We present a device to control the rapidly decreasing impedance that has been observed with Applied-B ion diodes. This device, which we call an impedance limiter, is a protrusion at the midplane of the anode. Its purpose is to reduce the electron space charge near the anode emission surface. Electromagnetic particle-in-cell simulations show that the impedance characteristics of an Applied-B diode can be favorably modified by using this device. Preliminary experimental results on the particle beam fusion accelerator I for an Applied-B ion diode using an impedance limiter show promise.
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Slutz et al. (1987) studied this question.
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