Observation of neoclassical-like impurity transport in the q less than or equal to 1 region of the PBX tokamak
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 Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6088326
- Report Number(s):
- PPPL-2313; ON: DE86007534
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
Similar Records
Observations of centrally peaked impurity profiles following pellet injection in the Alcator-C-italic tokamak
Observation of impurity accumulation and concurrent impurity influx in PBX
Related Subjects
IMPURITIES
CHARGED-PARTICLE TRANSPORT
PBX DEVICES
BREMSSTRAHLUNG
NEUTRAL ATOM BEAM INJECTION
PLASMA DIAGNOSTICS
BEAM INJECTION
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
RADIATION TRANSPORT
RADIATIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics