INVESTIGATION OF THE PARAMETERS OF A NONSTATIONARY ARC SPOT 
ON A COPPER CATHODE BY THE THERMOSPECTROSCOPIC METHOD.
II. DYNAMICS OF MOVEMENT OF THE SPOT

D. A. Bublievskii,a, b A. Marotta,a
A. M. Esipchuk,a, b L. I. Sharakhovskii,b 
and E. V. A. Da Silvaa 


UDC 621.387.143.014.31

Indirect data on the features of the dynamics of a cathode 
spot in different erosion regimes have been obtained by investigation 
of the fluctuations of the intensity of radiation from the arc of 
the  = 5218 Å CuI copper spectral line modulated by the rotational 
frequency in a magnetic field. It has been revealed that the velocity 
of the cathode spot in the regime of intense radiation of this line 
in macroerosion is always lower than that in the regime of weak radiation 
in microerosion, whereas the variance of its distribution is, conversely, 
higher. A hypothesis for the relationship between the line-radiation 
intensity and the occurrence of a cathode copper-vapor jet affecting 
the mobility and dynamics of the spot and, in terms of them, the erosion 
has been proposed.

aGleb Wataghin Institute of Physics 
at Campinas State University, Campinas, Brazil (Instituto de Fisica 
"Gleb Wataghin," Universidade Estadual de Campinas, Campinas, Sao Paulo, Brasil); 
email: aruy@ifi.unicamp.br;bA. V. Luikov Heat and Mass Transfer Institute, 
National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 
220072, Belarus; email: leonidsh@tut.by. Translated from Inzhenerno-Fizicheskii 
Zhurnal, Vol. 78, No. 1, pp. 167-170, January-February, 2005. 
Original article submitted February 10, 2003.