Angular Dependence of Secondary Electron Emission from Cu Surfaces Induced by Electron Bombardment

Commisso, Mario; Barone, Pasquale; Bonanno, Assunta; Cimino, Roberto; Minniti, Marina; Oliva, Antonino; Riccardi, Pierfrancesco; Xu, Fang; Grosso, Davide Italy

We report a study of electron emission from metal surfaces induced by electron beams as a function of angular geometry. This study permit to add crucial information about Electron Cloud effect in particle accelerators since we are able to study separately the angular dependence of the various contributions to electron emission from reflected electron, rediffused and true-secondary electrons. We not only observe that the three contributions have different angular dependence but that, in some cases, the observed behaviour depends on the energy of the impinging electron beams. The origins of such differences and the implications to e-cloud simulation codes are extensively discussed and addressed.

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