What is the slow wave structure used in TWT?

The Coupled-cavity TWT uses a slow wave structure of a series of cavities coupled to one another. The resonant cavities are coupled together with a transmission line. The electron beam (shown in Figure 9 as red beam) is velocity modulated by an RF input signal at the first resonant cavity.

What are the different waves possible in TWT?

Therefore, a slow-wave structure is used that causes a reduction in the phase velocity of the RF wave inside the TWT. The slow-wave structures can be of different types like a single helix, double helix, zigzag line, corrugated, coupled-cavity or ring bar type etc.

What is the need of slow wave structure used in design of TWT list out the types of slow wave structure?

Slow wave structures act to reduce the group velocity of a transmission line, or increase its group delay compared to a normal “fast-wave” structure. Slow-wave structures are useful in shrinking electrically-long elements.

What are slow wave structures explain how a helical TWT achieves amplification?

The TWT belongs to a category of “linear beam” tubes, such as the klystron, in which the radio wave is amplified by absorbing power from a beam of electrons as it passes down the tube.

Why slow wave structure is used in TWT mention its characteristics?

In order to reduce the velocity of the wave so that the electrons can get sufficient time to interact with wave, wave is passed through the slow wave-structure and thus the phase velocity of the wave is reduced. Thus a slow wave structure is a non-resonating device used to reduce the phase velocity of the EM wave.

What is the purpose of slow wave structure?

Slow-wave structures, which are used in electron devices, are intended to create conditions when a propagating electromagnetic wave can be most intense for interaction with a moving electron beam.

What is slow wave structure?

Slow-wave structures are wave-guides or transmission lines in which the wave travels with a phase velocity equal to or less than a certain predesignated velocity of wave propagation.

What are the slow wave structures?

What is a slow wave structure give its significance?

How does a TWT amplifier work?

The TWT consists of an electron gun (composed of a cathode, a control or modulating grid, and an accelerator), an RF circuit (delay line), an attenuator and a collector. The velocity of the electron beam, traveling through the helix, induces/adds energy to the RF waves on the helix, thus amplifying the signal.

Where are slow wave structures used?

Which of the following requires a slow wave structure?

Which of the following devices uses a slow wave structure? In a klystron the resonant structure limits the bandwidth. A TWT is a broadband device. Its main components are electron gun (to produce the electron beam) and a structure supporting the slow electromagnetic wave.

What is slow wave system for TWT?

As slow-wave systems for TWT use [1] chain connected resonators. Each of them can be present in the form of a waveguide periodically blocked by the same diaphragms containing cracks of communication and channels for the passage of electrons, so that a CSR.

What is a longitudinal helix slow wave non-resonant guide (TWT)?

A longitudinal helix slow wave non-resonant guide is placed at the centre of the tube that provides a low impedance transmission line for the RF energy within the tube. The TWT is designed with helix delay structure to slow the travelling wave down to or below the speed to the electrons in the beam.

Slow-wave structure is made in the form of multilayer structure having no drift tube and assembled of interconnected thin alternating conducting rings and diaphragms forming a number of coupled resonators.

What is traveling wave tube (TWT)?

The Traveling-wave tube can be used as a medium or high power microwave, amplifier. The TWT, because of its construction and working principle has enormous bandwidths and low noise.