NDLI: Long, stable plasma generation in the ZaP Flow Z-pinch

Content Provider	IEEE Xplore Digital Library
Author	Shumlak, U. Golingo, R.P. Hughes, M.C. Knecht, S.D. Lowrie, W. Murakami, N. Nelson, B.A. Paliwoda, M.C. Ross, M.P.
Copyright Year	2012
Description	Author affiliation: Aerospace and Energetics Research Program, University of Washington, Seattle, 98195-2250 USA (Shumlak, U.; Golingo, R.P.; Hughes, M.C.; Knecht, S.D.; Lowrie, W.; Murakami, N.; Nelson, B.A.; Paliwoda, M.C.; Ross, M.P.)
Abstract	Summary form only given. The ZaP Flow Z-pinch $experiment^{1}$ at the University of Washington investigates the effect of sheared flows on MHD stability. Axially flowing Z-pinch plasmas are produced that are 100 cm long with a 1 cm radius. The plasma remains quiescent for many radial Alfvén times and axial flow times. The quiescent periods are characterized by low magnetic mode activity measured at several locations along the plasma column and by stationary visible plasma emission. Profiles of the plasma's axial flow are measured with a multi-chord ion Doppler spectrometer. A sheared flow profile is observed to be coincident with the quiescent period. The flow profile is well understood and consistent with classical plasma viscosity. Plasma lifetime appears to only be limited by plasma supply and current waveform. Equilibrium is determined by the following diagnostic measurements: interferometry for density; spectroscopy for ion temperature, plasma flow, and $density^{2};$ Thomson scattering for electron temperature; Zeeman splitting for internal magnetic field $measurements^{3};$ and fast framing photography for global structure. A radial heat conduction analysis is performed to calculate equilibrium profiles from the experimental data by assuming Braginskii thermal conductivities and radial force balance. The profiles are corroborated by additional experimental measurements. To confirm the importance of shear flow stabilization, the effect of wall stabilization is investigated by removing large portions of the surrounding conducting wall. The configuration is also computationally modeled to demonstrate no wall effects contributing to observed stability of the Z-pinch plasma.
File Size	99965
File Format	PDF
ISBN	9781457721274
ISSN	07309244
e-ISBN	9781457721298
e-ISBN	9781457721281
DOI	10.1109/PLASMA.2012.6383650
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-08
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasmas Plasma measurements Temperature measurement Fluid flow measurement Stability analysis Thermal stability Current measurement
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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