Dynamics of large-scale magnetically rotating arc plasmas

Xia, Weidong; Lincun, Li; Zhao, Yuyang; Ma, Qiang; Du, Benni; Chen, Quan; Cheng, Liang

doi:10.1063/1.2204839

Cited by 45 publications

(42 citation statements)

References 13 publications

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“…A NOVEL LARGE area dispersed arc plasma source [1] has been developed to conveniently produce a large volume of homogeneous plasma in our research. The homogeneity of the argon plasma generated is investigated with time-resolved intensified charge-coupled device (ICCD) imaging with an interferential filter centered at 637 nm.…”

Section: Investigation Of a Novel Large Area Dispersed Arc Plasma Soumentioning

confidence: 99%

Investigation of a Novel Large Area Dispersed Arc Plasma Source With Time-Resolved ICCD Imaging

Zhou

Lincun

Cheng

et al. 2008

IEEE Trans. Plasma Sci.

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Unsaturated time-resolved end-on images of argon arc plasma at 1 atm were captured by an intensified chargecoupled device equipped with a narrowband interference filter to evidence the homogeneity of the arc plasma dispersed by increasing the axial magnetic field. A relatively uniform diffuse current sheet was identified established between the concentric electrodes of our specified experimental geometry.Index Terms-Arc plasma, intensified charge-coupled device (ICCD) imaging, large-area plasma , time-resolved imaging.

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Section: Investigation Of a Novel Large Area Dispersed Arc Plasma Soumentioning

confidence: 99%

Investigation of a Novel Large Area Dispersed Arc Plasma Source With Time-Resolved ICCD Imaging

Zhou

Lincun

Cheng

et al. 2008

IEEE Trans. Plasma Sci.

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“…T HE EVOLUTION of cathodic roots from discrete spots to a diffuse cathode attachment has been observed in our efforts to develop a large-scale dispersed arc plasma source [1] with magnetically rotating arc plasma. Direct photography [1]- [5] is an efficient way to visualize arc root at the electrode surface.…”

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confidence: 98%

“…A complete schematic figure of the apparatus employed in this paper can be seen in [1]; relevant details of which are reproduced in Fig. 1, along with the optical experimental setup.…”

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confidence: 99%

“…Direct photography [1]- [5] is an efficient way to visualize arc root at the electrode surface. The consecutive time-resolved images of the cathode region in an argon arc plasma at 1 atm were presented in this paper to cast a light upon the behavior of arc roots attached to the cathode, as the structure of cathodic roots is of significant interest in studying the performance of bulk arc plasma.…”

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confidence: 99%

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Evolution of Cathodic Arc Roots in a Large-Scale Magnetically Rotating Arc Plasma

Xia

Zhou

Bai

2008

IEEE Trans. Plasma Sci.

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The behavior of cathode arc root is one of the most fundamental phenomena associated with arc discharge. The formation of isolated multiple cathodic roots and the transition from discrete spots to a diffuse cathodic attachment in an argon arc plasma at 1 atm have been observed with short exposure time ICCD imaging in our attempt to generate a uniform large-area plasma, using magnetically rotating arc plasma.Index Terms-Arc plasma, arc roots, ICCD imaging, large-area plasma, time-resolved imaging.T HE EVOLUTION of cathodic roots from discrete spots to a diffuse cathode attachment has been observed in our efforts to develop a large-scale dispersed arc plasma source [1] with magnetically rotating arc plasma. Direct photography [1]-[5] is an efficient way to visualize arc root at the electrode surface. The consecutive time-resolved images of the cathode region in an argon arc plasma at 1 atm were presented in this paper to cast a light upon the behavior of arc roots attached to the cathode, as the structure of cathodic roots is of significant interest in studying the performance of bulk arc plasma.A complete schematic figure of the apparatus employed in this paper can be seen in [1]; relevant details of which are reproduced in Fig. 1, along with the optical experimental setup. The 18-mm-o.d. tubular cathode is oriented along the axis of a 80-mm-i.d. hollow anode. The external coaxial magnetic field produced by solenoidal coils induces a rotation of arc plasma, which formed between the two concentric electrodes. An intensified charge-coupled device (ICCD) camera (exposure time of 1 µs; time interval of 1.11 s) was positioned opposite to the chamber to shoot end-on images of the cathodic attachments on the periphery of the cathode end.The arc roots attached to the cathode can be clearly identified when the cathode is not masked. A sequence of unsaturated time-resolved photographs of the cathode region shown in Fig. 2 is the representation of a general trend of cathodic arc attachment found in the research. The input currents (arc current = solenoidal coil current) were set to 300 A, and the magnetic field is computed to be 2100 G in the region of plasma. Frames one and two in Fig. 2 correspond to the cathodic root configuration during the short-time span after the Fig. 1. Schematic representation of apparatus and optical setup.Fig. 2. Evolution of cathode roots from discrete spots to diffuse existence (arc current = 300 A, and axial magnetic field = 2100 G; counterclockwise rotation).arc strike. There are two distinct bright spots further apart, which coexist at least during the 1-µs exposure time of the camera. The rod at the point of short-time localization of a spot heats up greatly, but the cathode, as a whole (and the spot's neighborhood), remains relatively cold. The work of Li [2] on multiarc roots of cathode with no magnetic field suggests that high temperature on the end-on cathode surface facilitates the formation of multiple cathode arc roots by promoting thermionic emission. Increasing the luminance of the ...

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“…Fig. 2 shows the continuous images of several typical arc configurations obtained from the CCD camera, as the small inflow gas, the anode arc attachment (where it occurs has been schematically shown in [2]), is just slightly further downstream than the cathode top section. In these images, the outer white circle delimits the inner anode surface, and the central black spot indicates that the cathode luminescence is mainly blinded by the mask.…”

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confidence: 99%