Variables of incident particles in OPAL-t elements
Position and time variables of incident particles in OPAL-t elements must be adjusted to correspond to the physical boundary of the element.
There are different ways of saving the particles according to each element:
MONITOR implementation is correct,
FLEXIBLECOLLIMATOR records one step after the element input,
DEGRADER currently do not save incident particles.
All elements should have the same structure to store the incident particles in the output file.