Speaker
Description
Intrinsic impurities in a magnetically confined fusion (MCF) plasma dilute the reaction fuel in the hot plasma core and, through their radiation, are detrimental to global energy confinement. Thus, the radiative patterns of impurity elements in a fusion plasma must be understood across the full range of temperatures achieved in present day MCF experiments.
For this purpose, we present a comprehensive atomic processes investigation of tungsten ions (W$^{44+}$-W$^{47+}$,W$^{62+}$-W$^{65+}$) in ITER plasmas. Using the FAC code, we calculated excitation rate coefficients and radiative transition rates, then solved the collisional-radiative model (CR) to derive emission spectra across 100 eV–100 keV. Prominent spectral lines were identified, and their photon emissivity coefficients (PEC) were evaluated. Then by employing the Integrated Modelling & Analysis Suite (IMAS) database for the given simulation "shot", 7.5 MA scenario with impurity concentrations ( W: 10−4) and Te and ne profiles, we computed emissivity profiles for key spectral lines. This work provides critical atomic data for diagnosing impurity transport and radiation losses in ITER, benchmarking CR model and FAC calculation with ADAS database. Finally, by integrating the radial profile and the line of sight of the X-ray spectrometer, line integrated spectra with high spatial resolution were obtained.
The results highlight the role of charge-state distribution and line emission in fusion-grade plasmas, supporting spectroscopic diagnostics for ITER.
| Speaker's email address | runjia.bao@ipp.ac.cn |
|---|---|
| Speaker's Affiliation | Institute of Plasma Physics, Chinese Academy of Sciences |
| Member State or International Organizations | China |
