A thyratron is a type of gas filled tube used as a high power 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 grea.....
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http://en.wikipedia.org/wiki/Thyratron
A gas-filled triode in which the voltage on the grid can trigger ionization of the gas in the tube. Once the gas is ionized, current flows from cathode to anode until the potential across the two falls below a certain level. In Linac the thyratrons are used as high-voltage relays in the chopper power supplies and in the RF modulators to trigger the...
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http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A
An electronic tube containing low pressure gas or metal vapor in which one or more electrodes start current flow to the anode but exercise no further control over its flow. 1
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http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A
gas-filled discharge chamber that contains a cathode filament, an anode plate, and one or more grids. An inert gas or metal vapour fills the ... [3 related articles]
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http://www.britannica.com/eb/a-z/t/47
a hot-cathode grid-controlled arc discharge tube
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=531-35-17
A gas-tube rectifier with a grid electrode that has the ability to initiate current flow when the anode is positive. Once conduction occurs, the grid loses control until the plate current is interrupted.
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https://www.encyclo.co.uk/local/20687
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