The wire array z-pinch is an efficient x-ray source  which has been proposed for use in indirect drive inertial confinement fusion schemes . The z-pinch can become a more efficient x-ray source if its stability is improved. Cylindrical wire array z-pinch experiments where the Rayleigh-Taylor instability was suppressed showed increased x-ray yield and power ; however the pressure driven MHD instabilities (sausage and kink instabilities) were still present and possibly limited the x-ray production of the pinch. Linear MHD calculations of z-pinch stability with an axial velocity shear predict that a supersonic axial flow with a radial gradient is capable of stabilizing the MHD instabilities . A sheared flow can be introduced to a pinch by using a conical wire array with a fine metallic wire on axis . The wire on axis will carry a fraction of the total current during the implosion which will cause the center wire to create a conducting plasma column while a flow passes over it. This presentation will compare the experimental results of a z-pinch with and without a sheared flow. From this comparison it will be shown that the sheared flow in these experiments has a stabilizing effect on the MHD instabilities present in the z-pinch plasma column.
|Commitee:||Darling, Timothy W., Ivanov, Vladimir V., LeBlanc, Normand, Leitner, David M., Mancini, Roberto C.|
|School:||University of Nevada, Reno|
|School Location:||United States -- Nevada|
|Source:||DAI-B 72/12, Dissertation Abstracts International|
|Subjects:||Physics, Nuclear physics|
|Keywords:||Conical wire arrays, Jets, Sheared flow, X-ray source, Z-pinch|
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