Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determination of positive anode sheath in anodic carbon arc for
  synthesis of nanomaterials   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 (OES) 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. 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.

11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc