A cathode is the electron-emitting electrode in an electron gun, essential for generating electron beams in vacuum tube devices.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Lifetime | 1000-10000 hours | |
| Work Function | 2.0-4.5 eV | |
| Emission Current | 0.1-1000 mA | |
| Vacuum Requirement | <10^-6 mbar | |
| Operating Temperature | 1500-2800 K (thermionic) |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
A device that generates, accelerates, and focuses a beam of electrons for medical radiation therapy applications.
An X-ray source tube is the core component within a Fish Bone Detection Sensor Module that produces controlled X-ray radiation.
An electrical energy storage device that can be recharged and discharged multiple times, used to store solar energy in outdoor solar bollards.
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Thermionic cathodes require heating to emit electrons, offering stable high currents but limited lifespan. Field emission cathodes use strong electric fields for cold emission, providing higher brightness and longer life but requiring ultra-high vacuum.
Material determines work function, emission efficiency, and operational stability. Low work function materials like LaB6 reduce energy consumption, while refractory metals like tungsten withstand higher temperatures but require more power.
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