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In vacuum tubes and gas-filled tubes, a hot cathode or thermionic cathode is a cathode electrode which is heated to make it emit electrons due to thermionic emission. This is in contrast to a cold cathode, which does not have a heating element. The heating element is usually an electrical filament heated by a separate electric current passing through it. Hot cathodes typically achieve much higher power density than cold cathodes, emitting significantly more electrons from the same surface area. Cold cathodes rely on field electron emission or secondary electron emission from positive ion bombardment, and do not require heating. There are two types of hot cathode. In a directly heated cathode, the filament is the cathode and emits the electrons. In an indirectly heated cathode, the filament

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  • Glühkathode
  • Hot cathode
  • Cathode chaude
  • Termokatoda
  • Cátodo quente
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  • Eine Glühkathode ist eine beheizte Kathode (negativ geladene Elektrode) in Elektronenröhren und teilweise auch in Gasentladungsröhren. Sie funktioniert nach dem Prinzip des Edison-Richardson-Effektes und liefert freie Elektronen. Sie wird häufig als Filament (englisch für Glühfaden), bezeichnet. Merkmale sind die Austrittsarbeit der verwendeten Materialien sowie die Lebensdauer und das Verhalten bei verschiedenen Stromdichten.
  • Termokatoda – katoda wysyłająca elektrony pod wpływem temperatury. Termokatoda podłączana jest do ujemnego bieguna napięcia zasilającego i stanowi ważny element wielu lamp elektronowych.
  • In vacuum tubes and gas-filled tubes, a hot cathode or thermionic cathode is a cathode electrode which is heated to make it emit electrons due to thermionic emission. This is in contrast to a cold cathode, which does not have a heating element. The heating element is usually an electrical filament heated by a separate electric current passing through it. Hot cathodes typically achieve much higher power density than cold cathodes, emitting significantly more electrons from the same surface area. Cold cathodes rely on field electron emission or secondary electron emission from positive ion bombardment, and do not require heating. There are two types of hot cathode. In a directly heated cathode, the filament is the cathode and emits the electrons. In an indirectly heated cathode, the filament
  • Dans les tubes à vide et les tubes à gaz, une cathode chaudeou cathode thermoionique est une électrode chauffée afin d'émettre des électrons par émission thermoionique. Elle s'oppose à la cathode froide, qui ne possède pas d'élément chauffant, et qui reposent sur une émission par effet de champ ou une émission d'électrons secondaires issue d'un bombardement par des ions positifs.
  • Em válvulas termiônicas (popularmente "tubos de vácuo"), um cátodo quente é um eletrodo cátodo que emite elétrons devido a emissão termiônica também conhecida como Efeito Edison. No meio do conhecimento sobre aceleradores, são tratados como cátodos termiônicos. (Cf. , onde a emissão de elétrons por campo é usada e na qual não se requer aquecimento.) O elemento de aquecimento é normalmente um . Cátodos quentes tipicamente adquirem densidade de potência muito mais alta que cátodos frios, emitindo significativamente mais elétrons pela mesma área de superfície.
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