Search for New e-cloud Mitigator Materials for High Intensity Particle Accelerators

Electron cloud has a ubiquitous effect in positively charged particle accelerators and has been observed to induce unwanted detrimental effects on beam quality, sta- bility, vacuum etc. A great effort has been recently devoted to the search of new material morphology and/or coatings which can intrinsically mitigate beam instabilities deriving from electron cloud effects. In this context, we present some characterization of commercially available Cu foams and their qualification mainly in terms of secondary elec- tron yield (SEY), along with the vacuum behavior, their impact on the impedance budget, photo-desorption yield, etc. More experimental efforts are required to finally qual- ify foams as a mature technology to be integrated into accelerator systems. Our preliminary results suggest po- tentially interesting use in the accelerator technology.