In:
Physics of Fluids B: Plasma Physics, AIP Publishing, Vol. 2, No. 6 ( 1990-06-01), p. 1271-1279
Abstract:
The highly indented plasmas of the PBX-M tokamak experiment [Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1989), Vol. 1, p. 97] have reached plasma regimes of both high volume-averaged beta (βt), and high-beta poloidal (βp), and show evidence of the suppression of external surface modes by the passive stabilizing system. Values of βt up to 4.0 I/aB (% MA/m T) with Ti(0)≊4 keV have been obtained. A magnetohydrodynamic analysis of plasmas with βp=2.0 indicates that these plasmas are near the threshold of the second stability regime. A value of βt of 6.8% has been reached with Ti(0) & gt;5 keV and an indentation of 28%. Control of plasma shape is accomplished with a feedback system that uses a moment expansion about a single equilibrium and is augmented by time-dependent waveforms to redefine plasma shape. Diagnostics to measure the safety factor q have been developed and used to make accurate measurements of q(r) and to verify changes made in q(0).
Type of Medium:
Online Resource
ISSN:
0899-8221
Language:
English
Publisher:
AIP Publishing
Publication Date:
1990
detail.hit.zdb_id:
2130787-8
detail.hit.zdb_id:
648023-8
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