Dott. Marco Angelucci
The Electron Ion Collider (EIC) is designed with the capability to investigate polarized electron-proton and electron-ion collision and to understand how the properties of matter originate from the deeply fundamental constituents of strong interactions.
The high current of the proton beams, with large number of short and high intensity bunches, may result in unacceptably high dynamic heat load for the RHIC existing beam pipes. To reduce this heat load, a beam screen with lower resistive-wall impedance needs be inserted. Such beam screen should grant low impedance to limit dynamic heat load to the cryogenic system and to avoid impedance-driven instabilities, but also to mitigate electron-cloud build-up and ensure adequate vacuum level and stability.
In this context, a stainless-steel beam screen with co-laminated copper and a thin amorphous carbon (aC) coating have been proposed. An intense R&D campaign has been lunched to produce a-C surface characteristics compliant with the aforementioned requirements.
After giving an overview of EIC features, here I report on the project activities carried out at the Material Surface Science Laboratory of LNF in collaboration with Brookhaven National Laboratory (BNL).