Special Issue "Atomic and Molecular Spectra in Magnetically Confined Torus Plasmas"
A special issue of Atoms (ISSN 2218-2004).
Deadline for manuscript submissions: 30 June 2021.
Interests: highly charged ions; spectroscopy; heavy ions; helical devices; atomic database; collisional radiative modeling
A variety of atomic and molecular processes occur in magnetically confined torus plasmas for fusion research, such as tokamaks and helical devices, because of their unique plasma characteristics. Even though spectroscopic studies on hydrogen (and its isotopes) atoms and molecules are well developed, it is still a hot topic, relevant to the presence of fast particles, complex fundamental processes, and strong magnetic fields. Intrinsic/extrinsic impurities with various atomic numbers exist in fusion plasmas. Intrinsic impurities arising from plasma–wall interactions include beryllium, carbon, iron, molybdenum, and heavier elements. Emission spectra of heavy ions have recently attracted considerable attention since tungsten has been adopted as a divertor material in the ITER tokamak. A variety of extrinsic impurities are often injected into fusion plasmas with pellet or gas puffing for the purpose of impurity transport study or divertor heat load mitigation. In addition, fusion plasmas can be exploited for spectroscopic studies relevant not only to fusion but also to astrophysics, plasma applications, and basic atomic physics, thanks to the availability of state-of-the-art diagnostic tools.
The scope of this Special Issue is recent experimental and theoretical advances in relation to atomic and molecular spectra in magnetically confined torus plasmas. As mentioned above, the capability of fusion plasmas allows us to investigate a number of elements, from hydrogen to heavy elements, which entirely covers the periodic table. As the electron temperature ranges from a few eV (edge) to 10 keV (core) in fusion plasmas, a wide range of charge states, from neutral to hydrogen-like ions, must be investigated. These investigations are associated with different spectroscopic techniques optimized for specific photon energies. Furthermore, prediction/validation of experimental spectra using collisional radiative modeling and other basic experiments such as EBITs is also of great interest. Spectral line shapes including shifts, widths and splittings are important as powerful diagnostic tools in fusion plasmas. Review papers relevant to the above topics are also in the scope of this Special Issue.
Dr. Chihiro Suzuki
Dr. Izumi Murakami
Manuscript Submission Information
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- magnetically confined fusion
- helical devices
- highly charged ions
- heavy ions
- neutral atoms and molecules
- spectral line shapes
- atomic and molecular processes
- atomic database
- collisional radiative modeling