Observations of giant recombination edges on PLT tokamak induced by particle transport

Technical Report · Sat Mar 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/5497274· OSTI ID:5497274

Brau, K; von Goeler, S; Bitter, M; Cowan, R D; Eames, D; Hill, K; Sauthoff, N; Silver, E; Stodiek, W

Characteristic steps in the continum spectrum of high temperature tokamak plasmas associated with recombination radiation from impurity ions were observed. During special argon-seeded discharges on the Princeton Large Torus (PLT) tokamak the x-ray spectrum exhibited large enhancements over the bremsstrahlung continuum beginning with energies of 4.1 keV. This corresponds to the radiative capture of free electrons by hydrogen-like argon into the ground state of helium-like argon. A simple particle diffusion model is proposed, with the Ar XVIII radial profiles evaluated from the size of the recombination edges. For the case of moderate density (< n/sub e/ > approx. 3 x 10/sup 13/ cm/sup -3/) and temperature (T/sub e/(0) approx. 1.5 keV) discharges the outward radial transport velocity is found to be approximately 10 m/sec.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: EY-76-C-02-3073
• OSTI ID: 5497274
• Report Number(s): PPPL-1644
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
ARGON
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
ELEMENTS
IMPURITIES
NONMETALS
PLASMA
PLASMA DRIFT
PLT DEVICES
RADIATIONS
RARE GASES
RECOMBINATION
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS