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 circulator to condition the flow on the beam screen. The beam screen is inserted into a double-walled cold bore that contains the pressurised He II bath, that is in turn connected to the He II saturated bath by the heatmeter.
Measurement Report link
Other useful links
Pictures