MODEL OFELECTRON CLOUD BUILDUPWITH SECONDARY ION- ELECTRON EMISSIONASA SOURCEOFDELAYED ELECTRONS

Beamparticle leaking tothegapandanomaly high reflectivity oflowenergy electrons incollision withpipe wallwasproposed asexplanation ofanomalously long electron cloudsurvival after thegapbetween bunches. Another possibility ofsecondary electron generation with alongdelay timeafter bunchpassing isthesecondary ion-electron emission. Themodelofelectron cloud build upwithsecondary ion-electron emission asthesource of delayed electrons ispresented anddiscussed. Thismodel canbeusedfortheexplanation ofbunched beam instability inLosAlamos PSRwithelectron survival after thegap,fortheprediction ofe-cloud generation inSNS, andcanbeimportant forthepressure rise inwarmand coldsections ofRHIC.A fastdesorbtion byionof physically adsorbed molecules canexplain the"first pulse instability" observed inLAPSR.