Accelerating Waveguide for Medical Linear Accelerators

Product Specifications

Technical details and manufacturing context for Accelerating Waveguide

Definition

The accelerating waveguide is a critical component of a medical linear accelerator (LINAC) used in radiation oncology. It functions as an electromagnetic structure that receives microwave energy from a magnetron or klystron and uses this energy to create an accelerating electric field. Electrons injected into the waveguide are accelerated to near the speed of light along its length. These high-energy electrons are then directed onto a target (typically tungsten) to produce the high-energy X-ray beam used for treating cancerous tumors, or are used directly as an electron beam for superficial treatments. The waveguide is typically constructed from oxygen-free high-conductivity copper (OFHC) for the RF structure, with stainless steel for structural components. Key parameters include an operating frequency of 2856 ± 5 MHz (S-band), input power of 2.5–5.0 MW, beam energy of 6–15 MeV, beam current of 0.1–1.0 A, VSWR ≤ 1.2, cooling water flow rate of 10–20 L/min, inlet temperature of 20–30 °C, vacuum pressure ≤ 1e-7 Torr, weight of 15–25 kg, and length of 300–500 mm. These values are reference ranges and must be verified for the specific model and application. The waveguide's precise geometry determines its resonant frequency and phase velocity, which must match the electron velocity for optimal energy transfer. Proper cooling and vacuum are essential to prevent detuning and arcing. This directory entry provides general information; always confirm model-specific specifications and standards with the legal manufacturer or supplier.

Working Principle

The waveguide operates on the principle of traveling-wave or standing-wave acceleration. Microwave power (typically in the S-band, around 3 GHz) is fed into the structure, creating a synchronized longitudinal electric field pattern. Electrons injected in phase with this field 'surf' on the electromagnetic wave, gaining kinetic energy as they travel through the successive cavities of the waveguide. The precise geometry of the cavities determines the resonant frequency and the phase velocity of the wave, which is matched to the velocity of the electrons for optimal energy transfer.

Common Materials

Oxygen-Free High-Conductivity Copper (OFHC), Stainless Steel (for structural components)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Operating Frequency	2856 ± 5 MHz	S-band; must match RF source
Input Power	2.5–5.0 MW	Peak RF power for acceleration
Beam Energy	6–15 MeV	Selectable for treatment depth
Beam Current	0.1–1.0 A	Pulsed current
VSWR	≤ 1.2	Match to RF source
Cooling Water Flow Rate	10–20 L/min	Maintain thermal stability
Cooling Water Inlet Temperature	20–30 °C	Prevent detuning
Vacuum Pressure	≤ 1e-7 Torr	Prevent arcing
Material	OFHC Cu	High conductivityASTM B170
Weight	15–25 kg	Handling and mounting
Length	300–500 mm	Fits linac gantry

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Input Coupler Part
Introduces microwave power from the source (magnetron/klystron) into the waveguide with minimal reflection.

Material: Copper
Accelerating Cavities
A series of resonant cavities that create the longitudinal electric field pattern responsible for electron acceleration.

Material: OFHC Copper
Irises Part
Metal disks with central apertures separating the cavities, which define the resonant frequency and coupling between cavities.

Material: OFHC Copper
Cooling Jacket
A water-cooling channel system surrounding the copper structure to dissipate heat generated by resistive losses (Ohmic heating) from the high-power microwaves.

Material: Stainless Steel
Output Coupler / Beam Exit Port
Allows the accelerated electron beam to exit the waveguide and continue toward the target or beam transport system.

Material: Stainless Steel, Copper

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Frequently Asked Questions

What is the typical operating frequency of an accelerating waveguide?

The operating frequency is typically in the S-band, around 2856 MHz, with a tolerance of ±5 MHz. This must match the RF source (magnetron or klystron) used in the linear accelerator.

What materials are commonly used in the construction of an accelerating waveguide?

The RF structure is typically made of oxygen-free high-conductivity copper (OFHC) to ensure high electrical conductivity, while stainless steel may be used for structural components. Material grades should be verified with the manufacturer.

Why is cooling important for an accelerating waveguide?

Cooling is essential to maintain thermal stability and prevent detuning of the resonant frequency. Typical cooling water flow rates are 10-20 L/min with an inlet temperature of 20-30 °C, but these values must be confirmed for the specific model.

What vacuum pressure is required inside the waveguide?

A vacuum pressure of ≤ 1e-7 Torr is typically required to prevent arcing and ensure stable operation. This is a reference value; the exact requirement may vary and should be verified with the manufacturer.

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pressure:	High vacuum (10^-6 to 10^-9 Torr)
other spec:	Electron energy range: 6-20 MeV, RF frequency: 2.998-3.000 GHz, Vacuum integrity: <10^-9 mbar·L/s leak rate
temperature:	20-40°C (operating), 15-50°C (storage)

Accelerating Waveguide

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