  ITER-like tungsten Langmuir probes (W DLPs) have been installed and tested at
the lower divertor horizontal target composed of flat-type components in EAST.
Due to the non-active cooling, transient thermal and stress\strain analyses
considering actual thermal loading and cooling conditions were thus conducted
to evaluate the thermal performance and mechanical quality of W DLPs subjected
to the long pulse & high plasma flux of EAST. The thermal analysis reveals that
the inevitable leading edge induced thermal loading at surrounding area of W
DLPs is not ignorable. The thermal performance of W DLPs are largely related to
the plasma scenario (Qp: parallel heat flux along magnetic field line,
{\alpha}: incline angle of magnetic field line). Under current plasma
parameters, melting of W was not occurred in general, but recrystallization as
well as the induced cracks may be still possible. And, the interval period
(~1000 s) between neighboring shots is sufficient for nature cooling of W DLPs.
The stress analysis also tells that the ceramic LLL may be general a crucial
weak point of W DLPs, which is expected to not only limit the thermal
affordability of long pulse but also cause possible crack problems. Such
calculation results can provide important reference for current plasma
operation and future improvement of the W DLPs.
