Rest-wavelength fiducials for the ITER core imaging x-ray spectrometer

Abstract

Absolute wavelength references are needed to derive the plasma velocities from the Doppler shift of a given line emitted by a moving plasma. We show that such reference standards exist for the strongest x-ray line in neonlike W(64+), which has become the line of choice for the ITER (Latin "the way") core imaging x-ray spectrometer. Close-by standards are the Hf Lβ(3) line and the Ir Lα(2) line, which bracket the W(64+) line by ±30 eV; other standards are given by the Ir Lα(1) and Lα(2) lines and the Hf Lβ(1) and Lβ(2) lines, which bracket the W(64+) line by ±40 and ±160 eV, respectively. The reference standards can be produced by an x-ray tube built into the ITER spectrometer. We present spectra of the reference lines obtained with an x-ray microcalorimeter and compare them to spectra of the W(64+) line obtained both with an x-ray microcalorimeter and a crystal spectrometer.

Atomic data for Ne-like ions useful in plasma diagnostic

“…This is because the CIXS will provide radial profiles of the ion abundances in ITER and therefore reliable atomic data is required for using the CIXS in this endeavor. Further, the transition lines have also been measured for Ne-like Hf [2]. Therefore, to provide support to experimentalists and to extend the database, we have calculated the reliable atomic data in form of energy level, oscillator strength, transition probability and line strength for Ne-like ions (Z=72-75).…”

Relativistic many-body calculations of excitation energies, oscillator strengths, transition rates, and lifetimes in samariumlike ions

“…Tungsten will likely be a constituent of plasmas generated by the ITER (Latin, "the way") tokamak [17], and spectroscopic diagnostics are currently being developed that use radiation from tungsten ions for determining ITER plasma parameters [10,13,18]. An overview of recent results from the Livermore WOLFRAM spectroscopy project was presented recently by Clementson et al [3], which includes experimental investigations at the EBIT-I and SuperEBIT electron beam ion traps.…”

Tungsten Data for Current and Future Uses in Fusion and Plasma Science

“…For example, various survey-type instruments will monitor plasma performance near the plasma edge [7,78], where lower ionization stages of tungsten will radiate. The core plasma will be monitored with the aforementioned CIXS instrument [6] and possibly an X-ray microcalorimeter [79]. Both of these instruments are designed to determine the ion temperature from the L-shell emission of tungsten ions.…”