Project JUNO: CDR’s centrifugal pumps to study neutrinos in China

The Jiangmen Underground Neutrino Observatory (JUNO), is an experiment that will be lead with the collaboration of INFN, the Italian institute for Nuclear physics.

CDR’s centrifugal pumps will be employed on a giant underground neutrinos’ detector for stripping, the technology used will be the same one used for Borexino, at national laboratory of Gran Sasso. To intercept neutrinos, twenty thousand tons of stripping fluid will be canalized into a 40 metres diameter sphere. All around, twenty thousand photo-multipliers will measure the interaction between the fluid and the neutrinos. The pump model chosen is the UTN-BL 40-25-160 in Pfa.

Why choose a magnetic drive centrifugal pump? And why Pfa?

The lined part is made of Pfa, and it has been chosen for its high chemical compatibility, while the magnetic drive guarantee a perfect isolation of the pump casing from the shaft and the external environment. The impeller, indeed, is dragged by the interaction between the magnets, not by the shaft. The isolation shell is placed between those ones, in order to guarantee the isolation of the fluid and avoid any possible leak. This kind of isolation is crucial for the experiment to be successful.

The magnetic drive pumps have been tested by the national institute for Nuclear physics throughout a helium leak detector to evaluate them to be completely flood-proof. All the tests have been positive, no leak of fluid have been registered. The registered value was 2,5𝑥10−8 mbar L / s. Pumps have been assembled through manned assembly, in partnership with our client, to guarantee an high level of hygiene and neatness.

Let’s deepen the nature of this important experiment. JUNO is an experiment with several scientific purposes for physics research.

JUNO project

The main goal is to determine the hierarchy of the neutrinos’ masses, throughout anti-neutrinos generated by nuclear fission from two nuclear reactor placed 53 km far away from the lab, on the southern coast of China. The experiment has the aim to research and discover the features of this elementary particle which, due to its low probability to interact with matter, remains fleeing and difficult to detect. The only way to detect neutrinos is through enormous underground devices, in order to escape cosmic radiation.

centrifugal pump for JUNO project