Characteristics of Single Cathode Cascaded Bias Voltage Arc Plasma

OU Wei (欧巍); DENG Baiquan (邓柏权); ZENG Xianjun (曾宪俊); GOU Fujun (芶富均); XUE Xiaoyan (薛晓艳); ZHANG Weiwei (张卫卫); CAO Xiaogang (曹小岗); YANG Dangxiao (杨党校); CAO Zhi (曹智)

doi:10.1088/1009-0630/18/6/08

Plasma Science and Technology > 2016 > 18(6): 627-633. > DOI: 10.1088/1009-0630/18/6/08

OU Wei (欧巍), DENG Baiquan (邓柏权), ZENG Xianjun (曾宪俊), GOU Fujun (芶富均), XUE Xiaoyan (薛晓艳), ZHANG Weiwei (张卫卫), CAO Xiaogang (曹小岗), YANG Dangxiao (杨党校), CAO Zhi (曹智). Characteristics of Single Cathode Cascaded Bias Voltage Arc Plasma[J]. Plasma Science and Technology, 2016, 18(6): 627-633. DOI: 10.1088/1009-0630/18/6/08

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Characteristics of Single Cathode Cascaded Bias Voltage Arc Plasma

1Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China 2Southwestern Institute of Physics, Chengdu 610041, China 3HOPE Innovations Inc., Mississauga, Ontario L40A5, Canada

Funds: supported by the International Thermonuclear Experimental Reactor (ITER) Program Special of Ministry of Science and Technology (No. 2013GB114003), and National Natural Science Foundation of China (Nos. 11275135, 11475122)

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Received Date: May 14, 2015

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Abstract

Abstract

A single cathode with a cascaded bias voltage arc plasma source has been developed with a new quartz cathode chamber, instead of the previous copper chambers, to provide better diagnostic observation and access to the plasma optical emission. The cathode chamber cooling scheme is also modi?ed to be naturally cooled only by light emission without cooling water to improve the optical thin performance in the optical path. A single-parameter physical model has been developed to describe the power dissipated in the cascaded bias voltage arc discharge argon plasmas, which have been investigated by utilizing optical emission spectroscopy (OES) and Langmuir probe. In the experiments, discharge currents from 50 A to 100 A, argon flow rates from 800 sccm to 2000 sccm and magnetic fields of 0.1 T and 0.2 T were chosen. The results show: (a) the relationship between the averaged resistivity and the averaged current density exhibits an empirical scaling law as ηˉ∝ˉj-0.63369 and the power dissipated in the arc has a strong relation with the filling factor; (b) through the quartz, the argon ions optical emission lines have been easily observed and are dominating with wavelengths between 340 nm and 520 nm, which are the emissions of Ar+-434.81 nm and Ar+-442.60 nm line, and the intensities are increasing with the arc current and decreasing with the inlet argon flow rate; and (c) the electron density and temperature can reach 2.0 × 1019 m-3 and 0.48 eV, respectively, under the conditions of an arc current of 90 A and a magnetic field of 0.2 T. The half-width of the ne radial profile is approximatively equal to a few Larmor radii of electrons and can be regarded as the diameter of the plasma jet in the experiments.
- plasma source,
- cascaded arc,
- quartz chamber,
- single cathode

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References

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