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|a E 1.99:pppl-3529
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|a E 1.99:pppl-3529
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| 088 |
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|a pppl-3529
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| 245 |
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|a Negative Ion Density Fronts
|h [electronic resource]
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| 260 |
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|a Washington, D.C. :
|b United States. Dept. of Energy. Office of Energy Research ;
|a Oak Ridge, Tenn. :
|b distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
|c 2000.
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| 300 |
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|a 572 Kilobytes pages :
|b digital, PDF file.
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| 336 |
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|a text
|b txt
|2 rdacontent.
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| 337 |
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|a computer
|b c
|2 rdamedia.
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| 338 |
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|a online resource
|b cr
|2 rdacarrier.
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| 500 |
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|a Published through the Information Bridge: DOE Scientific and Technical Information.
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| 500 |
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|a 12/18/2000.
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| 500 |
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|a "pppl-3529"
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| 500 |
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|a Igor Kaganovich.
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| 513 |
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|a Topical;
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| 520 |
3 |
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|a Negative ions tend to stratify in electronegative plasmas with hot electrons (electron temperature Te much larger than ion temperature Ti, Te > Ti ). The boundary separating a plasma containing negative ions, and a plasma, without negative ions, is usually thin, so that the negative ion density falls rapidly to zero-forming a negative ion density front. We review theoretical, experimental and numerical results giving the spatio-temporal evolution of negative ion density fronts during plasma ignition, the steady state, and extinction (afterglow). During plasma ignition, negative ion fronts are the result of the break of smooth plasma density profiles during nonlinear convection. In a steady-state plasma, the fronts are boundary layers with steepening of ion density profiles due to nonlinear convection also. But during plasma extinction, the ion fronts are of a completely different nature. Negative ions diffuse freely in the plasma core (no convection), whereas the negative ion front propagates towards the chamber walls with a nearly constant velocity. The concept of fronts turns out to be very effective in analysis of plasma density profile evolution in strongly non-isothermal plasmas.
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| 536 |
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|b AC02-76CH03073.
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| 650 |
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7 |
|a Convection.
|2 local.
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| 650 |
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7 |
|a Boundary Layers.
|2 local.
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| 650 |
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7 |
|a Ignition.
|2 local.
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| 650 |
|
7 |
|a Plasma Density.
|2 local.
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| 650 |
|
7 |
|a Plasma.
|2 local.
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| 650 |
|
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|a Afterglow.
|2 local.
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| 650 |
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7 |
|a Ion Density.
|2 local.
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| 650 |
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7 |
|a Ion Temperature.
|2 local.
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| 650 |
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7 |
|a Anions.
|2 local.
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| 650 |
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|a Electrons.
|2 local.
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| 650 |
|
7 |
|a Plasma Physics And Fusion Technology.
|2 edbsc.
|
| 710 |
2 |
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|a Princeton University.
|b Plasma Physics Laboratory.
|4 res.
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| 710 |
1 |
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|a United States.
|b Department of Energy.
|b Office of Energy Research.
|4 spn.
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| 710 |
1 |
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information.
|4 dst.
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| 856 |
4 |
0 |
|u http://www.osti.gov/servlets/purl/772280-qudr7n/webviewable/
|z Online Access
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| 907 |
|
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|a .b69853952
|b 03-06-23
|c 03-31-12
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| 998 |
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|a web
|b 03-31-12
|c f
|d m
|e p
|f eng
|g dcu
|h 0
|i 1
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| 956 |
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|a Information bridge
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|s a3b835fd-f53d-580e-a50f-9145cc334477
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| 952 |
f |
f |
|p Can circulate
|a University of Colorado Boulder
|b Online
|c Online
|d Online
|e E 1.99:pppl-3529
|h Superintendent of Documents classification
|i web
|n 1
|
