RF Behavior of Cylindrical Cavity Based 240 GHz, 1 MW Gyrotron for Future Tokamak System

Kumar, Nitin; Singh, Udaybir; Bera, Anirban; Sinha, A. K.

doi:10.1007/s10762-017-0419-5

Cited by 16 publications

(8 citation statements)

References 42 publications

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“…This kind of complex interaction is common in cavity resonators: coupling might occur between modes of the feed and the cavity [34], a cavity and a load [35], an electron beam and a cavity [32,36], an airflow and a cavity [8] and many other pairs. No general method will be valid to analyze every case, but a good understanding of the modes and their distribution is a prerequisite for every approach.…”

Section: Understanding Couplingmentioning

confidence: 99%

“…In this sense, we could describe design as the process that takes us from what is theoretically conceivable to what is practically achievable with a resonator. Fortunately, both of the aforementioned examples do actually work and a plethora of simple uses only require straightforward designs, but physicists and engineers are currently tackling extremely difficult technical problems designing resonators in areas like quantum computing [4] and nuclear fusion [5,36].…”

Section: Designing the Resonatormentioning

confidence: 99%

“…Analogous plots for cylindrical cavities, like figure 7, are equally important but much harder to find. They can be generated using supplements C and E. The latter can also be used to illustrate how difficult monomode coupling can be in advanced applications like nuclear fusion [36]: introducing a = 22.6 mm, h = 0 and f = (240 ± 0.5%) GHz yields 1621 and 1586 modes respectively, for a cumbersome total of 35 competing modes within that range.…”

Section: Designing the Resonatormentioning

confidence: 99%

See 2 more Smart Citations

Visualization of cylindrical resonances

Vila

2023

Eur. J. Phys.

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The analysis of cylindrical resonators is part of standard physics curricula but, unlike for their rectangular counterpart, their mode structure is hardly ever visualized. The aim of this work is to show a way of doing it, providing a set of interactive web applications and citing potential use cases in the form of both academic courses and published research. These cover several branches of physics and engineering, showing that these materials can be useful for a broad audience.

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Section: Understanding Couplingmentioning

confidence: 99%

Section: Designing the Resonatormentioning

confidence: 99%

Section: Designing the Resonatormentioning

confidence: 99%

See 1 more Smart Citation

Visualization of cylindrical resonances

Vila

2023

Eur. J. Phys.

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“…Efficient, high power millimetre and terahertz radiation sources are highly sought after for their diverse and farreaching applications in optics, imaging [1][2][3] and security [4], communications [4][5][6] medical technology, particle acceleration [7,8] spectroscopy [9][10][11] and scientific research [12][13][14][15]. Traditionally, sources were scaled according to their output frequency, requiring smaller interaction regions and consequently diminished power capabilities, at shorter wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Mode coupling in periodic surface lattice and metamaterial structures for mm-wave and THz applications

et al. 2019

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Planar periodic surface lattice (PSL) structures based on thin, subwavelength substrates have been studied experimentally and numerically. Coupled eigenmode resonances composed of partial volume and surface modes are observed for PSLs with lattice periodicities of 1.50 mm and 1.62 mm etched onto thin copper-backed, substrates. We show that the copper backing is essential for mode-selection in a multi-moded structure and demonstrate good agreement between the experimental results and coupled dispersion plots calculated using CST Microwave Studio. For the first time, evidence of a coupled eigenmode in a metadielectric PSL is presented. It is shown that metadielectric PSLs can support coupled resonances over a narrow bandwidth and are relevant to the innovation of tunable filters, absorbers and sources. Concepts discussed in this work are valid across the frequency spectrum from optical to THz and mm-wave frequencies and are fundamental to the innovation of novel mm-wave-THz sources as well as highly efficient solar cells, diagnostic instruments and antennae.

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“…All these studies have demonstrated that the presence of helically structured sweat ducts in skin plays a significant role in the interaction of THz wave with human skin and this knowledge will impact on the future directions of THz wave research. Besides this, study on THz wave interaction with human skin is stressed by various works on THz channel characterization in human skin for body-centric nano-communication [20][21][22], for development of extremely high-power gyrotron operating in sub-terahertz frequency region [23][24][25] and high data-rate terahertz communication links [26][27].…”

Section: Introductionmentioning

confidence: 99%

Frequency of the resonance of the human sweat duct in a normal mode of operation

Tripathi

Ishai

Kawase

2018

Biomed. Opt. Express

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The applications of terahertz (THz) waves have been increasing rapidly in different fields such as information and communication technology, homeland security and biomedical engineering. However, study on the possible health implications due to various biological effects induced by THz waves is relatively scarce. Previously, it has been reported that the human sweat ducts play a significant role in the interaction of the THz wave with human skin due to its coiled structure. This structure imposes on them the electromagnetic character of a helical antenna. To further understand these phenomena, we investigated the morphological features of human sweat ducts and the dielectric properties of their surrounding medium. Based upon these parameters, we estimated the frequency of the resonance of the human sweat duct in a normal mode of operation and our estimation showed that there is a broad resonance around 228 GHz. This result indicates that careful consideration should be given while designing electronic and photonic devices operating in the sub-terahertz frequency region in order to avoid various effects on human health due to these waves.

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RF Behavior of Cylindrical Cavity Based 240 GHz, 1 MW Gyrotron for Future Tokamak System

Cited by 16 publications

References 42 publications

Visualization of cylindrical resonances

Visualization of cylindrical resonances

Mode coupling in periodic surface lattice and metamaterial structures for mm-wave and THz applications

Frequency of the resonance of the human sweat duct in a normal mode of operation

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