INDUSTRY COMPONENT

Input Coupler

Input coupler is a waveguide component that efficiently transfers electromagnetic energy from an external source into an accelerating waveguide system.

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Component Specifications

Definition
An input coupler is a critical microwave component in particle accelerator systems that couples electromagnetic power from an external radio frequency (RF) source into the accelerating waveguide structure. It serves as the interface between the power generation system and the accelerating cavity, ensuring optimal energy transfer with minimal reflection and power loss. The component is designed to match the impedance between the external transmission line and the waveguide, maintaining the required electromagnetic field distribution for particle acceleration.
Working Principle
The input coupler operates on the principle of electromagnetic coupling and impedance matching. It typically uses an antenna or coupling loop that extends into the waveguide cavity, creating an electromagnetic field that excites the desired resonant modes within the accelerating structure. The coupling strength is carefully designed to achieve critical coupling, where the power transferred into the waveguide equals the power dissipated within it, maximizing energy transfer efficiency while minimizing reflected power.
Materials
High-purity oxygen-free copper (C10100/C10200) for RF surfaces, stainless steel (304/316) for structural components, aluminum alloys for non-critical parts, and ceramic (alumina or beryllia) for vacuum windows and insulators.
Technical Parameters
  • VSWR <1.1:1
  • Vacuum Rating <10^-9 Torr
  • Cooling Method Water cooling with deionized water
  • Power Handling Up to 50 MW peak, 500 kW average
  • Coupling Factor 0.8-1.2 (adjustable)
  • Frequency Range 2.856 GHz (S-band) or 5.712 GHz (C-band)
  • Temperature Range -20°C to +80°C
Standards
ISO 9001, ISO 14001, DIN EN 50129, IEC 61312

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Input Coupler.

waveguide input coupler RF coupler accelerator component microwave coupling particle accelerator parts high-power RF components vacuum waveguide coupler Input Coupler Input Coupler in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Accelerating Waveguide

A specialized waveguide component within a medical linear accelerator that guides and accelerates electrons to produce high-energy X-rays for radiation therapy.

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Engineering Analysis

Risks & Mitigation
  • RF arcing at high power levels
  • Vacuum leaks at coupling interfaces
  • Thermal stress from high power dissipation
  • Impedance mismatch causing power reflection
  • Mechanical vibration affecting coupling stability
FMEA Triads
Trigger: Improper vacuum sealing at flange connections
Failure: Vacuum degradation leading to RF breakdown and system shutdown
Mitigation: Implement double O-ring seals with helium leak testing, use copper gaskets for ultra-high vacuum applications
Trigger: Thermal expansion mismatch between materials
Failure: Mechanical stress leading to cracks or vacuum leaks
Mitigation: Use compatible thermal expansion materials, incorporate expansion joints, implement active cooling systems
Trigger: RF multipacting at specific power levels
Failure: Electron multiplication causing vacuum breakdown and power reflection
Mitigation: Design with multipacting suppression features, implement conditioning procedures, use non-magnetic materials

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.05 mm for critical dimensions, ±0.1° for angular alignment, surface roughness Ra < 0.4 μm for RF surfaces
Test Method
Vector network analyzer (VNA) measurements for S-parameters, vacuum leak testing with helium mass spectrometer, high-power RF testing with dummy loads, thermal imaging for heat distribution analysis

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 an input coupler in an accelerating waveguide?

The primary function is to efficiently transfer electromagnetic energy from an external RF source into the accelerating waveguide while maintaining impedance matching and minimizing power reflection.

How is the coupling strength adjusted in input couplers?

Coupling strength is typically adjusted mechanically by changing the penetration depth of the coupling antenna or loop into the waveguide cavity, or electrically using tuning elements like stub tuners or movable shorts.

What materials are commonly used for input coupler construction?

High-purity copper for RF surfaces due to excellent conductivity, stainless steel for structural integrity, and ceramics for vacuum windows and electrical insulation.

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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