parametric sweep with charged particle tracing

Hello, i have 2 studies in my model:
1) A study that calculates electric and magnetic fields
2) A study that calculates charged particle tracing only with the fields from 1)

now i would like to parametric sweep a part of my model geometry and see how it affects particle trajectories. to do so i obviously have to create a parametric sweep in study 1) to sweep the e/m fields. this works fine.

my problem is that i dont know how to carry over the sweep of the e/m fields of 1) to the trajectories in 2). when i just create another sweep of the same kind in study 2) it is possible to watch the geometry sweep in the particle tracing plot but the trajectories do not change with the sweep because appearently the sweep of 2) does not affect the e/m fields even though it works fien in the sweep of 1).

any ideas for a parametric sweep of a particle tracing?