Penning trap doesn't work with FEM

[s-mayani]

The Penning Trap mini-app does not work with the FEM solver, producing the following error when running serial CPU:

Pre Run> Discretization:
Pre Run> nt 200 Np= 655360 grid = ( 33 , 33 , 33 )
Initialize Particles> particles created and initial conditions assigned
scatter > 3.52788
PenningTrap> Starting iterations ...
Pre-step> Done
scatter > 101346
Post-step:> Finished time step: 1 time: 0.00488281
Pre-step> Done
[Sonalis-MacBook-Pro:31897] *** Process received signal ***
[Sonalis-MacBook-Pro:31897] Signal: Bus error: 10 (10)
[Sonalis-MacBook-Pro:31897] Signal code: Invalid address alignment (1)
[Sonalis-MacBook-Pro:31897] Failing at address: 0x9d3ca58b8
[Sonalis-MacBook-Pro:31897] [ 0] 0   libsystem_platform.dylib            0x000000018a5b57a4 _sigtramp + 56
[Sonalis-MacBook-Pro:31897] [ 1] 0   ???                                 0x00000009d2b68080 0x0 + 42189881472
[Sonalis-MacBook-Pro:31897] [ 2] 0   PenningTrap                         0x0000000102a335f4 .omp_outlined..295 + 204
[Sonalis-MacBook-Pro:31897] [ 3] 0   libomp.dylib                        0x0000000102ea5bbc __kmp_invoke_microtask + 156
[Sonalis-MacBook-Pro:31897] [ 4] 0   ???                                 0x000000016d429cf0 0x0 + 6128049392
[Sonalis-MacBook-Pro:31897] *** End of error message ***

Command line args: ./PenningTrap 33 33 33 655360 200 FEM 0.05 LeapFrog --overallocate 1.0 --info 5