STUDY OF DENSITY AND POTENTIAL FLUCTUATIONS IN THE TEXT TOKAMAK WITH A HEAVY-ION BEAM PROBE

Citation
Jc. Forster et al., STUDY OF DENSITY AND POTENTIAL FLUCTUATIONS IN THE TEXT TOKAMAK WITH A HEAVY-ION BEAM PROBE, IEEE transactions on plasma science, 22(4), 1994, pp. 359-362
Citations number
14
Categorie Soggetti
Phsycs, Fluid & Plasmas
ISSN journal
00933813
Volume
22
Issue
4
Year of publication
1994
Pages
359 - 362
Database
ISI
SICI code
0093-3813(1994)22:4<359:SODAPF>2.0.ZU;2-J
Abstract
A heavy ion beam probe was used to study the characteristics of densit y and potential fluctuations in the TEXT tokamak. Fluctuations of dens ity and space potential are nearly Boltzmann like, (n) over tilde/n si milar to <(phi)over tilde>/kT(e), near the edge of the plasma (0.8 < r /a < 0.9). Potential fluctuations are proportionally greater in the ed ge region (r/a > 0.9). The turbulent E x B radial particle flux is suf ficient to account for all of the particle loss from the tokamak. No p oloidal asymmetries, within a poloidal angle range of about 70 degrees , are observed in the fluctuation levels. The fluctuation spectral sha pe, the density potential phase angle, and the fluctuation propagation speed show a strong radial dependence.