Abstract
Current flow in a gas-filled planar thermionic diode is studied for the case when pd is small, i.e., the diode spacing is small compared with the collision mean free path. The fast primary electrons ionize the gas and the positive space charge partially neutralizes the electron space charge. The diode volt-ampere characteristics are computed and compared with experiments in the regime of small pd that produces a monotonic potential distribution between the cathode and the anode. The minimum value of pd necessary for a nonmonotonic distribution is found.
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