Recent Developments in Linear Theta-pinch Research PDF Download
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Languages : en
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High energy plasmas offusion interest can be generated in linear theta pinches. However, end losses present a fundamental limitation on the plasma containment time. This paper discusses recent progress in end-loss and end-stoppering experiments and in the theoretical understanding of linear theta-pinch physics.
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Languages : en
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High energy plasmas offusion interest can be generated in linear theta pinches. However, end losses present a fundamental limitation on the plasma containment time. This paper discusses recent progress in end-loss and end-stoppering experiments and in the theoretical understanding of linear theta-pinch physics.
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Category : Controlled fusion
Languages : en
Pages : 116
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Languages : en
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At LASL, the experimental results from the high energy (T/sub e/ + T/sub i/ = 3.3 keV, n/sub e/ = 1.5 x 1016 cm−3) 5-m Scylla IV-P theta pinch support the following: (1) single mode m = 1 ''wobble'' instability rotation frequencies of approximately 180 kHz are associated with axial wavelengths of 400 to 800 cm; (2) ion thermal conduction is an unimportant loss mechanism; (3) evidence of rarefaction-like waves is seen; (4) the normalized end-loss time is independent of the plasma beta and collisionality regime; (5) plasma flow from the ends remains collimated and convects magnetic fields; (6) LiD end plugs produce a three-fold increase in energy containment time over the open-ended configuration. Theoretical work at LASL has demonstrated the following: (1) an explanation of the m = 1 ''wobble'' instability has been formulated; (2) a correct description of end-loss must include the magnetic curvature term in the axial momentum equation. Mirrors increase the lifetime of a collisional plasma less than guiding center theory predicts; (3) magnetic field gradient drift can reduce the growth rate of the universal drift instability; (4) collisionless magnetoacoustic heating can be an effective heating mechanism in theta pinches. At MSNW-UW, CO2 laser heating of low energy (T/sub e/ approximately equal to T/sub i/ approximately equal to 2 eV, n/sub e/ approximately equal to 2 x 1017 cm−3) plasmas is accomplished over a one-meter column length. Maintenance of an on-axis density minimum is demonstrated.
Author: Los Alamos National Laboratory
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ISBN:
Category : Research
Languages : en
Pages : 348
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Category : Aeronautics
Languages : en
Pages : 1280
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Category : Power resources
Languages : en
Pages : 872
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Author: United States. Energy Research and Development Administration
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Category : Medicine
Languages : en
Pages : 776
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Author: United States. Energy Research and Development Administration. Technical Information Center
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Category : Force and energy
Languages : en
Pages : 1682
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Category :
Languages : en
Pages :
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Experimental and analytical studies of end loss from a linear theta pinch have been carried out. Analysis of reduced data on loss from a 25 cm long theta pinch has indicated: rotation at the end of pinch collapse, which appears to persist; ejection of the plasma in two modes, the first of which includes reversed, trapped fields; unique patterns of radial and axial variation of electron density in the end loss flow; substantial inaccuracies in plasma properties indicated by spectroscopy as compared to Thomson scattering. Studies of loss in a 50 cm long pinch with 50 eV, 2 x 1016 cm−3 plasma are underway.
Author:
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Category : Controlled fusion
Languages : en
Pages : 702
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