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Low noise and non metallic liquid-helium cryostat
Industry and Research Institutes
Dr. rer. nat. Andreas Kade
Low-noise Magnetic Field Cryostat for SQUID-Applications
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.
- 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
Technical Data for the Cryostats
|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 / Hz½|
|helium leak test (He-vessel)||< 1 × 10-11 mbar l / s|
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.