Diffraction and Scattering in Launchers of Quasi Optical Mode Converters for Gyrotrons Jr. Thomas touching subjects of personal interest zwischen Reflektion und Handlungsempfehlungen touching subjects of personal interest (such as osteoclast biology and macrophage electrophysiology) or of current fashion (apopto sis Avner Friedman Robert Gulliver v PREFACE Thestudyofsingularitiesand oscillationsofwaves has progressed along several fronts 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 ranked and extended