Thyratron
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A thyratron is a type of gas filled tube used as a high energy electrical switch and controlled rectifier. A thyratron is basically a "controlled gas rectifier". Triode, tetrode and pentode variations of the thyratron have been manufactured in the past, though most are of the triode design. Because of the gas fill, thyratrons can handle much greater currents than similar hard vacuum valves/tubes since in the ionized gas electron multiplication occurs (each electron leaving the cathode may generate 4 more electrons) by collisions of electrons with gas atoms. The average speed of the ions in the gas is much lower then that of the electrons, so that the ions may only account for 10 % of the total current. Gases used include mercury vapor, xenon, neon, and (in special high-voltage applications or applications requiring very short switching times) hydrogen. Unlike a vacuum tube, a thyratron cannot be used to amplify signals linearly.
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