Model of Electron Cloud Build up with Secondary Ion-Electron Emission as a Source of Delayed Electrons

Beam particle leaking to the gap and anomaly high reflectivity of low energy electrons in collision with pipe wall was proposed as explanation of anomalously long electron cloud survival after the gap between bunches. Another possibility of secondary electron generation with a long delay time after bunch passing is the secondary ion-electron emission. The model of electron cloud build up with secondary ion-electron emission as the source of delayed electrons is presented and discussed. This model can be used for the explanation of bunched beam instability in Los Alamos PSR with electron survival after the gap, for the prediction of e-cloud generation in SNS, and can be important for the pressure rise in warm and cold sections of RHIC. A fast desorbtion by ion of physically adsorbed molecules can explain the "first pulse instability" observed in LA PSR.