INDUSTRY COMPONENT

Anode (Extraction Electrode)

Anode (Extraction Electrode) is a critical component in electron guns that extracts and accelerates electrons from the cathode toward the target.

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Component Specifications

Definition
The Anode (Extraction Electrode) is a positively charged electrode in electron gun systems that creates an electric field to extract electrons emitted from the cathode. It functions as the first acceleration stage, pulling electrons into the vacuum chamber and initiating their trajectory toward subsequent focusing and deflection components. This electrode typically operates at high positive voltages (ranging from 1kV to 30kV depending on application) and must maintain precise geometric alignment to ensure proper electron beam formation.
Working Principle
The anode operates on electrostatic principles: when a high positive voltage is applied relative to the cathode, it creates a strong electric field that overcomes the work function of the cathode material, extracting electrons via field emission or thermionic emission. The extracted electrons are then accelerated toward the anode aperture, passing through it to enter the main acceleration region of the electron gun.
Materials
High-purity molybdenum (Mo), tungsten (W), or copper (Cu) with oxygen-free high conductivity (OFHC) properties; sometimes coated with refractory materials like tantalum (Ta) or graphite for enhanced thermal stability and reduced secondary electron emission.
Technical Parameters
  • Surface Finish Ra ≤ 0.4 μm
  • Voltage Rating 1-30 kV
  • Current Capacity 0.1-100 mA
  • Aperture Diameter 0.5-5.0 mm
  • Vacuum Compatibility ≤ 10^-6 Torr
  • Operating Temperature Up to 1500°C
Standards
ISO 14644-1, DIN 25424, ASTM E1256

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Anode (Extraction Electrode).

anode extraction electrode electron gun component electron beam extraction high-voltage electrode vacuum electronics electron emission Anode (Extraction Electrode) Anode (Extraction Electrode) in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Electron Gun

A device that generates, accelerates, and focuses a beam of electrons for medical radiation therapy applications.

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Engineering Analysis

Risks & Mitigation
  • Electrical arcing due to contamination
  • Thermal deformation at high currents
  • Secondary electron emission causing beam instability
  • Material degradation from electron bombardment
FMEA Triads
Trigger: Surface contamination from hydrocarbons or particulates
Failure: Electrical breakdown and arcing between electrodes
Mitigation: Implement strict cleanroom assembly procedures and regular high-vacuum baking
Trigger: Excessive electron beam current density
Failure: Localized overheating and material deformation
Mitigation: Incorporate active cooling systems and current limiting circuits
Trigger: Improper alignment with cathode
Failure: Asymmetric electron extraction and beam deflection
Mitigation: Use precision alignment fixtures and laser alignment verification

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.01 mm for aperture diameter, ±0.05 mm for positional alignment
Test Method
High-voltage breakdown testing per ASTM D149, electron beam profiling using Faraday cups, thermal cycling under operating vacuum

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of the anode in an electron gun?

The anode serves as the extraction electrode that creates the electric field needed to pull electrons from the cathode and initiate their acceleration toward the target.

Why are refractory metals commonly used for anode construction?

Refractory metals like molybdenum and tungsten offer high melting points, excellent thermal stability, and low vapor pressure under high vacuum conditions, making them ideal for high-temperature electron emission environments.

How does anode geometry affect electron beam quality?

The aperture size, shape, and positioning relative to the cathode directly influence beam focus, current density, and trajectory stability. Precise machining and alignment are critical for optimal performance.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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