Current research projects

Development of a Cryogenic Magnetic Air Separation Unit

Hydrogen and methane testing field at the ILK

Refrigerants, lubricants and mixtures

Industry 4.0 membrane heat and mass exchanger (i-MWÜ4.0)

Lifetime prediction of hermetic compressor systems

Behavior of multiphase cryogenic fluids

In-situ investigation concerning the swelling behaviour of polymer materials under elevated pressures and temperatures

Measurements on ceiling mounted cooling systems

Innovative Parahydrogen Generator Based on Magnets

Investigation according to DIN EN ISO 14903

Tribological investigations of oil-refrigerant-material-systems

Brine (water)-water heat pump

Influenced melting point of water by magnetic field

Air-flow test rig for fan characteristic measurement

Certifiable connection types in cryogenics

Reducing the filling quantity

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Low noise and non metallic liquid-helium cryostat

Industry and Research Institutes

Dr. rer. nat. Andreas Kade

+49-351-4081-5117

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Low-noise Magnetic Field Cryostat for SQUID-Applications

Technical Data for the Cryostats

parameter	value
volume of liquid helium	5 to 12 litre (other volume possible)
time to complete evaporation of helium	3 to 7 days (depends on size)
heat load	0.1 W (in standby operation)
rate of helium evaporation	≤ 3 litre / day
holding time of the liquid helium	up to 4 days without refilling
initial noise of the cryostat	< 3 fT / Hz^½
helium leak test (He-vessel)	< 1 × 10^-11 mbar l / s

He-Cryostat, Height = 1000 mm, Diameter = 300 mm

ILK Dresden developed low noise magnetic field and non metallic helium cryostats made of GRP (glass reinforced plastics) with a high helium and vacuum holding time.

The cryostats can operate in a direction independent operation mode (tiltable arrangement) and hence they are suitable for a plurality of several applications.

The ILK concept offers much lower permeation rates inside the He-reservoir as comparable models from other manufacturers and is therefore perfect for SQUID (superconducting quantum interference device) applications and other long-term measurements.

The technical design of the cryostats is thus predestined for future sensor generation.

Specification

suitable for the cooling of SQUID-Sensors
non-metallic (GRP)
fast filling with LHe via thermosiphon
GRP exhaust gas cooled radiation shield for high efficiency.
small cold-warm distance feasible
low maintenance
other design variants possible on costumer request

Low noise magnetic field

The low-noise magnetic field of the cryostat was tested in the magnetically shielded room BMSR-1 of PTB Berlin and is smaller than the lowest resolution limit of the measurement system used, see figure below.