[en] At present, the AR of TRISTAN is operated at the beam energy 6.5 GeV and the beam current 30 mA. At this time, the power of the synchrotron radiation generated by the beam bent with deflection magnets is 1.4 kW/m. The absorbers fixed for protecting the ceramic chamber were damaged by thermal load, therefore, it was decided to develop the absorbers that can withstand synchrotron radiation and cope with the increase of beam intensity. There are the absorbers made of copper-aluminum clad material and the absorbers made of aluminum alloy. The state of damage due to thermal load of the absorbers is explained. The three-dimensional thermal analysis by finite element method and the thermal load test with 100 keV electron beam on the absorbers of both materials are reported. The improved type absorbers for the AR ceramic chamber are the combination of aluminum alloy absorbers and copper-aluminum absorbers, and the limiting condition of use becomes 6.5 GeV, 50 mA. (K.I.)