Abstract
An electron-beam ion trap (EBIT) is used to measure extreme ultraviolet spectra between 10 and 25 nm from highly charged ions of tungsten with an open $3d$ shell (W xlviii through W lvi). We found that almost all strong lines are due to the forbidden magnetic-dipole ($M1$) transitions within $3{d}^{n}$ ground configurations. A total of 37 previously unknown spectral lines are identified using detailed collisional-radiative (CR) modeling of the EBIT spectra. A level-merging scheme for compactification of rate equations is described. The CR simulations for Maxwellian plasmas show that several line ratios involving these $M1$ lines can be used to reliably diagnose temperature and density in hot fusion devices.
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