Electrostatic fluctuations and transport in the edge of the ISX-B tokamak
Technical Report
·
OSTI ID:6138709
Fluctuations observed from a floating double probe in the Impurity Study Experiment (ISX-B) tokamak are interpreted, using a previously described model, in terms of local density, temperature, and potential fluctuations. Spatial and temporal dependencies are presented for the edge plasma of a neutral beam heated discharge and compared with published results from ohmic heated tokamaks. Fluctuation-induced particle fluxes are evaluated, and the inferred particle confinement times are compared with those estimated from balancing parallel and perpendicular flow and from measured densities and particle sources. This comparison, together with the results from a larger data base, reveals atypical density e-folding lengths in the scrape-off layer. An explanation in terms of connection lengths is suggested. The observed fluctuations can then transfer the estimated total particle flux from the main plasma into and across part of the scrape-off layer. The role these fluctuations play in determining the transport of electron energy is also addressed.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6138709
- Report Number(s):
- ORNL/TM-9305; ON: DE86008464
- Country of Publication:
- United States
- Language:
- English
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