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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.
46,00 € inkl. MwSt.
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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 %.
42,00 € inkl. MwSt.
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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.
46,00 € inkl. MwSt.
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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.
48,00 € inkl. MwSt.
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Pushing the KIT 2 MW Coaxial-Cavity Short-Pulse Gyrotron Towards a DEMO Relevant Design
Produktform: Buch / Einband - flex.(Paperback)
45,00 € inkl. MwSt.
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lieferbar - Lieferzeit 10-15 Werktage
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.
44,00 € inkl. MwSt.
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lieferbar - Lieferzeit 10-15 Werktage
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.
45,00 € inkl. MwSt.
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lieferbar - Lieferzeit 10-15 Werktage
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.
46,00 € inkl. MwSt.
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lieferbar - Lieferzeit 10-15 Werktage
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.
39,00 € inkl. MwSt.
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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.
49,00 € inkl. MwSt.
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lieferbar - Lieferzeit 10-15 Werktage