DM Object: 1 MPI process
  type: da
Processor [0] M 8 N 8 m 1 n 1 w 2 s 1
X range of indices: 0 8, Y range of indices: 0 8
min: (0., 0., 0.) max: (1., 1., 0.)
DM Object: ions (pic_) 1 MPI process
  type: swarm
ions in 2 dimensions:
  Number of particles per rank: 16