Proposal for an aluminum beam screen in the LHC

This paper proposes a cold beam screen made of high strength, high electrical resistivity aluminum alloy (such as A7N01) as an alternative to the present LHC design that is based on a copper co-laminated high Mn content stainless steel. The main advantages of an aluminum screen are: simple manufacturing processes, low cost, elimination of millions of small slots and of TEM waves, no adhesion problem, no helium leak problem (vacuum tight), non-magnetic, and others. The available aperture is equivalent to the present design when a non-uniform wall thickness is adopted. A prototype was built to demonstrate the design and the end connections. Concerns about the multifactoring, electron cloud instability, surface resistance and cryopumping using anodized aluminum are addressed