Experimental study for the optimization of plasma torch operations R. Benocci, R. Florio, A. Galassi, M. Paolicchio, M. Piselli, C. Sala, M. Sciascia and E. Sindoni Eur. Phys. J. D, 6 2 (1999) 269-279 Published online: 15 May 1999 DOI: 10.1007/s100530050308