期刊
APPLIED PHYSICS LETTERS
卷 96, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3309668
关键词
carbon compounds; helicons; ion density; ionisation; magnetic field effects; plasma density; probability
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 (similar to 7x10(9) 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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