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Systematic Study of Key Components for a Coaxial-Cavity Gyrotron for DEMO

Produktform: Buch / Einband - flex.(Paperback)


The physical design of cavity and magnetron injection gun (MIG) for a realistic, DEMO-compatible, coaxial-cavity 238 GHz 2 MW CW fusion gyrotron is developed in this work, having auxiliary frequencies at 170 GHz and 204 GHz. Novel systematic approaches towards multi-frequency mode selection, magnet requirements, and MIG design are presented. Mode deterioration and voltage depression variation due to insert misalignment versus cavity wall and/or versus electron beam are studied.

Verlag: KIT Scientific Publishing, 274 Seiten

Erscheinungsdatum: 11.05.2017

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Design and Experimental Investigation of a Second Harmonic 20 kW Class 28 GHz Gyrotron for Evaluation of New Emitter Technologies

Produktform: Buch / Einband - flex.(Paperback)


Gyrotrons are high-power mm-wave tubes. Here, the design, construction and experimental investigation of a 20 kW, 28 GHz gyrotron (2nd harmonic) are reported. This tube was designed to evaluate new emitters for future highly efficient and reliable fusion gyrotrons and for material processing applications. Following experimental results have been achieved in CW operation: 22.5 kW output power at 23.4 kV electron beam voltage and 2.23 A beam current with the world record efficiency of 43 %.

Verlag: KIT Scientific Publishing, 162 Seiten

Erscheinungsdatum: 16.12.2016

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Influence of Emitter Surface Roughness and Emission Inhomogeneity on Efficiency and Stability of High Power Fusion Gyrotrons

Produktform: Buch / Einband - flex.(Paperback)


The increasing demand for powerful, reliable, and efficient gyrotron oscillators for Electron Cyclotron Resonance Heating (ECRH) in fusion plasma experiments requires a close look at the various factors in gyrotrons that determine gyrotron performance. In this frame, the influence of emitter surface roughness, emission inhomogeneity, and secondary electron generation on gyrotron operation is presented, with focus on Low Frequency Oscillations (LFOs) and Electron Beam Halo (EBH) generation.

Verlag: KIT Scientific Publishing, 224 Seiten

Erscheinungsdatum: 30.11.2016

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Feasibility and Operational Limits for a 236 GHz Hollow-Cavity Gyrotron for DEMO

Produktform: Buch / Einband - flex.(Paperback)


The DEMOnstration fusion power plant (DEMO) will be the first fusion reactor, which is intended to generate net electrical power. For successful operation of DEMO, high-power gyrotrons with operating frequencies up to 240 GHz are required for plasma heating and stabilization. In this work, a systematic feasibility study and tolerance analysis are performed for the conventional-type hollow-cavity DEMO gyrotrons. The various approaches are also suggested to identify its operational limits.

Verlag: KIT Scientific Publishing, 270 Seiten

Erscheinungsdatum: 08.11.2017

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Pushing the KIT 2 MW Coaxial-Cavity Short-Pulse Gyrotron Towards a DEMO Relevant Design

Produktform: Buch / Einband - flex.(Paperback)

Verlag: KIT Scientific Publishing, 190 Seiten

Erscheinungsdatum: 22.01.2021

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A high-voltage pulsed power modulator for fast-rising arbitrary waveforms

Produktform: Buch / Einband - flex.(Paperback)


This work presents the design and testing of a new semiconductor-based pulsed power modulator meeting the challenging requirements of a pulsed electron beam device (GESA): a fast-rising (10^12 V/s) output voltage with arbitrary waveform of maximum 120 kV at a maximum current of 600 A for a pulse duration of up to 100 µs.

Verlag: KIT Scientific Publishing, 198 Seiten

Erscheinungsdatum: 19.02.2020

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Conceptual Studies of Multistage Depressed Collectors for Gyrotrons

Produktform: Buch / Einband - flex.(Paperback)


The multistage depressed collector (MDC) shall be one of the key technologies to achieve the required gyrotron efficiency in the DEMOnstration fusion power plant. For the first time, this work presents a comprehensive study of possible gyrotron MDC concepts. Concepts, only using axisymmetric E- and B-field components are shown to be insufficient. Instead, promising concepts using the E×B drift are proposed. A detailed study of a novel MDC concept using an azimuthal electric field is presented.

Verlag: KIT Scientific Publishing, 232 Seiten

Erscheinungsdatum: 09.09.2019

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Adaptive and Intelligent Temperature Control of Microwave Heating Systems with Multiple Sources

Produktform: Buch / Einband - flex.(Paperback)


In this work, an innovative real-time microwave control approach is proposed, to improve the temperature homogeneity under microwave heating. Multiple adaptive or intelligent control structures have been developed, including the model predictive control, neural network control and reinforcement learning control methods. Experimental results prove that these advanced control methods can effectively reduce the final temperature derivations and improve the temperature homogeneity.

Verlag: KIT Scientific Publishing, 262 Seiten

Erscheinungsdatum: 26.04.2016

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Temperature- and Time-Dependent Dielectric Measurements and Modelling on Curing of Polymer Composites

Produktform: Buch / Einband - flex.(Paperback)


In this book a test set for dielectric measurements at 2.45 GHz during curing of polymer composites is developed. Fast reconstruction is solved using a neural network algorithm. Modeling of the curing process at 2.45 GHz using both dielectric constant and dielectric loss factor results in more accurate model compared to low frequency modelling that only uses the loss factor. Effect of various hardeners and different amount of filler is investigated.

Verlag: KIT Scientific Publishing, 206 Seiten

Erscheinungsdatum: 16.03.2016

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Investigation of Fretting Wear of Cladding Materials in Liquid Lead

Produktform: Buch / Einband - flex.(Paperback)


One promising concept for future nuclear reactors uses liquid metals like Pb as reactor coolant. In this work, fretting of fuel clad materials is investigated in Pb environment at relevant operating conditions. A novel test apparatus is presented that allows fretting tests in liquid lead with high accuracy and reproducibility also during long term tests. Tolerable operating conditions concerning fretting wear by evaluating the specific wear coefficient and the concept of fretting maps are given.

Verlag: KIT Scientific Publishing, 266 Seiten

Erscheinungsdatum: 27.02.2013

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