thyratron

/thuy"reuh tron'/, n. Electronics.
a gas-filled, hot-cathode tube in which one or more control electrodes initiate, but do not limit and cannot interrupt, the flow of electrons.
[1925-30; < Gk thýra DOOR + -TRON]

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      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 discharge chamber. The grid controls only the starting of a current and thus provides a trigger effect. The normal grid potential is negative with respect to the cathode and prevents electrons from flowing to the plate and exciting a discharge. To cause a discharge, the grid potential is raised enough to start electrons flowing from the cathode. As free electrons stream toward the plate, they collide with gas molecules, freeing other electrons and ionizing the gas within the discharge chamber. When a sufficient number of ions and electrons are present, a “short” occurs, and a large current flows from the cathode to the plate, causing a discharge. The discharge can take place in a few hundred-millionths of a second. The discharge stops when the anode voltage has been sufficiently lowered. Thyratron tubes are used typically in radar pulse modulators, particle accelerators (particle accelerator), lasers (laser), and high-voltage medical equipment.

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Universalium. 2010.

Look at other dictionaries:

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  • Thyratron — Thy|ra|tron auch: Thy|rat|ron 〈n.; s, tro|ne〉 Elektronenröhre zur Erzeugung von Kippschwingungen [zu grch. thyra „Tür“] * * * Thyratron   [Kurzbildung zu griechisch thýra »Tür« und Elektron] das, s/... trone und s, durch Gitter steuerbare… …   Universal-Lexikon

  • thyratron — noun Etymology: from Thyratron, a trademark Date: 1929 a gas filled hot cathode electron tube in which the grid controls only the start of a continuous current thus giving the tube a trigger effect …   New Collegiate Dictionary

  • thyratron — ˈthīrə.ˌträn noun ( s) Etymology: from Thyratron, a trademark : a gas filled 3 element hot cathode tube in which the grid controls only the start of a continuous current thus giving the tube a trigger effect …   Useful english dictionary

  • thyratron — noun Any of several types of thermoelectric valve once used as a high speed switch …   Wiktionary

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