Suppression of the Effective Secondary Emission Yield for a Grooved Metal Surface∗

Suppression of the secondary electron emission is an important technique of mitigating deleterious effect of the electron cloud in modern accelerators. Several methods are routinely used in practice to lower the secondary emission yield (SEY) which include special coatings of the metal surface, surface cleaning and beam scrubbing. In this paper we study another approach to suppress effective SEY which uses grooves on the surface of the metal. This method can complement the surface coating and lead to even smaller total secondary emission. The idea of using grooves to lower the electron emission has been previously discussed in the literature [1, 2]. In a recent paper [2] Krasnov developed an analytical model which demonstrates lower SEY as a function of the geometric characteristics of the grooves. Our analysis in this paper is based on a computer simulation which tracks orbits of the secondary electrons and uses a detailed model for the energy and angular distiribution of the secondaries [3].