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Cryogenics · 10 mK platform

Dilution Refrigerator

A cryogen-free dilution refrigerator with a 10 mK base stage, pre-cooled by a pulse tube cryocooler.

Pulse tube pre-cooled · Continuous cycle · Built at Medha

Dilution refrigerator stage stack with OVC cans removed
Stage stack, shields removed

From room temperature to 10 mK without liquid helium.

A pulse tube cryocooler takes the stack from room temperature down to its 4 K stage, delivering 2.0 W at 4.2 K with 55 W at 45 K. The dilution unit then carries the mixing chamber down to a 10 mK base temperature.

The system is supplied with its support infrastructure: dry vacuum pumping, helium leak detection, a closed-loop water chiller for the compressor, and Cernox thermometry on every stage.

  • Pulse tube pre-cooling
    2.8 K pulse tube base temperature
    60 min cool-down to 4 K
  • Stage interfaces
    ISO100 flanges and KF40 blanks
    ISO100 SMA disks for wiring feedthroughs
  • Thermometry and wiring
    Cernox temperature sensors
    DC wiring and copper-nickel coaxial cables
  • Vacuum and leak testing
    Kashiyama NeoDry dry vacuum pump
    Leybold PHOENIX helium leak detector

Specification

Pulse tube cryocooler
Cooling capacity
2.0 W @ 4.2 K w/ 55 W @ 45 K
Base temperature
2.8 K
Cool-down time
60 min to 4 K
Cold head weight
58 lb (26.3 kg)
Compressor package
Water cooled
Compressor weight
420 lb (190.5 kg)
Compressor dimensions
61 × 61 × 79 cm
Power, 50 Hz
380/415 VAC / 3PH / 11.4 kW
Power, 60 Hz
440/480 VAC / 3PH / 12.5 kW
Helium pressure
17.9 ± 0.34 bar @ 50 Hz
15.2 ± 0.34 bar @ 60 Hz
Flexible lines
20.1 m (66 ft)
Ambient range
7 °C to 38 °C
Cooling water
Requirement
13.6 LPM (3.6 GPM) @ 27 °C
Circuit
Chiller, pump, buffer tank, compressor
Glycol mix
50/50: +10% flow, +40% ΔP
Vacuum pumping
Pump
Kashiyama NeoDry series
Pumping speed
110–600 L/min by model
Ultimate pressure
0.7–5.0 Pa, no gas ballast
Supply
Single phase, AC 100–240 V
Leak detection
Leybold PHOENIX helium
Stages, thermometry and wiring
Stage ports
ISO100 flange, KF40 blanks
Signal feedthrough
ISO100 SMA disk
Sensors
Cernox
RF lines
Copper-nickel coaxial
Base temperature
10 mK, mixing chamber
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