High density conics in a magnetically expanding helicon plasma

C. Charles

doi:10.1063/1.3309668

High density conics in a magnetically expanding helicon plasma

C. Charles^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

85 Citations (Scopus)

Abstract

A two-dimensional mapping of ion density and plasma potential in a diverging magnetized low pressure (0.4 mTorr) carbon dioxide helicon plasma containing a double layer reveals the presence of high density conics (∼7× 10⁹ cm^-3) along the most diverging magnetic field lines exiting the helicon source and connecting with the grounded expansion chamber. The density in the conic is about 30% greater than the density at the double layer and this results from local ionization associated with the presence of a high energy tail in the electron energy probability function. The plasma potential along the conic is constant at about 30 V.

Original language	English
Article number	051502
Journal	Applied Physics Letters
Volume	96
Issue number	5
DOIs	https://doi.org/10.1063/1.3309668
Publication status	Published - 2010

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abstract = "A two-dimensional mapping of ion density and plasma potential in a diverging magnetized low pressure (0.4 mTorr) carbon dioxide helicon plasma containing a double layer reveals the presence of high density conics (∼7× 109 cm-3) along the most diverging magnetic field lines exiting the helicon source and connecting with the grounded expansion chamber. The density in the conic is about 30% greater than the density at the double layer and this results from local ionization associated with the presence of a high energy tail in the electron energy probability function. The plasma potential along the conic is constant at about 30 V.",

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AB - A two-dimensional mapping of ion density and plasma potential in a diverging magnetized low pressure (0.4 mTorr) carbon dioxide helicon plasma containing a double layer reveals the presence of high density conics (∼7× 109 cm-3) along the most diverging magnetic field lines exiting the helicon source and connecting with the grounded expansion chamber. The density in the conic is about 30% greater than the density at the double layer and this results from local ionization associated with the presence of a high energy tail in the electron energy probability function. The plasma potential along the conic is constant at about 30 V.

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High density conics in a magnetically expanding helicon plasma

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