Abstract
The possible use of open-cell conductive foams in high synchrotron radiation particle accelerator beam liners is considered. Available materials and modeling tools are reviewed, potential pros and cons are discussed, and preliminary conclusions are drawn.
Highlights
Molecular gas desorption from the beam pipe wall due to synchrotron radiation should be properly taken into account in the design of high-energy particle accelerators and storage rings
In the CERN Large Hadron Collider [3] a copper-coated stainless steel beam screen is kept at ≈20 K by active Helium cooling, and effectively handles the heat load represented by synchrotron radiation, photoelectrons, and image-charge losses
A large number (∼102 m−1) of tiny slots are drilled in the beam screen wall in order to maintain the desorbed gas densities below a critical level (e.g., ∼1015 molecules=m3 for H2) by allowing desorbed gas to be continuously cryopumped toward the stainless steel cold bore of the superconducting magnets, which is kept at 1.9 K by superfluid helium
Summary
Molecular gas desorption from the beam pipe wall due to synchrotron radiation should be properly taken into account in the design of high-energy particle accelerators and storage rings. A large number (∼102 m−1) of tiny slots are drilled in the beam screen wall (see Fig. 1) in order to maintain the desorbed gas densities below a critical level (e.g., ∼1015 molecules=m3 for H2) by allowing desorbed gas to be continuously cryopumped toward the stainless steel cold bore (coaxial to the beam screen) of the superconducting magnets, which is kept at 1.9 K by superfluid helium. Such critical density levels, nuclear scattering in the residual gas would limit the beam luminosity lifetime, eventually originate high-energy protons which may cause thermal runaway, and cause quenching of the superconducting magnets. In this paper we present a brief review of open cell conducting foams’ properties and modeling tools and discuss at a very preliminary level the pros and cons of their possible use in high synchrotron radiation accelerators
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