| Abstract: | A method of obtaining high current density from a small fraction of the total emitting area was developed. This was done by using a low positive DC voltage on the control grid of the TWT in conjunction with a negative (suppressing) voltage on the anode. Current density that was a significant fraction of that for pulsed anode operation was obtained and the grid dissipation was so low that the pulsed operation was avoidable. Underheating (slump) curves taken by varying cathode temperature in this mode were found to correlate well with pulsed anode results, and accurately to predict cathode activity under normal operating conditions. |
