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February 2024
Latest News
Can hydrogen be the transportation fuel in an otherwise nuclear economy?
Let’s face it: The global economy should be powered primarily by nuclear power. And it probably will by the end of this century, with a still-significant assist from renewables and hydro. Once nuclear systems are dominant, the costs come down to where gas is now; and when carbon emissions are reduced to a small portion of their present state, it will become obvious that most other sources are only good in niche settings. I mean, why use small modular reactors to load-follow when they can just produce that power instead of buffering it?
J. E. Rice, J. L. Terry, K. B. Fournier, E. S. Marmar
Fusion Science and Technology | Volume 51 | Number 3 | April 2007 | Pages 451-459
Technical Paper | Alcator C-Mod Tokamak | doi.org/10.13182/FST07-A1432
Articles are hosted by Taylor and Francis Online.
The Rydberg series (1s2 to 1snp) up to n = 14 of helium-like argon (Z = 18) has been observed from Alcator C-Mod plasmas using a high-resolution X-ray spectrometer array. High-n satellites to these lines of the form 1s22s to 1s2snp and 1s22p to 1s2pnp with 3 n 12 have been recorded. X-ray spectra of 2l - nl' transitions with 3 n 18 in molybdenum (Z = 42) and 3 n 12 in krypton (Z = 36) and niobium (Z = 41) from charge states around neon-like have also been measured. Numerous examples of the configuration interaction, which alters the line intensities in some transitions of neon-like ions with nearly degenerate upper levels, have been observed. Accurate wavelengths of all of these transitions (±0.5 mÅ) have been determined by comparison to neighboring reference lines from H- and He-like charge states. Line identifications have been made by comparison to ab initio atomic structure calculations, using a fully relativistic, parametric potential code. Measured line intensities have been compared with collisional radiative modeling that includes the contributions from dielectronic recombination and inner shell excitation rates, with good agreement.