The end goal that I have is to produce a magnetic field map for a superconducting magnet. In my first attempt, I tried to model the magnet coil packages (there are 11 of them) and the result was approximately 0.5 Tesla lower than the measured map and the calculated map from the manufacturer (it should be 5T maximum, but comsol gives something like 4.5T).
I then tried to model a simple system to see if I get an answer that I expect, so I tried Helmholtz coils. I again got a result that was approximately 10% low for the field at the center between the two coils. I then thought that perhaps I was doing something else wrong and tried to use the Helmholtz coil tutorial, but found that it produced a similar result (10% low).
The entire helmholtz geometry is contained inside a 1m sphere with 20cm coils. The sphere is centered on the center between the coils. I added a 10cm thick layer to this outer sphere and then added an infinite element domain to this layer. I re-ran the simulation and the result was once again 10% low. Is there something wrong with my implementation of the infinite element that prevents it from being correctly interpreted?
Thanks for your help.
I then tried to model a simple system to see if I get an answer that I expect, so I tried Helmholtz coils. I again got a result that was approximately 10% low for the field at the center between the two coils. I then thought that perhaps I was doing something else wrong and tried to use the Helmholtz coil tutorial, but found that it produced a similar result (10% low).
The entire helmholtz geometry is contained inside a 1m sphere with 20cm coils. The sphere is centered on the center between the coils. I added a 10cm thick layer to this outer sphere and then added an infinite element domain to this layer. I re-ran the simulation and the result was once again 10% low. Is there something wrong with my implementation of the infinite element that prevents it from being correctly interpreted?
Thanks for your help.