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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.