| 摘要 |
An improved glow cathode for use as an ion source for cyclotrons is provided wherein the electron-emitting means is formed as a pill or button of a high melting point metal or metal carbide which is supported in a mounting of a highly refractory, substantially infusible material having a high electron work function. Preferably, the electron-emitting button is formed as a cylinder of tungsten and the mounting is formed of graphite. This device can be operated at a gas pressure of approximately 0.2 to 0.5 Torr and a heating voltage of 100 to 200 volts to provide deuterium or hydrogen ions for a cyclotron.
|
