New product
- Cryogen free cryostat with superconducting solenoid for 8 T
Cryogen free cryostat with superconducting solenoid for 8 T at 4.2 K with variable-temperature insert 5-300 K. The cryostat is built using one cryocooler and is very compact. The current leads are made of 2-nd generation HTSC ribbon. Cryostat is designed for electrophysical investigations at low temperatures and high magnetic field.
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Cooling principle
The cooling is performed by means of cryocooler
Cryocooler type: Pulse tube;
Cooling gas: He4;
Pulse tube heat load:
1-st stage: 40 W at 45 K;
2-nd stage: 1 W at 4.2 K;
Minimum temperature: 2.7 K;
Compressor"s power consumption: 10 kW.
Cooler design
To prevent the radiation heat flow from external body of the cryostat to solenoid, the heater is protected by copper shield cooled by the 1-st stage of the pulse tube.
Superconducting solenoid and heat key are cooled by 2-nd stage of the pulse tube by means of copper heat bridges.
To secure high vacuum inside the cryostat body is used the high productivity internal coal pump.
The sample room of the variable-temperature insert is filled by helium gas. The temperature stabilization is performed by temperature controller via PID-regulator using the resistive heater and temperature sensor, located near the sample.
Heat key
Heat key consists of two coaxial copper tubes, connected from one side to the 2-nd stage of the pulse tube, and from other side – to the variable-temperature insert. When the space between tubes is evacuated, the thermal conductivity of the heat key is small, when filled – it is high (for cooling down to 5 K the sample room).
Superconducting solenoid
Superconducting solenoid is made of NbTi; wire reeled on the copper framework.
Basic parameters:
Magnet bore: 44 mm;
Magnet outer diameter: 114 mm;
Magnet height: 153 mm;
Maximum current: 87.82 A;
Maximum field: 8.22 T.
Basic parameters of the system
Cryostat height, mm
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670
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Cryostat diameter, mm
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400
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Minimum sample temperature, K
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5
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Maximum sample temperature, K
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300
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Temperature of the 1-st stage, K
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30
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Operating vacuum, mbar
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10-6
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Variable-temperature insert diameter, mm
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19
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Maximum field, T
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8
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Maximum current, A
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90
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Field homogeneity, %
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1
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Solenoid protection
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yes
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Operation-ready time, hours
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< 8
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Compressor cooling
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water
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Helium house length, m
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20
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Low-frequency electric connectop, pin
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4
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High-frequency electric connectop, pin
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10
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