Category: Article
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Measurement station for the critical temperature of SC thin films on copper for SRF applications
A consistent R&D program for the development of SC thin-film coated copper cavities is ongoing at CERN, which implies the synergy of the Vacuum, Surfaces and Coatings, Radio Frequency, Cryogenics and Mechanical and Materials Engineering groups. The measurement of the Tc is needed as first assessment of the film quality, and can turn out to…
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RRR – Bulk material
Insert placed in a vacuum vessel. Samples are cooled via a phase separator continuously fed to provide evaporative cooling. The samples reach a minimum temperature of 6 K, with a thermal shield enclosing the experimental platform. Up to six samples can be measured simultaneously. The maximum supply current is 5 A. The samples need to…
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RRR – Thin Foils
Test stand to determine RRR of thin foils. All samples are biased in series with 100 mA current and the voltage drop along a length of 80 mm is measured by small, pin-like taps. The insert is directly immersed in liquid helium, with a copper cylinder acting as a “convection shield” to minimise convection phenomena…
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Beam Screens for inner triplets of HL-LHC
Validation of the thermal performance of the beam screens for the inner triplets of the HL-LHC was completed in March 2019. A horizontal cryostat was refurbished for this project, including a separate cryostat that houses superfluid helium circuits that simulate the cold bore environment in the HL-LHC and a new pulse tube refrigerator and cold…
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RRR test stand – Films on dielectric substrate
The sample characteristics should comply with : Caractéristiques des échantillons:
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Thermal conductivity test stand
This multipurpose cryocooler-based measurement test stand is able to provide a measurement platform in a wide temperature range from 2.7 K to 200 K, with an additional point at room temperature. Thermal conductivity measurements can be carried out in either steady state, quasi steady state or transient conditions; thermal diffusivity measurements are also possible. The…