The beam dump for strange P-pol ghost beam from IFI had been broken (15543) may be due to high-power beam mis-input (once detaced 16920). Today I replaced those broken glasses with new KG5 ones, and re-installed the beam dump assembly back in the IMM chamber (see the attached photos). But may be the glass parts have to be replaced with SiC for safety for heigher power beam input in the future...