The characteristics of wall recycling with different divertor configurations
were investigated in this study, focusing on the observations of the spatial
distributions of deuterium atomic emissions in the Balmer series (D_{\alpha},
D_{\beta}, D_{\gamma}, and D_{\delta}) with different magnetic field
configurations in the Experimental Advanced Superconducting Tokamak. The
observed D_{\alpha} and D_{\beta} emissions were primarily relatively close to
the divertor targets, while the D_{\gamma} and D_{\delta} emissions were
primarily relatively close to the X-point. The distributions of the emissions
close to the divertor targets and X-point changed differently depending on the
divertor configuration. These experimental results indicate that the linear
comparison of parameters based on an assumption of similarity of profile shapes
in different configurations is insufficient for understanding particle
recycling in divertor plasmas. This is because the shape of the density profile
of the recycled deuterium atoms and/or the electron density and temperature may
change when the magnetic configuration is altered.