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LTL - Dry dilution refrigerators

NANO-X

Main characteristics      

Base temperature: <25 mK (<20 mK expected)

Cooling power mixing chamber at 100 mK: 125 uW

Cooling power 4K-flange at 4K: >0.25 W

Cooldown time to basetemperature: <24 hours (<20 hours expected)

Measurement Circuitry 

The cryostat is design for high frequency measurements at base temperatures as low as 50mK. There are altogether 6 coaxial high frequency lines and around 30 dc measurement lines.

4K Magnet 

As of September 2015 there is a superconducting magnet installed on the 4K shield. The magnet and wiring is organised as follows:

RT to 60K - Brass strip approx. 10mmx0.5mm

60K to 4K - High temperature superconducting strip clamped to silver coated copper. The both flanges there is copper strip (approx. 10mmx0.5mm) bolted to the HTS clamps and pressed against clamps on the flanges. The clamps on the flanges are bolted to the flange surface and insulted with kapton tape where the strip contacts the clamp.

4K - Below the 4K flange clamp there is copper strip that is soldered to the superconducting magnet wire (NbTi) over a length of approx. 10cm.

Magnet - The magnet has length of 248mm and a diameter of 170mm. There are approx. 820 turns. The wire is 0.5mm NbTi in copper cladding. The field strength is about 3.4 mT/A.

Location: Nanotalo, 154e, Cryohall 

Contact person: Pertti Hakonen

NANO-Y

Main characteristics 

Base temperature: <20 mK (~7 mK with no microwave cabling)

Mixing chamber cooling power at 100 mK: 250 uW

4K-flange cooling power at 4K: >0.25 W

Cooldown time to base temperature: <24 hours

Measurement Circuitry 

Up to 4 coaxial high frequency output lines

Up to 8 coaxial (18GHz) attenuated high frequency input lines

Up to 24 DC measurement lines 

±9T magnet

Location: Nanotalo, 154e, Cryohall 

Contact person: Antti Laitinen

BlueFors Cryogenics home page

KVANTTI-DRY

General information

This dilution refrigerator was installed in 2012, replacing a venerable DRI-420 Dilution Refrigerator System (S.H.E. Corporation).

The KVANTTI-DRY dilution refrigerator is used for microwave-range measurements (4-8 GHz) on superconducting circuits (qubits and resonators).

Main characteristics

Kvantti-Dry is a BlueFors BF-LD250 series dilution refrigerator. It has the following cryogenic parameters:

Mixing chamber base temperature = 10 mK

Cooling power at 100 mK = 250 μW

Cooldown time to base temperature = 18 hours

The refrigerator uses a mechanically-decoupled pulse tube from Cryomech and an automated gas handling system.

Instrumentation

The refrigerator is equipped with one microwave measuring line with isolators and a cryogenic amplifier with bandwith of 4-8 GHz.

Location: Nanotalo, 156b, Cryohall 

Contact person: Sorin Paraoanu

NEMS-DRY

Main characteristics 

Base temperature: <20 mK (~7 mK with no microwave cabling)

Mixing chamber cooling power at 100 mK: 250 uW

4K-flange cooling power at 4K: >0.25 W

Cooldown time to base temperature: <24 hours

Measurement Circuitry 

Up to 4 coaxial high frequency output lines

Up to 8 coaxial (18GHz) attenuated high frequency input lines

Up to 24 DC measurement lines

Location: Nanotalo, 156e, Cryohall 

Contact person: Mika Sillanpää

BlueFors Cryogenics home page

PICO-3

General Information

Pico-dry have been installed in its current location in 2012. The fridge, because of its large volume and nice cooling power is dedicated to microwave measurements of NIS junction and low noise squid pump (which require large bandwidth RF lines). Dry fridge technology allows to performed measurements during several weeks without any need of filling, making it a good candidate for long measurements.

Main characteristics 

Pico-dry is a Bluefors BF-SD dilution fridge 

Continuous base temperature 18 mK (dilution refrigerator)

Cooling power at 100 mK: 250 µW

Cooldown time to base temperature: about 1 day

Pulse tube cryocooler

Two sample stages, both including 12 filtered DC lines and RF lines abilities

Instrumentation 

DC setup

SIM900 + 4xSIM928 modules ( Battery powered voltage source)

Dedicated low noise current and voltage amplifier (DL instruments)

SRS830 lock-in amplifier

FLUKE 45 /Agilent 34410A Multimeters

Agilent 33220A signal generator

RF setup

The RF Setup have been design to work around 400-800MHz. The setup is easily changeable due to the large number of RF lines. The Measurements are performed by the use of Aeroflex modules ( Digitizer-Signal generator) embedded in a PXI-Rack ( PCI extension). 

Custom Quinstar cold amplifier ( in reparation)

Custom circulator mounted on the still plate ( 600mK)

Low noise amplifier operating at nitrogen temperature

6 complete RF lines with specific filters, from room temperature to base temperature

Temperature measurement

2 carbon resistor thermometers in Pulse tube plate and still chamber

PT1000 thermometer for high temperature measurement ( 300K-77K)

Low temperature measurements using RuOx thermometers (<4K)

CBT ( mounted permanently) used as a primary thermometer down to 10mK

All thermometers can be read simultaneously and in real time using Lakeshore 370AC bridge.

Location: Micronova, 4142 

Contact person: Joonas Peltonen

FinCryo

Main characteristics

Base temperature: 10 mK (with microwave cabling) 

Mixing chamber cooling power at 100 mK: 250 uW 

Cooling power at 4.2K: >0.5 W 

Cooldown time to base temperature: 26 hours 

Measurement Circuitry

Up to 2 coaxial high frequency output lines

Up to 8 coaxial (18GHz) attenuated high frequency input lines

Up to 48 DC measurement lines

Sample holder for DC measurements with 12 thermocoax lines

Location: Nanotalo, 156g, Cryohall

Contact person: Alexander Savin

This service is provided by:

Low Temperature Laboratory

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