(a)
(b)
Figure 4:
Calculated
𝑁
𝑠
=
1
0
-field at the center of the coil. (a) PML with
𝐵
1
and
𝑁
𝑝
=
5
. The
𝑁
𝑠
=
5
-field is stable after 40 000 time steps; (b) PML with
𝐵
1
and
𝐵
1
. The
𝑁
𝑝
-field increases monotonically even after 100 000 time steps.