Abstract Details

icc06_shumlak.pdf2006-02-21 19:38:21U. Shumlak

Equilibrium Evolution in the ZaP Flow Z-Pinch

Author: U. Shumlak
Submitted: 2005-12-21 11:45:51

Co-authors: B.A.Nelson, C.S.Adams, R.P.Golingo, S.L.Jackson, S.D.Knecht, J.Pasko, D.T.Schmuland, D.J.Den Hartog

Contact Info:
University of Washington
120 AERB, Box 352250
Seattle, WA   98195-2

Abstract Text:
The ZaP Flow Z-Pinch Experiment at the University of Washington investigates sheared flow stabilization in an otherwise unstable configuration. An axially flowing Z-pinch is generated with a coaxial accelerator coupled to a pinch assembly chamber. Magnetic probes measure the fluctuation levels of the azimuthal modes m = 1, 2, and 3. The plasma is magnetically confined for an extended quiescent period where the mode activity is significantly reduced. Multichord Doppler shift measurements of impurity lines show a large, but sub-Alfvenic, sheared flow during the quiescent period and low shear profiles during periods of high mode activity. The plasma has a sheared axial flow that exceeds the theoretical threshold for stability during the quiescent period and is lower than the threshold during periods of high mode activity. Multichord interferometer measures a Z-pinch plasma with a peaked radial profile during the quiescent period. Internal magnetic fields have been recently determined by measuring the Zeeman splitting of impurity carbon emission. The measurements are consistent with a well-confined pinch plasma. Recent experimental measurements will be presented. A Thomson scattering diagnostic has been designed and is currently being developed. The diagnostic design and calculations of predicted scattered and background signals will be presented.

Characterization: A2


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