Satellite spectra of the K. alpha. resonance line of heliumlike nickel, Ni XXVII, from tokamak-fusion-test reactor plasmas: Comparison between theory and experiment

Journal Article · Thu Aug 01 00:00:00 EDT 1991 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.44.1796· OSTI ID:5362882

Bitter, M; Hsuan, H; Decaux, V; Grek, B; Hill, K W; Hulse, R; Kruegel, L A; Johnson, D; von Goeler, S; Zarnstorff, M ^[1]

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1. Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (US)

Satellite spectra of the {ital K}{alpha} line of heliumlike nickel, Ni XXVII, recorded from tokamak-fusion-test reactor (TFTR) Ohmic plasmas with well-defined experimental conditions and central electron temperatures in the range 2--5 keV, have been compared with theoretical predictions. The relevant plasma parameters that determine the spectral features, i.e., the electron and ion temperatures, and the relative abundances of Ni XXV, Ni XXVI, and Ni XXVII have been obtained from least-squares fits of synthetic spectra to the experimental data. Both the dielectronic satellites and the satellites which are produced by collisional inner-shell excitation are well described by the theory given by Bombarda {ital et} {ital al}. (Phys. Rev. A 37, 504 (1988)) and Vainshtein and Safronova (unpublished). The electron-temperature results derived from the fits are in good agreement with electron-temperature measurements from independent diagnostics. However, the values obtained for the relative abundances of Ni XXV, Ni XXVI, and Ni XXVII are larger by factors of 1.3--2 compared to recent coronal-equilibrium predictions of Zastrow, Kaellne, and Summers (Phys. Rev. A 41, 1427 (1990)). Plasma-modeling calculations performed with the multi-ion-species-transport (R. A. Hulse, Nucl. Technol. Fusion 3, 259 (1983)) code show that these deviations can be explained by radial ion transport assuming for the ion-transport diffusion coefficient {ital D} values in the range 1--2.5 m{sup 2} s{sup {minus}1}.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5362882
• Journal Information: Physical Review A. General Physics; (United States), Vol. 44:3; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
NICKEL IONS
X-RAY SPECTRA
TFTR TOKAMAK
ELECTRON TEMPERATURE
ELECTRON-ION COLLISIONS
MULTICHARGED IONS
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ION COLLISIONS
IONS
SPECTRA
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700102* - Fusion Energy- Plasma Research- Diagnostics