EXTREME ULTRAVIOLET SPECTROSCOPY
OF HIGLY CHARGED IONS AT THE NIST EBIT
Ilija N. Draganić1, Yuri Ralchenko1, John D. Gillaspy1, Joseph N. Tan1,
Joshua M. Pomeroy1, Joseph Reader1, Uri Feldman2 and Glenn E. Holland3
1National Institute of Standards and Technology, Gaithersburg, MD 20899-8422, USA
2Space Science Division, Naval Research Laboratory, Washington, DC 20375-5320, USA
3SFA Inc, Crofton, MD 21114, USA
The novel measurements and comprehensive line identifications of extreme ultraviolet (EUV) spectra of highly charged heavy ions produced in the electron beam ion trap (EBIT) at the National Institute of Standards and Technology are presented. The spectra of highly ionized tungsten W54+-W63+ in the EUV spectral range of 4-20 nm  were recorded with a grazing-incidence spectrometer . High charge states were achieved by selecting the energy of electron beam in the range of 8.8 keV to 25 keV. We observed the strong lines from Al-, Mg- and Na- like ions of tungsten (W), tantalum (Ta), hafnium (Hf) and gold (Au). Many of these lines have never been observed before. The detailed identification of the allowed (electric dipole) and forbidden (magnetic dipole) transitions were based on a collisional - radiative model of the EBIT plasma. The observed lines can be used for the high temperature plasma diagnostics and impurity transport studies in future nuclear fusion reactors, such as ITER.
 Yu. Ralchenko, I. N. Draganić, J N. Tan, J. D. Gillaspy, J. M. Pomeroy, J. Reader, U Feldman, and G. E. Holland, J. Phys. B: At. Mol. Opt. Phys. 41 (2008) 021003.
 B. Blagojević, et al., Rev. Sci. Instrum. 76 (2005) 083102.
Name: Ilija N. Draganic, Division: 842, Lab: Physics, Building / Room: 221 / B228, Mailstop: 8422,