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Paper   IPM / Particles And Accelerator / 14536
School of Particles and Accelerator
  Title:   Singularity and Bohm criterion in hot positive ion species in the electronegative ion sources
1.  Morteza Aslaninejad
2.  Kiomars Yasserian
  Status:   Published
  Journal: Phys. Plasmas
  No.:  053505
  Vol.:  23
  Year:  2016
  Supported by:  IPM
The structure of the discharge for a magnetized electronegative ion source with two species of positive ions is investigated. The thermal motion of hot positive ions and the singularities involved with it are taken into account. By analytical solution of the neutral region, the location of the singular point and also the values of the plasma parameter such as electric potential and ion density at the singular point are obtained. A generalized Bohm criterion is recovered and discussed. In addition, for the non-neutral solution, the numerical method is used. In contrast with cold ion plasma, qualitative changes are observed. The parameter space region within which oscillations in the density and potential can be observed has been scanned and discussed. The space charge behavior in the vicinity of edge of the ion sources has also been discussed in detail

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