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Abstract

Topical problems involving the interpretation of line emission from impurities or diagnostic test ions in Tokamak fusion devices are discussed briefly. The particular use of Tokamaks for precision (+- 10 ppm) wavelength spectroscopy of DELTAn = 0 transitions in highly ionized atoms with between 2 and 12 electrons is described in more detail. Experimental wavelengths are compared with ab-initio theory and with semiempirical isoelectronic extrapolations. The Tokamak data for ions with Z >= 3-electrons lead to improved isoelectronic extrapolations which reveal errors in the previous data and provide transfer standards of wavelength in the XUV and VUV regions. Wavelengths of the 2-electron systems are of sufficient accuracy to be sensitive to the 2-photon exchange term in the Breit interaction as well as the 2-electron contribution to the Lamb shift. Experimental wavelengths are in agreement with recent theoretical calculations taking these contributions into account.

Additional information

Authors: PEACOCK N J, CULHAM LABORATORY, ABINGDON, OXON (UK);THE CLARENDON LABORATORY, UNIVERSITY OF OXFORD (UK);STAMP M F, CULHAM LABORATORY, ABINGDON, OXON (UK);THE CLARENDON LABORATORY, UNIVERSITY OF OXFORD (UK);SILVER J D CULHAM LABORATORY, ABINGDON, OXON (UK), CULHAM LABORATORY, ABINGDON, OXON (UK);THE CLARENDON LABORATORY, UNIVERSITY OF OXFORD (UK);THE CLARENDON LABORATORY, UNIVERSITY OF OXFORD (UK), CULHAM LABORATORY, ABINGDON, OXON (UK);THE CLARENDON LABORATORY, UNIVERSITY OF OXFORD (UK)
Bibliographic Reference: PHYSICA SCRIPTA, VOL. T8 (1984), PP. 10-20
Record Number: 1989123062500 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en