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The ionization length in plasmas with finite temperature ion sources
Jelić, Nikola (Author), Kos, Leon (Author), Tskhakaya, David (Author), Duhovnik, Jože (Author)

URLURL - Presentation file, Visit http://lecad.fs.uni-lj.si/~leon/research/ppgplasma/PHPAEN1612123503_1.pdf This link opens in a new window

Abstract
The ionization length is an important quantity which up to now has been precisely determined only in plasmas which assume that the ions are born at rest, i.e., in discharges known as cold ion-source plasmas. Presented here are the results of our calculations of the ionization lengths in plasmas with an arbitrary ion source temperature. Harrison and Thompson (H&T) [Proc. Phys. Soc. 74, 145 (1959)] found the values of this quantity for the cases of several ion strength potential profiles in the well-known Tonks-Langmuir [Phys. Rev. 34, 876 (1929)] discharge, which is characterized by cold ion temperature. This scenario is also known as the singular ion-source discharge. The H&T analytic result covers cases of ion sources proportional to exp() with the normalized plasma potential and =0,1,2 values, which correspond to particular physical scenarios. Many years following H&T's work, Bissell and Johnson (B&J) [Phys. Fluids 30, 779 (1987)] developed a model with the so-called warm ion-source temperature, i.e., regular ion source, under B&J's particular assumption that the ionization strength is proportional to the local electron density. However, it appears that B&J were not interested in determining the ionization length at all. The importance of this quantity to theoretical modeling was recognized by Riemann, who recently answered all the questions of the most advanced up-to-date plasma-sheath boundary theory with cold ions [K.-U. Riemann, Phys. Plasmas 13, 063508 (2006)] but still without the stiff warm ion-source case solution, which is highly resistant to solution via anz available analytic method. The present article is an extension of H&T's results obtained for a single point only withion source temperature Tn=0 to arbitrary finite ion source temperatures. The approach applied in this work is based on the method recently developed by Kos et al.

Language:English
Keywords:fizika plazme, ionizacijska dolžina, ionizacijska frekvenca, plazemski plašč, analitično-numerične metode
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2009
Number of pages:str. 123503-1-123503-9
Numbering:Vol. 16, Iss. 12
UDC:533.9.072
ISSN on article:1070-664X
COBISS.SI-ID:11223323 Link is opened in a new window
Views:547
Downloads:191
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Record is a part of a journal

Title:Physics of plasmas
Shortened title:Phys. plasmas
Publisher:American Institute of Physics
ISSN:1070-664X
COBISS.SI-ID:3385895 This link opens in a new window

Secondary language

Language:Unknown
Keywords:physics of plasmas, ionization length, plasma-sheath boundary

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