Investigations of After Cavity Interaction in Gyrotrons Including the Effect of Non-uniform Magnetic Field PDF Download
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Author: Roy Choudhury, Amitavo
Publisher: KIT Scientific Publishing
ISBN: 3731501295
Category : Technology & Engineering
Languages : en
Pages : 146
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Book Description
Dynamic after-cavity interaction (ACI) in megawatt-class gyrotrons is investigated that could lead to lower output mode purity and increased level of internal stray radiation. The self-consistent KIT-IHM multi-mode-code SELFT has been modified to extend the simulation domain into the radius up-taper section of the gyrotron cavity where the probability of ACI exists. Studies on four different gyrotron configurations confirm that undesired interactions in the up-taper region can result in additional parasitic oscillations with relative power in the 1%-range.
Author: Roy Choudhury, Amitavo
Publisher: KIT Scientific Publishing
ISBN: 3731501295
Category : Technology & Engineering
Languages : en
Pages : 146
Get Book Here
Book Description
Dynamic after-cavity interaction (ACI) in megawatt-class gyrotrons is investigated that could lead to lower output mode purity and increased level of internal stray radiation. The self-consistent KIT-IHM multi-mode-code SELFT has been modified to extend the simulation domain into the radius up-taper section of the gyrotron cavity where the probability of ACI exists. Studies on four different gyrotron configurations confirm that undesired interactions in the up-taper region can result in additional parasitic oscillations with relative power in the 1%-range.
Author: Amitavo Roy Choudhury
Publisher:
ISBN: 9781013283802
Category : Technology & Engineering
Languages : en
Pages : 142
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Book Description
Dynamic after-cavity interaction (ACI) in megawatt-class gyrotrons is investigated that could lead to lower output mode purity and increased level of internal stray radiation. The self-consistent KIT-IHM multi-mode-code SELFT has been modified to extend the simulation domain into the radius up-taper section of the gyrotron cavity where the probability of ACI exists. Studies on four different gyrotron configurations confirm that undesired interactions in the up-taper region can result in additional parasitic oscillations with relative power in the 1%-range. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Author: Hochberg, Martin
Publisher: KIT Scientific Publishing
ISBN: 373150958X
Category : Technology & Engineering
Languages : en
Pages : 198
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Book Description
Author: Ramopoulos, Vasileios
Publisher: KIT Scientific Publishing
ISBN: 3731510995
Category : Technology & Engineering
Languages : en
Pages : 162
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Book Description
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.
Author: Marek, Alexander
Publisher: KIT Scientific Publishing
ISBN: 3731512505
Category : Technology & Engineering
Languages : en
Pages : 322
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Book Description
This work presents the development of a new sub-THz source for the generation of trains of coherent high-power ultra-short pulses at 263 GHz via passive mode-locking of two coupled helical gyro-TWTs. For the first time, it is shown that the operation of such passive mode-locked helical gyro-TWTs in the hard excitation regime is of particular importance to reach the optimal coherency of the generated pulses. This could be of particular interest for some new time-domain DNP-NMR methods.
Author: Prastiyanto, Dhidik
Publisher: KIT Scientific Publishing
ISBN: 3731504243
Category : Dielectric measurements
Languages : en
Pages : 204
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Book Description
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.
Author: Betz, Michael
Publisher: KIT Scientific Publishing
ISBN: 3731501996
Category : Science
Languages : en
Pages : 212
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Book Description
The subject of this work is the design, implementation and first results of the "CERN Resonant WISP Search" (CROWS), which probes the existence of Axion Like Particles and Hidden Sector Photons (HSPs) using microwave techniques. By exploiting low loss cavity resonators, multiple layers of electromagnetic shielding and a micro-Hz bandwidth detection scheme, new exclusion limits could be set. For HSPs, sensitivity was improved by a factor of 7 compared to previous laboratory experiments.
Author: Zhang, Jianghua
Publisher: KIT Scientific Publishing
ISBN: 3731505789
Category : Technology (General)
Languages : en
Pages : 226
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Book Description
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.
Author: Malygin, Anton
Publisher: KIT Scientific Publishing
ISBN: 3731505843
Category : Technology (General)
Languages : en
Pages : 162
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Book Description
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 %.
Author: Franck, Joachim
Publisher: KIT Scientific Publishing
ISBN: 3731506521
Category : Technology (General)
Languages : en
Pages : 274
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Book Description
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.
