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Charged Particle Tracing Problems

Posted 22 mai 2014, 17:51 UTC−4 Low-Frequency Electromagnetics, Charged Particle Tracing, Particle Tracing for Fluid Flow Version 4.3b 2 Replies

Richard Thai
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I am trying to simulate the trajectory of a charged particle due to an electric and magnetic field. The magnetic field is due to a multi turn coil, so I used the (mf) study for that. My electric field is from voltage sources, which I made a separate study for using the (es) study.

When I setup the particle tracing, I do not solve for the electric of magnetic fields. I check off "Values of variables not solved for" and I can choose EITHER es or mf solution and not both at the same time. I need to be able use them both at the same time when simulating the trajectory. Any ideas on how to do this? I am quite new to COMSOL.
2 Replies Last Post 23 mai 2014, 12:48 UTC−4
Daniel Smith COMSOL Employee

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Posted: 1 decade ago 23 mai 2014, 11:21 UTC−4
Hi Richard, if you have separate studies for computing the magnetic fields and electric fields, then you just need to pass the solution from the magnetic fields study into the study computing the electric fields, then pass that solution into the study which computes the particle trajectories.

There is a Model Library example which demonstrates how to pass the solution from 2 prior studies into a third one. The model requires the AC/DC and Particle Tracing Modules.

www.comsol.com/model/particle-tracing-in-a-quadrupole-mass-spectrometer-10653
Hi Richard, if you have separate studies for computing the magnetic fields and electric fields, then you just need to pass the solution from the magnetic fields study into the study computing the electric fields, then pass that solution into the study which computes the particle trajectories. There is a Model Library example which demonstrates how to pass the solution from 2 prior studies into a third one. The model requires the AC/DC and Particle Tracing Modules. http://www.comsol.com/model/particle-tracing-in-a-quadrupole-mass-spectrometer-10653
Richard Thai
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Posted: 1 decade ago 23 mai 2014, 12:48 UTC−4

Hi Richard, if you have separate studies for computing the magnetic fields and electric fields, then you just need to pass the solution from the magnetic fields study into the study computing the electric fields, then pass that solution into the study which computes the particle trajectories.

There is a Model Library example which demonstrates how to pass the solution from 2 prior studies into a third one. The model requires the AC/DC and Particle Tracing Modules.

www.comsol.com/model/particle-tracing-in-a-quadrupole-mass-spectrometer-10653


Thank you! That worked. The only issue I have right now is that my current is not flowing the right direction for my multiturn coil. I chose a reference edge, and it is clockwise. I would like the current to flow counter clockwise, so I have tried to do this by applying a negative current, but it still gives me the wrong result (current still flowing clockwise).
[QUOTE] Hi Richard, if you have separate studies for computing the magnetic fields and electric fields, then you just need to pass the solution from the magnetic fields study into the study computing the electric fields, then pass that solution into the study which computes the particle trajectories. There is a Model Library example which demonstrates how to pass the solution from 2 prior studies into a third one. The model requires the AC/DC and Particle Tracing Modules. http://www.comsol.com/model/particle-tracing-in-a-quadrupole-mass-spectrometer-10653 [/QUOTE] Thank you! That worked. The only issue I have right now is that my current is not flowing the right direction for my multiturn coil. I chose a reference edge, and it is clockwise. I would like the current to flow counter clockwise, so I have tried to do this by applying a negative current, but it still gives me the wrong result (current still flowing clockwise).

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