Simulations of particle loss due to hollow e-lens and non-linearities for the HL-LHC

Simulations on the effects of an electron lens (e-lens) on the halo population depletion have been carried out for the High Luminosity LHC (HL-LHC). In particular, the different operational modes, and the interaction with the non-linearities introduced by octupoles and chromaticity have been explored. This study has found that the random activation of the electron beam removes completely the halo above its inner radius on a timescale of 10 s. For all other operational modes, the octupole current variation increases the loss to higher values and to different rates depending on the specific mode and current value. Also, the increase of chromaticity causes a growth in population loss. Finally, an estimation is given for chromaticity and octupole current at HL-LHC baseline values.