Studies of Joshi Effect in Mercury Vapour with ta Triode under Various Modes of Detection Mechanism

摘要

Production of Joshi effect (+-) DELTAi in mercury vapour excited by a transformer discharge in the range 0.48 kV to 1.00 kV, 50 Hz hs been studied with triode 30 coupled resistively with L.T. line using it as anode bend (alpha) and grid leak (beta) detectors. The observations of i_(D,L) are taken in plate as well as grid currents. For the observations in grid currents, at a given applied potential, i_D and -DELTAi are in the order beta > alpha at lower values of the resistance R; at its higher values, they are in the order alpha> beta. The corresponding -%DELTAi is, however, in the order alpha > beta for lower values of R, and in the order beta > alpha for the higher values of R. For the observations in grid current, at a given applied potential, i_D is in the order alpha > beta; the corresponding - DELTAi and -%DELTAi are in the order beta > alpha. Remarkably enough no positive effect + DELTAi has been observed in grid leak detection when the observations are taken in plate current, whereas for higher values of R-for and above 1 megohm, positive effect upto the magnitude of +44% is observed under anode bend detection. For the observations in grid current, grid leak detection gives + 11500%DELTAi at V_m, while in the case of anode bend detection, a slight positive effect only 1% maximum, is given at 0.92 kV and onwards, and at high values of R. The results have been explained on the basis of Joshi theory for the phenomenon (+-) DELTAi.