Title :
The Structure of Carbon Arc at Fullerene Synthesis
Author :
Smyaglikov, Igor P.
Author_Institution :
Inst. of Phys., Nat. Acad. of Sci. of Belarus, Minsk
Abstract :
In this paper, the arc between graphite electrodes under conditions favorable for fullerene synthesis (I = 60-120 A, U = 20-40 V, L = 1-6 mm, p = 1-200 torr) is considered. The time-spatial structure of the arc is studied by means of high-speed imaging. For the first time, it was found out that the arc in question exists in two modes. In the nonstationary mode, the arc looks like two contracted spiral channels coming from an anode spot and revolving on lateral surface of cylindrical electrodes with a frequency of 10-20 kHz. The observed unsteadiness arises from the development of overheating instability of heterogeneous plasma.
Keywords :
arcs (electric); carbon; electrodes; fullerenes; materials preparation; plasma instability; C; anode spot; carbon arc structure; contracted spiral channels; current 60 A to 120 A; cylindrical electrode lateral surface; frequency 10 kHz to 20 kHz; fullerene synthesis; graphite electrodes; heterogeneous plasma instability; high-speed imaging; pressure 1 torr to 200 torr; size 1 mm to 6 mm; time-spatial structure; voltage 20 V to 40 V; Carbon arc; fullerene; nonstationary mode; scan; time-spatial structure;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2008.924626
