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Adding Friction in Certain Direction (Charged Particle Tracing)

Posted 26 mai 2025, 01:32 UTC−4 Electromagnetics, Charged Particle Tracing, Modeling Workflow 0 Replies

Zhiyi Xiao
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Hi there,

I'm trying to simulate ion movement in electromagnetic fields using Charged Particle Tracing module. The ion is subject to two kinds of forces:

  • DC and RF fields, generated by the electrodes

  • Laser cooling forces, which can be approximated as friction

Due to experimental limitations, the laser cooling force can only be applied in a certain direction. However, it seems that I can only add homogeneous friction (using the collision model) in Charged Particle Tracing module.

Now I want to add a friction force =-βvx, where vx being the ion's velocity in x direction, and β is the proportionality constant. Is there a way to do that?

Thanks a lot in advance!

0 Replies Last Post 26 mai 2025, 01:32 UTC−4
COMSOL Moderator

Hello Zhiyi Xiao

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