Sökning: "chopper"
Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet chopper.
1. On the Challenges for Time-of-Flight Electron Spectroscopy at Storage Rings
Sammanfattning : Time-of-flight (TOF) techniques for energy analysis have been common in electron spectroscopy for many decades. TOF-based electron spectrometers benefit from higher transmission and information rate compared to their main competitor: the hemispherical analyser; the drawback being their lower energy resolution. LÄS MER
2. A New Paradigm for Large Brushless Hydrogenerators : Advantages Beyond the Static System
Sammanfattning : The grid code, FIKS, from the Norwegian transmission system operator (TSO), Statnett, states that synchronous generators > 25MVA, must have a static excitation system. However, an improved brushless excitation system is in operation on some commercial power plants (36MVA, 93.75rpm & 52MVA, 166. LÄS MER
3. Techniques and Application of Electron Spectroscopy Based on Novel X-ray Sources
Sammanfattning : The curiosity of researchers to find novel characteristics and properties of matter constantly pushes for the development of instrumentation based on X-radiation. I present in this thesis techniques for electron spectroscopy based on developments of X-ray sources both in time structure and energy. LÄS MER
4. Design and Implementation of RF Kickers in MAX IV
Sammanfattning : The MAX IV facility in Lund, Sweden, consists of two storage rings for production of synchrotron radiation, and a full-energy LINAC for top-up injections. The LINAC also delivers short high-intensity electron bunches to a short pulse facility. LÄS MER
5. Fault Behavior of Wind Turbines
Sammanfattning : Synchronous generators have always been the dominant generation type in the grid. This fact affected both planning and operation of power systems. With the fast increase of wind power share in the grid in the last decade, the situation is changing. In some countries wind power represents already a consistent amount of the total generation. LÄS MER