Observation of neoclassical-like impurity transport in the q less than or equal to 1 region of the PBX tokamak

Technical Report · Sat Feb 01 00:00:00 EST 1986

DOI:https://doi.org/10.2172/6088326· OSTI ID:6088326

Ida, K; Fonck, R J; Sesnic, S; Hulse, R A; LeBlanc, B

Charge-dependent convective impurity transport is observed in the central core of PBX H-mode discharges by measuring radial profiles for both low- and high-Z intrinsic impurities in the presence of strong sawtooth activity. Transport coefficients are derived by simulating the data with a diffusive/convective transport model which includes an internal disruption model. The time evolving Z/sub eff/ profile and central metallic densities are fitted during the quiescent phase between internal disruptions to yield a diffusion coefficient of D = 1 x 10/sup 3/ cm/sup 2//s for all species and an inward convective speed of v = 2.2 x 10/sup 2/ (r/a) cm/s for oxygen and carbon and v = 1.1 x 10/sup 3/ (r/a) cm/s for metals. These transport coefficients are in quantitative agreement with simple cylindrical neoclassical estimates for the region within q less than or equal to 1. 17 refs., 4 figs.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6088326
• Report Number(s): PPPL-2313; ON: DE86007534
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BEAM INJECTION
BREMSSTRAHLUNG
CHARGED-PARTICLE TRANSPORT
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
IMPURITIES
NEUTRAL ATOM BEAM INJECTION
PBX DEVICES
PLASMA DIAGNOSTICS
RADIATION TRANSPORT
RADIATIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES