50 m. K; achieved: 75 m. K for 25 mm, 65 m. K for 30 mm.

Work in progress: DR Option for Cryogen Free Measurement System Sample change and ultralow temperature measurements within 1 working day! Compatible with our universal 6 -pin plug

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