Ji, Y. Spentzouris, L.K. Zwaska, R.M. JACoW Geneva, Switzerland 978-3-95450-180-9 10.18429/JACoW-NAPAC2016-TUPOB63 English 632-635 TUPOB63 ion electron dipole simulation proton Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-NAPAC2016-TUPOB63 https://jacow.org/napac2016/papers/tupob63.pdf The Fermilab accelerator complex is currently undergoing an upgrade from 400kW to 700kW. This intensity could push operations into the region where electron cloud (e-cloud) generation could be observed and even cause instabilities. The POSINST simulation code was used to study how in- creasing beam intensities will affect electron cloud genera- tion. Threshold simulations show how the e-cloud density depend on the beam intensity and secondary electron yield (SEY) in the Main Injector (MI) and Recycler Ring (RR).