Megavolt electrons striking a high-Z anode/bremsstrahlung X-ray converter anode are partially reflected into the anode-cathode gap of the diode. The diode charge density is higher than without reflection, and the current density is lower. A quantitative estimate for one-dimensional flow yields a reduction from Child–Langmuir by up to 25% for unipolar flow. For bipolar flow, the ion current can increase twofold.
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N. R. Pereira (1983) studied this question.
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