This work demonstrates that the α coefficient used to characterize the heat transmission capacity of the unknown deposited layer growing on the surface of divertor plates has obvious effect on the calculated peak heat flux value, while has little influence on the fitted heat flux widths.

Meanwhile, we find that the heat flux widths on lower outer divertor plates are larger than those of lower inner targets by a factor of 2, and both the ELM-averaged heat flux widths and those of inter-ELM phases on lower inner targets in type-I ELMy H-modes are similar, in magnitude, for the two cases.

Also, both λ_q and S have strong inverse dependence on plasma current I_p, with S seeming to scale with connection length from divertor entrance to target plates, and the linear regressions of S to I_p for type-I and type-III ELMy H-modes show a good consistency both in magnitude and tendency.

A comparative study of calculated λ_int to those derived from the fitted λ_q and S shows that the experimental data are in good agreement with Makowski mathematical relationship.