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501 Publications
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  • Virtual Cathode Diagnostics with a Large Dynamic Range for a Continuous Wave SRF Photoinjector

    In a SRF photoinjector the close relationship between the laser pulse and the generated electron bunch parameters requires continuous monitoring of some of the laser pulse parameters. A laser diagnostic system, called virtual cathode, is a key part of a system that controls the stability of the laser. One of the main challenges for the virtual cathode is to cover the large dynamic range of the photocathode laser between commissioning at 120 Hz and operation at 1.3 GHz repetition rate with con...

    Struktur und Gitterdynamik von Gruppe V Elementen in ZnO

    Ziel der vorliegenden Arbeit war eine grundlegende und systematische Aufklärung der Mechanismen, die eine stabile p Dotierung von ZnO verhindern. In diesem Zusammenhang wurde eine Kompensation durch Verunreinigungen, aber auch die Bildung von Defektkomplexen und Phasenausscheidungen, die vor allem die Dotiereffizienz herabsetzen, diskutiert. Bezüglich der elektrischen Kompensation durch Verunreinigungen wurde eine Ersetzung der üblichen Saphir Substrate, aus denen Al Atome als Donatoren in d...

    Final Report German Work package K7 Simulation Code Development, Help Desk ESS ID SD015DE

    The work package K7 Simulationscode Entwicklung, Helpdesk comprised the further development of the Monte Carlo simulation package VITESS for the simulation of neutron scattering experiments, its use to study general questions related to ESS instrumentation in collaboration with the ESS Data Management and Software Center DMSC in Copenhagen and support for users. The package contains now a visualization of instrument and trajectories, the possibility for numerical optimization of instru...

    Field Emission Studies of Heat Treated Mo Substrates

    Molybdenum can be used as a substrate for the bi alkali antimonide photocathodes utilized for the generation of high brightness electron beams in a superconducting radio frequency SRF photoinjector cavities. Operation at high field strength is required to obtain a low emittance beam, thus increasing the probability of field emission FE from the cathode surface. Usually, substrates are heated in situ before alkali de position to remove oxide layers from the surface. FE on Mo substrates wa...
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