Computational Analysis of CesrTA Electron Cloud-Induced Tune Shift Effects with POSINST

Electron clouds pose a significant problem for high-energy lepton colliders, including the proposed International Linear Collider. The Cornell Electron Storage Ring Test Accelerator is able to study the dynamics of such clouds by measuring their effect on the tune of particle bunch trains. Key parameter values characterizing electron clouds can be estimated using numerical simulations of the observed tune shift. The POSINST electron cloud simulation suite was used in conjunction with a six-dimensional variant of Newton’s method to better determine the value of parameters including the peak secondary electron emission yield and the incident energy of peak yield. The most influential parameters appear to be the energy at which the secondary yield peaks and the secondary emission yield at that peak. Simulations suggest optimal values of 270-310 eV and 2.3 for these parameters respectively.