FEM Simulation Movies

Commercial FEM programs, such as ANSYS and FEMLAB, are becomming very popular for the convenience of engineering. Recent developments are focused on the GUI features and the connectivity to the CAD system. Anybody can do the mechanical analysis or electro-magnetic analysis by the push of the button. FEM programs are mostly used for such pre-arranged problems. However, these programs have more versatility than usually considered. Actually FEM is applicable for any problem that is made complicated because of the geometry. 2D, 3D geometry of any problem can be handled by the FEM program if we create a proper element. Since various elements are provided by the program, macro programming can effectively do the modification of the elements. The results shown here are the simulations using ANSYS. Since these files are not so small, it may take some time to start the movie.
Quench of a race track magnet made at Fermilab. The design of this magnet is exactly the same as the magent built at LBNL. The current decay or energy dump of the protection system was turned off in this simulation but, of course, it can be turned on.

This is a diffusion of Sn in the reaction process of the Nb3Sn conductor. Tin concentration located in the three corners in the beginning diffuses into Nb filament area and the Nb turns into Nb3Sn. Details of the evelopment of Nb3Sn conductor is here
This is the penetration of flux into the multifilamentary superconductor. 7 filaments are located in a tube barrier. The flux penetrates from outside and the persistent currents are induced. The field goed up and dwon to make a complete cycle. This is still a on going work under development. Conductor magnetization is here .
Thermal stability of superconducting strand can be also simulated. This kind of simulation has been around for a single filament conductors or a simple one dimensional model. This simulation is for a real multi filament strand. Effect of copper RRR, location of stabilizer and others will become clear by this simulation. The result will be presented in MT19 conference. .
Acceleration of a super-bunch beam. A new scheme of beam accelelation with a very long bunch was demonstrated in KEK-PS. Acceleration and confinement are separated in this scheme and the induction cells are operated by switching power supply with square wave. All kind of beam handling become possible with this method. Digital acceleration is about to start. .