Measurements of anode temperature around current zero following interruption of high currents

The present work is devoted to the estimation of anode temperature immediately after current zero following interruption of high current vacuum arc. Thermal radiation of a hot sample was registered using a 4-channels high-speed camera HSFC. Every camera channel was equipped with an interference filter to record radiation at various wavelengths (600, 700, 775, and 825 nm). First of all, calibrations of camera channels have been made. A molybdenum crucible with known spectral emissivity was used as a calibration sample. Experiments were carried out at different amplitudes of the arc current both with and without the axial magnetic field (AMF).