Measurements of the space potential of electron cyclotron heated plasmas in the Advanced Toroidal Facility

Author

Aceto, S.C. ; Connor, K.A. ; Schwelberger, J.G. ; Zielinski, J.J.

Author_Institution

Rensselaer Polytech. Inst., Troy, NY, USA

Volume

22

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

388

Lastpage

394

Abstract

A heavy ion beam probe has been used to measure the space potential of electron cyclotron heated plasmas in the Advanced Toroidal Facility. The results of the measured potential profiles are presented along with the radial electric field strength profiles derived from these measurements. The measured potential profiles have been compared to those predicted by a simple model of the plasma based upon an ambipolarity constraint on the ion and electron particle fluxes in steady state. The trends of the measured and modeled profiles are in agreement, although the strength of the electric field predicted by the model is much greater than that inferred from the potential profile measurement. When an oxygen-like impurity ion species is added to the model, the predicted electric field strengths are altered significantly and become much closer to the measured values

Keywords

Tokamak devices; electric field measurement; electric potential; ion beam applications; ion beams; plasma probes; plasma toroidal confinement; Advanced Toroidal Facility; O-like impurity ion species; ambipolarity constraint; electric field; electric field strengths; electron cyclotron heated plasmas; potential profile measurement; radial electric field strength profiles; space potential; Cyclotrons; Electric variables measurement; Electron beams; Ion beams; Particle measurements; Plasma measurements; Predictive models; Probes; Space heating; Steady-state;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.310645

Filename

310645