THE EXPERIMENTAL STUDY OF ARC CATHODE MICROSPOTS LIFE-TIME BY THE VELOCITY MlCROPHOTOGRAPHY A.A. Pertsev and V.P. Shadov J. Phys. Colloques, 40 C7 (1979) C7-409-C7-410 DOI: 10.1051/jphyscol:19797200