Determination of positive anode sheath in anodic carbon arc for synthesis of nanomaterials

Chopra, N. S.; Raitses, Y.; Yatom, S.; Muñoz Burgos, J. M.

doi:10.1088/1361-6463/ac3bf2

Determination of positive anode sheath in anodic carbon arc for synthesis of nanomaterials

Journal Article · Tue Dec 07 04:00:00 EST 2021 · Journal of Physics. D, Applied Physics

DOI:https://doi.org/10.1088/1361-6463/ac3bf2· OSTI ID:1889109

^[1]; ^[2]; ^[2]; Muñoz Burgos, J. M. ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton University, NJ (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Astro Fusion Spectre LLC, San Diego, CA (United States)

In the atmospheric pressure anodic carbon arc, ablation of the anode serves as a feedstock of carbon for production of nanomaterials. It is known that the ablation of the graphite anode in this arc can have two distinctive modes with low and high ablation rates. The transition between these modes is governed by the power deposition at the arc attachment to the anode and depends on the gap between the anode and the cathode electrodes. Probe measurements combined with optical emission spectroscopy are used to analyze the voltage drop between the arc electrodes. These measurements corroborated previous predictions of a positive anode sheath (i.e. electron attracting sheath) in this arc, which appears in both low and high ablation modes. However, the positive anode sheath was determined to be ~3–8 V, significantly larger than ~0.5 V predicted by previous models. Thus, there are apparently other physical mechanisms not considered by these models that force the anode sheath to be electron attracting in both ablation regimes. Another key result is a relatively low electron temperature (~0.6 eV) obtained from OES using a collisional radiative model. This result partially explains a higher arc voltage (~20 V) required to sustain the arc current of 50–70 A than predicted by existing simulations of this discharge.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1889109

Journal Information:: Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 11 Vol. 55; ISSN 0022-3727

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Determination of positive anode sheath in anodic carbon arc for synthesis of nanomaterials

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