Title :
Dynamics of vacuum arc spots at a point cathode
Author :
Jüttner, Burkhard ; Djakov, Boyan ; Schülke, Thomas ; Siemroth, P.
Author_Institution :
Sektion Phys., Humboldt-Univ., Berlin, Germany
Abstract :
The dynamics of cathode spots at a point cathode of 0.3 mm diameter in clean vacuum have been studied by a fast streak camera (HAMAMATSU) in tandem with a fast framing camera (HSFC). The cathode material was titanium, the current amounted to 70-150 A, the time range was 5 ns-10 μs. Well pronounced dynamics has been found in the nanosecond range, yielding one-dimensional spot velocities up to 500 m/s with an exponential shape of frequency distribution. These rapid processes are intersected by fluctuations of the spot brightness, associated with more stationary phases lasting 0.2-1 μs. Thus, the spot dynamics is more complicated than a statistically independent random walk
Keywords :
cathodes; high-speed optical techniques; streak cameras; streak photography; titanium; vacuum arcs; 0.3 mm; 5 ns to 10 mus; 500 m/s; 70 to 150 A; HAMAMATSU; Ti; fast framing camera; fast streak camera; frequency distribution; one-dimensional spot velocities; point cathode; spot brightness fluctuations; stationary phases; titanium cathode; vacuum arc spots dynamics; Anodes; Breakdown voltage; Brightness; Cameras; Capacitors; Cathodes; Electrodes; Fluctuations; Spatial resolution; Vacuum arcs;
Conference_Titel :
Discharges and Electrical Insulation in Vacuum, 1996. Proceedings. ISDEIV., XVIIth International Symposium on
Conference_Location :
Berkeley, CA
Print_ISBN :
0-7803-2906-6
DOI :
10.1109/DEIV.1996.545333
