scholarly journals The specifics of quasi-optical measurements in the submillimetre waveband

2021 ◽  
pp. 21-27
Author(s):  
G. V. Kozlov ◽  
S. P. Lebedev
Keyword(s):  
Electromagnetic Field ◽  
Optical Waveguide ◽  
Standing Wave ◽  
Wave Structure ◽  
Dielectric Measurement ◽  
Optical Measurements ◽  
Measurement Results

The paper investigates the influence of the electromagnetic field and standing wave structure in a quasi-optical waveguide on the dielectric measurement results and gives recommendations on the layout of measuring circuits.

Usefulness of Foundry Tooling Materials in Microwave Heating Process

2013 ◽  
Vol 58 (3) ◽  
pp. 919-922 ◽  
Author(s):  
K. Granat ◽  
B. Opyd ◽  
D. Nowak ◽  
M. Stachowicz ◽  
G. Jaworski
Keyword(s):  
Electromagnetic Field ◽  
Microwave Heating ◽  
Loss Factor ◽  
Perturbation Technique ◽  
Resonant Cavity ◽  
Precise Determination ◽  
Heating Process ◽  
Basic Criterion ◽  
Measurement Results ◽  
Heating Technology

Abstract The paper describes preliminary examinations on establishing usefulness criteria of foundry tooling materials in the microwave heating technology. Presented are measurement results of permittivity and loss tangent that determine behaviour of the materials in electromagnetic field. The measurements were carried-out in a waveguide resonant cavity that permits precise determination the above-mentioned parameters by perturbation technique. Examined were five different materials designed for use in foundry tooling. Determined was the loss factor that permits evaluating usefulness of materials in microwave heating technology. It was demonstrated that the selected plastics meet the basic criterion that is transparency for electromagnetic radiation.

Electromagnetic Field Properties of Axial Modes in a Finite Length X-Band Slow Wave Structure

1996 ◽  
Vol 65 (2) ◽  
pp. 627-634 ◽  
Author(s):  
Md. Ruhul Amin ◽  
Kazuo Ogura ◽  
Tadashi Kobayashi ◽  
Yasunobu Suzuki ◽  
Tsuguhiro Watanabe
Keyword(s):  
Electromagnetic Field ◽  
Finite Length ◽  
Slow Wave ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
X Band

scholarly journals NPVO Refractometer for diffusing substance investigations

2017 ◽  
Vol 2 (5) ◽  
pp. 44-48 ◽  
Author(s):  
Мария Якимова ◽  
Mariya Yakimova ◽  
Валентин Алехнович ◽  
Valentin Alekhnovich ◽  
Александр Григорьянц ◽  
...  
Keyword(s):  
Standing Wave ◽  
Measurement Results ◽  
Improve Accuracy

The paper deals with the use of refractometry for the analysis of strongly scattering materials. The peculiarities in the interpretation of measurement results, and in particular, the simulation of attenuation factors of a flat and damped wave for the use in the equation of coupling are considered. Besides, there is investigated a degree of the influence of different parameters (concentration of particles and their parameters) upon results of experiments which will improve accuracy and reliability of experiments. The results of experiments are obtained with the aid of NPVO refractometer on strongly scattering samples with a calibrated composition. The processing of experiment results carried out with the use of Mi scattering factors and scattering factors of standing wave allows estimating in what cases it makes sense to use more complex expressions for a damped wave and in what cases may be used Mi factors.

scholarly journals Development of a novel approach for construction of high gradient braze-free S-band cavities

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mahdi Aghayan ◽  
S. Farhad Masoudi ◽  
Farshad Ghasemi ◽  
Walter Wuensch ◽  
Hamed Shaker
Keyword(s):  
High Temperature ◽  
Radio Frequency ◽  
Standing Wave ◽  
Wave Structure ◽  
Linear Accelerators ◽  
High Gradient ◽  
Novel Approach ◽  
Shrink Fit ◽  
Temperature Heating ◽  
High Temperature Heating

AbstractVacuum breakdown is one of the main limitations to the operating accelerating gradient in radio frequency linear accelerators. Recent studies of copper cavities have been shown that harder copper conditions more quickly and can reach higher accelerating gradients than soft copper cavities. Exploiting this advantage requires the development of assembly methods that do not involve the copper-softening high-temperature heating cycles that are used in for example bonding and brazing. A shrink-fit method, which was already implemented successfully in the operation the IPM linac, is proposed for the construction high-gradient test S-band standing wave structure operating at 2998.5 MHz. The three cells cavity is designed to have a maximum gradient in the middle cell that is twice that of the adjacent cells. Mechanical considerations relating to the shrink-fit construction method have been performed using Ansys. To validate the simulations and ensure the feasibility of construction by shrink-fit method, a sample cavity was constructed and cold tests was performed.

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