CTIA's Tungsten Heater in Electron Emission Source
CTIA’s tungsten heater is a resistive heating component used in electron emission systems to heat the cathode and enable thermionic electron emission. It is fabricated from high-purity tungsten wire or doped tungsten wire through precision stranding, coiling, forming, and surface treatment processes. As an important heating element in electron guns, the tungsten heater provides a stable thermal field to drive electron emission from the cathode, forming a focused electron beam. It is widely used in Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray tubes, and electron beam processing systems.
Working Principle of Tungsten Heater in Electron Emission Source
The tungsten heater operates based on the thermionic emission principle. When electric current passes through the heater, Joule heating raises the cathode temperature to the emission threshold. Electrons gain sufficient energy to overcome the work function and are emitted from the surface. Under an applied electric field, these electrons are accelerated into a directional beam. Therefore, thermal stability of the heater directly affects beam intensity, focusing performance, and long-term operational stability.
Applications of CTIA’s Tungsten Heater in Electron Emission Systems
Tungsten heater produced by CTIA GROUP finds extensive use in the following precision fields:
(1) SEM Electron Emission Systems: Providing a stable thermionic source to ensure imaging resolution and beam stability.
(2) TEM Electron Source Systems: Supporting high-brightness electron beam generation for nanoscale structural analysis.
(3) X-ray Tubes and Medical Equipment: Facilitating the initial thermionic cathode heating for electron beam acceleration.
(4) Electron Beam Welding and Melting: Generating high-energy electron beams for deep penetration welding and high-purity melting processes.
(5) Vacuum Electronic Devices: Serving as a reliable heat source for vacuum tubes, particle beams, and advanced electron source research.
Specifications of CTIA’s Tungsten Heater
Material: High-purity tungsten wire (≥99.95%) or doped tungsten wire
Wire diameter: 0.1~0.8 mm, customizable
Structure: Single or multi-strand precision twisted
Emission geometry: Straight, coil, and hairpin types for different electron gun designs
Surface treatment: Electrolytic polishing or vacuum degassing to reduce outgassing and improve ultra-high vacuum stability
CTIA GROUP has over 30 years of experience in tungsten heater manufacturing. Based on electron gun structure, cathode type, and operating temperature requirements, CTIA optimizes tungsten wire diameter, structural configuration, emission length, and lead structure. Combined with suitable surface treatment processes, CTIA provides full-process customized solutions from material selection to precision manufacturing.
For any inquiry, please contact tungsten heater manufacturer: CTIA GROUP
Email: sales@chinatungsten.com
Tel: 0086 592 5129696 / 0086 592 5129595
Website: www.tungsten.com.cn
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1.Tungsten heater quotation table
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4. Stranded tungsten wire for making tungsten heater