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particle tracing in ExB-field

Posted Nov 12, 2009, 3:04 a.m. EST 2 Replies

Albert Rauch
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Hallo everybody

I have just joined the forum and I´am really new with comsol multiphysics so I need some help.

I like to do particle tracing in a electric&magnetic-field. The model consists of two electrodes, with opposite electrostatic potentials and a permanent magnet.
I can solve the two fields separate with comsol AC/DC-module in 3D. Now I like to combine the electric and magnetic field. Is it possible to do this in 3D?

Many thanks for your help in advance!

Best regards
Albert Rauch
2 Replies Last Post Jan 18, 2010, 3:46 a.m. EST
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Hello Albert Rauch

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Mike McDonald
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Posted: 1 decade ago Jan 5, 2010, 6:21 p.m. EST
-bump-

I'd love to know how to do this too, I have the same problem. I actually have a set of E- and B-field values, and I'd like to do particle seeding and tracing and visualize the trajectories. It's not clear whether it's enough to simply include the electrostatics and magnetostatics packages in multiphysics, and the closest model library example, the magnetic quadrupole lens, is difficult to deduce anything from since it does not include E-fields.

Any insight on this would be greatly appreciated.

Mike McDonald
-bump- I'd love to know how to do this too, I have the same problem. I actually have a set of E- and B-field values, and I'd like to do particle seeding and tracing and visualize the trajectories. It's not clear whether it's enough to simply include the electrostatics and magnetostatics packages in multiphysics, and the closest model library example, the magnetic quadrupole lens, is difficult to deduce anything from since it does not include E-fields. Any insight on this would be greatly appreciated. Mike McDonald
Albert Rauch
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Posted: 1 decade ago Jan 18, 2010, 3:46 a.m. EST
Hello Mike

Sorry for writing you so late. I think I solved my problem with the particle tracing in an ExB-field.
In the Model navigator I add from the AC/DC-Module -> Statics the two components “Electrostatics (emes)” and the “ Magnetostatics, no currents”. Afterwards I draw the Geometrie and do the Subdomain and Boundary Settings and solved the problem with “Conjugate gradients”.

In Postprocessing->Plot Parameters->Particle Tracing->Equation of motion I wrote for
Fx: partq*(partv*Bz_emnc-partw*By_emnc)+partq*Ex_emes
Fy: partq*(partw*Bx_emnc-partu*Bz_emnc)+partq*Ey_emes
Fz: partq*(partu*By_emnc-partv*Bx_emnc)+partq*Ez_emes

Good luck
Albert
Hello Mike Sorry for writing you so late. I think I solved my problem with the particle tracing in an ExB-field. In the Model navigator I add from the AC/DC-Module -> Statics the two components “Electrostatics (emes)” and the “ Magnetostatics, no currents”. Afterwards I draw the Geometrie and do the Subdomain and Boundary Settings and solved the problem with “Conjugate gradients”. In Postprocessing->Plot Parameters->Particle Tracing->Equation of motion I wrote for Fx: partq*(partv*Bz_emnc-partw*By_emnc)+partq*Ex_emes Fy: partq*(partw*Bx_emnc-partu*Bz_emnc)+partq*Ey_emes Fz: partq*(partu*By_emnc-partv*Bx_emnc)+partq*Ez_emes Good luck Albert

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