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1

The gyrotron for DNP-NMR spectroscopy: A review

Nowak Kacper

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 1

art. no. e140354

EN

This paper outlines the principle of the DNP-NMR technique. The gyrotron, as a very promising microwave source for NMR spectroscopy, is evaluated. Four factors: power stability, power tuning, frequency stability, and frequency tuning determine the usability of the gyrotron device. The causes of instabilities, as well as the methods of overcoming limitations and extending usability are explained with reference to the theory, the numerical and experimental results reported by gyrotron groups.

2

TEm,1 coaxial modes generator for cold-testing of high power components and devices

Jaworski Grzegorz, Francik Andrzej, Nowak Kacper

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 2

art. no. e140467

EN

In this paper, we describe the development and design procedure of the new kind of coaxial TEm,1 modes generator based on ring resonator with coupling apertures. The generator enables excitation of subsequent TEm,1 modes in a cylindrical waveguide. The proposed design method allows to obtain high purity TEm,1 modes. The angular mode number can be chosen by replacing the plate with coupling apertures. Structure and parameters of the generator was optimized using CST-Microwave Studio. The mode generator was fabricated and checked on the test bench in an anechoic chamber. The measured field distributions confirm excitation of the desired TEm,1 modes. A good agreement between simulations and measurements is obtained. The presented mode generator, operating in non-rotating TEm,1 modes, is easy to fabricate, and suitable for cold-test experiments of high power components and devices.

3

Vlasov Launcher Diagrammatic Design Using the RT Method

Francik Andrzej, Jaworski Grzegorz, Nowak Maciej, Nowak Kacper

Journal of Telecommunications and Information Technology

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2021

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nr 2

57--67

EN

In this paper, a simple and fast method relied upon for designing a Vlasov launcher with a helical cut is proposed. The method is based on graphic interpretation of analytical relationships that link wave parameters (EM field mode) to the launcher’s geometrical dimensions. Using the ray tracing method, a simplified graphic analysis may be carried out. The results obtained are not significantly different from those of rigorous full-wave analyzes. The family of normalized curves that is created in the process greatly facilitates the stage of optimizing the geometrical parameters of the Vlasov launcher.

4

Optimization of Gyrotron Resonator’s Dimensions

Nowak Kacper, Dumbrajs Olgierd

Journal of Telecommunications and Information Technology

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2021

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nr 1

71--76

EN

This paper explains the procedure of determining the initial dimensions of a gyrotron resonator. In particular, the paper discusses which geometrical parameters impact the wave properties of the resonator. The solution is implemented using Matlab software and estimations are performed with the use of the SMath Studio spreadsheet.

5

Review of Experimental Veriﬁcation Methods of Gyrotron Quasi-optical Mode Converters

Jaworski Grzegorz, Francik Andrzej, Nowak Maciej, Nowak Kacper

Journal of Telecommunications and Information Technology

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2020

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nr 3

75--85

EN

This survey presents a review of experimental methods relied upon while implementing gyrotron higher mode generation techniques and performing near electromagnetic ﬁeld measurements in launcher and quasi-optical mode converters. In particular, the paper focuses on low power (cold) testing of gyrotron quasi-optical mode converters outside of the gyrotron, without the presence of high electromagnetic power and electron beams.