Conceptual Studies of Multistage Depressed Collectors for Gyrotrons
Title | Conceptual Studies of Multistage Depressed Collectors for Gyrotrons PDF eBook |
Author | Wu, Chuanren |
Publisher | KIT Scientific Publishing |
Pages | 232 |
Release | 2019-09-09 |
Genre | Technology & Engineering |
ISBN | 3731509342 |
A First 2 MW-Class (136)/170/204 GHz Multi-Frequency Gyrotron Pre-Prototype for DEMO: Design, Construction and Key Components Verification
Title | A First 2 MW-Class (136)/170/204 GHz Multi-Frequency Gyrotron Pre-Prototype for DEMO: Design, Construction and Key Components Verification PDF eBook |
Author | Ruess, Tobias |
Publisher | KIT Scientific Publishing |
Pages | 258 |
Release | 2023-10-26 |
Genre | |
ISBN | 3731513099 |
Ein Gyrotron wird in magnetisch eingeschlossenen Plasmaexperimenten für Heizung, Stromtrieb, Plasmastabilisierung und Plasmadiagnostik verwendet. In dieser Arbeit wird der erste Entwurf und Bau eines Mehrfrequenz-/Mehrzweck Pre-Prototyp Gyrotrons in koaxialer Technologie vorgestellt, das bei (136)/170/204 GHz mit einer Ausgangsleistung von 2 MW arbeitet. Dies ist der erste Schritt zum Betrieb bei Frequenzen bis zu 240 GHz unter Verwendung der Koaxialhohlraum-Gyrotrontechnologie. - A gyrotron is used in magnetically confined plasma experiments for heating, current drive, plasma stabilization and plasma diagnostics. This work presents the first design and construction of a multi-frequency / multi-purpose coaxial-cavity pre-prototype gyrotron operating at (136)/170/204 GHz with an output power of 2 MW. It is the first step towards operating frequencies up to 240 GHz using the coaxial-cavity gyrotron technology.
Automated Mode Recovery and Electronic Stability Control for Wendelstein 7-X Gyrotrons
Title | Automated Mode Recovery and Electronic Stability Control for Wendelstein 7-X Gyrotrons PDF eBook |
Author | Wilde, Fabian |
Publisher | KIT Scientific Publishing |
Pages | 272 |
Release | 2024-08-07 |
Genre | |
ISBN | 3731511606 |
Magnetic confinement fusion relies on plasma heating and plasma control using gyrotron oscillators providing at megawatt power levels. The operational reliability decreases when operating at the performance limits due to increasing parasitic mode activity. This work demonstrates for the first time the automated, fast recovery of nominal gyrotron operation during a pulse by exploiting the hysteretic gyrotron behaviour after a mode switch being in use at the Wendelstein 7-X ECRH facility.
Pushing the KIT 2 MW Coaxial-Cavity Short-Pulse Gyrotron Towards a DEMO Relevant Design
Title | Pushing the KIT 2 MW Coaxial-Cavity Short-Pulse Gyrotron Towards a DEMO Relevant Design PDF eBook |
Author | Ruess, Sebastian |
Publisher | KIT Scientific Publishing |
Pages | 190 |
Release | 2021-01-22 |
Genre | Technology & Engineering |
ISBN | 3731510243 |
Magnetic fusion is one approach to generate thermonuclear fusion power in an environmental friendly way. The Electron Cyclotron Resonance Heating is considered as the major concept for startup, heating and control of the fusion plasma. Megawatt-class gyrotrons generate the required microwave power. This work focuses on advanced key components and technologies for a DEMO relevant 2 MW gyrotron. One major focus is on the development of advanced Magnetron Injection Guns. Another focus is on the red
MultPhysics Modelling towards the Stabilization of PAN Fibers with Microwaves Based on Experimental Data
Title | MultPhysics Modelling towards the Stabilization of PAN Fibers with Microwaves Based on Experimental Data PDF eBook |
Author | Hofele, Julia |
Publisher | KIT Scientific Publishing |
Pages | 174 |
Release | 2024-07-10 |
Genre | |
ISBN | 3731513501 |
High energy demand is one reason for high costs of carbon fibers. One option to decrease them is to use microwave heating instead of conventional heating. In this work, steps towards a microwave assisted process during the stabilization phase are presented. In-situ dielectric measurements are performed and a reaction kinetics model is setup in connection to the dielectric loss. This allows to calculate a stabilization degree and fiber temperatures leading to a basic process understanding.
Multi-stage Depressed Collector for Small Orbit Gyrotrons
Title | Multi-stage Depressed Collector for Small Orbit Gyrotrons PDF eBook |
Author | |
Publisher | |
Pages | |
Release | 1998 |
Genre | |
ISBN |
A multi-stage depressed collector for receiving energy from a small orbit gyrating electron beam employs a plurality of electrodes at different potentials for sorting the individual electrons on the basis of their total energy level. Magnetic field generating coils, for producing magnetic fields and magnetic iron for magnetic field shaping produce adiabatic and controlled non-adiabatic transitions of the incident electron beam to further facilitate the sorting.
Energy-efficient, scalable and modular industrial microwave applicator for high temperature alkaline hydrolysis of PET
Title | Energy-efficient, scalable and modular industrial microwave applicator for high temperature alkaline hydrolysis of PET PDF eBook |
Author | Ramopoulos, Vasileios |
Publisher | KIT Scientific Publishing |
Pages | 162 |
Release | 2023-01-27 |
Genre | Technology & Engineering |
ISBN | 3731510995 |
Microwave-assisted alkaline hydrolysis of PET can be 20 times faster and at lower temperatures. This work presents a novel industrial microwave applicator at 2.45 GHz with homogeneous distribution to support this reaction, which allows an efficient and continuous operation. In addition, an innovative dielectric and calorimetric measurements setup is presented. Furthermore, the modelling of the reaction kinetics based on the measured dielectric parameters is presented.