  New high-resolution x-ray spectra of Mo39+, Mo40+, W43+, W44+ and W45+ have
been carefully confirmed for the first time by use of the x-ray imaging crystal
spectrometer (XCS) in Experimental Advanced Superconducting Tokamak (EAST)
under various combined auxiliary heating plasmas conditions. Wavelength of
these new x-ray spectra is ranged from 3.895 {\AA} to 3.986 {\AA}. When core
electron temperature (Te0) reaches 6.0 keV, Mo39+ and Mo40+ lines of 3.9727,
3.9294 and 3.9480 {\AA} can be effectively detected on XCS for EAST; meanwhile,
line-integrated brightness of these spectral lines of Mo39+ and Mo40+ is very
considerable when electron temperature reaches 12.9 keV. Multi-components
spectral lines for W43+, W44+ and W45+ have also been identified when Te0
reaches 6 keV. Parts of spectral lines, such as Zn-1, Cu-2, Cu-4a, Cu-4d and
Cu-5 lines of tungsten, are first observed experimentally. When electron
temperature reaches 12.9 keV, line-integrated intensity for part of these
spectral lines of W43+, W44+ and W45+ are considerable. These experimental
results and theoretical predictions from FAC and FLYCHK codes are in good
general agreement. These new spectral lines, obtained on XCS for EAST, are
vital for deeply uncovering the mechanisms of ion and electron thermal, high-Z
impurity and momentum (anomalous) transport to achieve the advanced
steady-state operation scenarios for ITER and CFETR.
