Hi,

I would like to use the PIC solver in order to simulate the interaction between a Bessel beam and a counter propagating electron beam in free space. From different papers I read, I found that simulations of laser acceleration of particles is possible in CST Studio Suite, but I didn't find any information regarding the simulation of Bessel beams (without using special lenses). My questions are: 

1. Is this kind of simulation practical?  

2. If it is - what excitation source should I use? I read about waveguide ports and imported fields and I am not sure what can suit this problem best. I should note that I have the exact analytic expression for the desired Bessel beam.  

Thanks in advance.