MEASUREMENT OF NEAR-MEGAWATT MILLIMETER-WAVE BEAMS -- OVERSIZED TRANSMISSION LINES FOR GYROTRON-BASED TECHNOLOGICAL OVENS AND PLASMA-CHEMICAL REACTORS -- DEVELOPMENT OF LUMPED AND DISTRIBUTED MODELS FOR ACCURATE MEASUREMENTS OF Q-FACTORS OF QUASIOPTICAL RESONATORS -- THE MODE-MATCHING TECHNIQUE AND FAST NUMERICAL MODELS OF ARBITRARY COORDINATE WAVEGUIDE OBJECTS -- ELECTRIC FIELD INTEGRAL EQUATION ANALYSIS AND ADVANCED OPTIMIZATION OF QUASI-OPTICAL LAUNCHERS USED IN HIGH POWER GYROTRONS -- COMPARISON OF TWO OPTIMIZATION CRITERIA FOR QUASI-OPTICAL POWER TRANSMISSION LINES -- A GENERAL PURPOSE ELECTROMAGNETIC CODE FOR DESIGNING MICROWAVE COMPONENTS -- AMPLIFICATION AND GENERATION OF HIGHPOWER MICROWAVE BY RELATIVISTIC ELECTRON BEAMS IN SECTIONED SYSTEMS -- MICROWAVE DEVICES WITH HELICALLY CORRUGATED WAVEGUIDES -- QUASI-OPTICAL TRANSMISSION LINES ATCIEMAT AND AT GPI -- SUPERRADIANCE OF INTENSE ELECTRON BUNCHES -- TRANSMISSION LINE COMPONENTS FOR A FUTURE MILLIMETER-WAVE HIGHGRADIENT LINEAR ACCELERATOR -- FERRITE PHASE SHIFTERS FOR Ka BAND ARRAY ANTENNAS -- PROPAGATION OF WAVE TRAINS OF FINITE EXTENT ON WIDE, THIN-WALLED ELECTRON BEAMS -- QUASI-OPTICAL MULTIPLEXERS FOR SPACE COMMUNICATION AND RADAR WITH SYNTHESIZED FREQUENCY BAND -- ACTIVE COMPRESSION OF RF PULSES -- CONTROL OF INTENSE MILLIMETER WAVE PROPAGATION BY TAILORING THE DISPERSIVE PROPERTIES OF THE MEDIUM -- HIGH-POWER MILLIMETREWAVE TRANSMISSION SYSTEMS AND COMPONENTS FOR ELECTRON CYCLOTRON HEATING OF FUSION PLASMAS -- SPACE-FREQUENCY MODEL OF ULTRA WIDEBAND INTERACTIONS IN MILLIMETER WAVE MASERS -- BI-STATIC FORWARD-SCATTER RADAR WITH SPACE-BASED TRANSMITTER -- ANALYSIS OF NANOSECOND GIGAWATT RADAR -- HIGH POWER MICROWAVE SPECTROSCOPY -- A MULTIPACTOR THRESHOLD IN WAVEGUIDES: THEORY AND EXPERIMENT -- QUASI-OPTICAL MODE CONVERTERS IN ADVANCED HIGH-POWER GYROTRONS FOR NUCLEAR FUSION PLASMA HEATING -- RADAR AND COMMUNICATION SYSTEMS: SOME TRENDS OF DEVELOPMENT -- ON ANTENNA SYSTEMS FOR SPACE APPLICATIONS -- INTENSE MICROWAVE PULSE TRANSMISSION THROUGH ELECTRICALLY CONTROLLED FERRITE PHASE SHIFTERS.Between February 17 and 20, 2004, approximately fifty scientists from ten countries came together at the Institute of Applied Physics (IAP), Nizhny Novgorod, Russia to participate in a NATO sponsored Advanced Research Workshop whose appellation is re flected in the title of this volume, namely Quasi Optical Control of Intense Microwave Transmission. The fashionable label “quasi optical ” has come into use in recent decades to denote structures whose characteristic dimensions exceed (sometimes by large factors) the free space radiation wavelength. Such structures were and are developed to replace the traditional single eigenmode ones in situations when high frequenc ies (short wavelengths) are combined with high powers, a combination that could otherwise lead to RF breakdown and high Ohmic wall heating rates. Treatments of guided wave propagation in oversized structures is aimed at pr eserving the propagating field coherence and thus to provide efficient transmission of RF power to remote destinations such as antennas, microwave ovens, plasma chemical reactors, nuclear fusion machines, and the like.