The CERN Resonant WISP Search (CROWS) PDF Download
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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: Betz, Michael
Publisher: KIT Scientific Publishing
ISBN: 3731501996
Category : Science
Languages : en
Pages : 212
Get Book Here
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: 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: Wu, Chuanren
Publisher: KIT Scientific Publishing
ISBN: 3731509342
Category : Technology & Engineering
Languages : en
Pages : 232
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Book Description
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: 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: Wilde, Fabian
Publisher: KIT Scientific Publishing
ISBN: 3731511606
Category :
Languages : en
Pages : 272
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Book Description
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.
Author: Kalaria, Parth Chandulal
Publisher: KIT Scientific Publishing
ISBN: 373150717X
Category : Technology (General)
Languages : en
Pages : 270
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Book Description
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.
Author: Ruess, Sebastian
Publisher: KIT Scientific Publishing
ISBN: 3731510243
Category : Technology & Engineering
Languages : en
Pages : 190
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Book Description
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
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.
