It seems both the version 2021.4 and 2022.0 give us completely identical output beam results using the lattice file 'linac.lte' that Petr shared, with the default 'PARALLEL_INTEGRATION=1' set for the IBSCATTER elements, as the distribution of the uncorrelated fractional energy spread that the attached .JPG image shows.
Thank you for finding this problem, and fortunately by using 75 instances of IBSCATTER the discrepancy did not occur to us.
Don't see expected IBS effect
Moderators: cyao, michael_borland
Re: Don't see expected IBS effect