Changes to beam line parameters can be applied using the python interface. For example to change the strength of a quadrupole one can use the following.
line['myquad'].knl[1] = 0.5This approach works well when the change is applied to a small number of elements,
but can introduce a significant overhead on the simulation time when the number of
changes is very large. For these cases it is possible to use an xtrack.MultiSetter
to perform the changes in a more efficient way. The MultiSetter stores the
memory addresses of the quantities to be changed and performs the changes with a single
compiled kernel, using multithreading when allowed by the context.
The following example shows how to use the MultiSetter to apply a sinusoidal
ripple to the strength of several quadropoles of a synchrotron.
.. literalinclude:: generated_code_snippets/ripple.py :language: python