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The CERN Resonant WISP Search (CROWS)

Produktform: Buch / Einband - flex.(Paperback)

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.

Verlag: KIT Scientific Publishing, 209 Seiten

Erscheinungsdatum: 02.05.2014

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Design studies towards a 4 MW 170 GHz coaxial-cavity gyrotron

Produktform: Buch / Einband - flex.(Paperback)

In this work the feasibility of a 4 MW 170 GHz coaxial-cavity gyrotron for continuous wave operation is demonstrated. For the first time complete physical designs of the major gyrotron components are elaborated. In a first step, one possible new operating mode is determined, followed by the development of detailed physical designs of the major gyrotron components: Diode and triode type electron gun, coaxial cavity, two-beam quasi-optical output coupler and depressed collector.

Verlag: KIT Scientific Publishing, 220 Seiten

Erscheinungsdatum: 25.07.2011

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Diffraction and Scattering in Launchers of Quasi-Optical Mode Converters for Gyrotrons

Produktform: Buch / Einband - flex.(Paperback)

In this work different methods for the calculation of diffraction and scattering in launchers of quasi-optical mode converters for gyrotrons are compared, ranked and extended. The extension gives the opportunity to take a tapered average radius of the waveguide antenna into account. The comparison and the extension of the fast field calculation methods for component synthesis opens the possibility to reduce diffraction and stray radiation of reliable and powerful millimeter wave sources.

Verlag: KIT Scientific Publishing, 160 Seiten

Erscheinungsdatum: 09.05.2012

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Time-dependent spectrum analysis of high power gyrotrons

Produktform: Buch / Einband - flex.(Paperback)

In this work, a novel measurement system for the analysis of the gyrotron RF output spectrum was developed. It enables unprecedented time dependent measurements within a large bandwidth, dynamic range and unambiguous RF indication in the entire D-Band (110-170 GHz). Special attention was given to the investigation of parasitic RF oscillations, and the analysis of the interplay of thermal cavity expansion and ionization-based space charge neutralization at the start of long RF pulses.

Verlag: KIT Scientific Publishing, 318 Seiten

Erscheinungsdatum: 06.08.2015

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Investigations of After Cavity Interaction in Gyrotrons Including the Effect of Non-uniform Magnetic Field

Produktform: Buch / Einband - flex.(Paperback)

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.

Verlag: KIT Scientific Publishing, 142 Seiten

Erscheinungsdatum: 05.02.2014

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