A thyratron is a type of gas-filled tube used as a high-power electrical switch and controlled rectifier. Because of the gas fill, thyratrons can handle much greater currents than similar hard-vacuum tubes, since electron multiplication occurs in the ionized gas, the phenomenon called Townsend discharge. Gases used include mercury vapor, xenon, neon, and (in special high-voltage applications or applications requiring very short switching times) hydrogen.
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