John Jelonnek

Director / Professor

Karlsruhe Institute of Technology

Germany

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John Jelonnek is a Director and Professor at the Karlsruhe Institute of Technology in Germany. His research focuses on advanced gyrotron technology, including high-harmonic gyrotrons, microwave-class cavities, and collective Thomson scattering diagnostics. He has published extensively on innovative techniques for enhancing the performance of gyrotron systems, particularly in the context of the Wendelstein 7-X stellarator project.

Articles (16)

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2025

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2024

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2024

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2023

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2023

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2023

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2022

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2022

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2022

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2022

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2022

Collaborators (6)

Sergiy Ponomarenko

Max Planck Institute for Plasma Physics

GERMANY

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Chuanren Wu

Karlsruhe Institute of Technology

GERMANY

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Konstantinos Avramidis

Associate Professor

National and Kapodistrian University of Athens

GREECE

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Jesper Rasmussen

Technical University of Denmark

DENMARK

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Torsten Stange

Max-Planck-Institut für Plasmaphysik Teilinstitut Greifswald

GERMANY

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Laurent Krier

Max-Planck-Institut für Plasmaphysik Teilinstitut Greifswald

GERMANY

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John Jelonnek

Research Interests

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About

Articles (16)

High Azimuthal Mode Selectivity of a Cavity with Mode-Joining Corrugations for High-Harmonic Gyrotrons

Tolerance Investigation on a Helically Corrugated Interaction Circuit of a 265 GHz Gyro-TWA

Development of the 174 GHz collective Thomson scattering diagnostics at Wendelstein 7-X

High-Frequency MW-class Coaxial Gyrotron Cavities Operating at the Second Cyclotron Harmonic

Experimental Results of the Novel 1.5-MW-Class 140-GHz Continuous-Wave Gyrotron for the Wendelstein 7-X Stellarator

Toward the First Continuous Wave Compatible Multistage Depressed Collector Design for High Power Gyrotrons

Simulation of Parasitic Backward-Wave Excitation in High-Power Gyrotron Cavities

An Easy Method to Determine the Effective Conductivity of Carbon Fiber Composites Using a Wall Perturbation Approach

Low Ohmic Losses and Mode Selectivity Provided by a Distributed Bragg Reflector for Cavities of Terahertz Gyrotrons

Novel High-Frequency Electric Field Sweeping Concept for High-Power Gyrotron Collectors

Design of MW-Class Coaxial Gyrotron Cavities With Mode-Converting Corrugation Operating at the Second Cyclotron Harmonic

New Type of sub-THz Frequency-Doubling Gyro-TWT with Helically Corrugated Circuit

Time-Domain Simulation of Helical Gyro-TWTs With Coupled Modes Method and 3-D Particle Beam

A Novel Complex Cavity for Second-Harmonic Subterahertz Gyrotrons: a Tradeoff Between Engineering Tolerance and Mode Selection

The Double-Disk Diamond Window as Backup Broadband Window Solution for the DEMO Electron Cyclotron System

A Multistatic Uniform Diffraction Tomography Algorithm for Microwave Imaging in Multilayered Media for Microwave Drying

Collaborators (6)

Sergiy Ponomarenko

Chuanren Wu

Konstantinos Avramidis

Jesper Rasmussen

Torsten Stange

Laurent Krier

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