Abstract: Provided is a resonant structure including a microwave cavity and a sideline radio-frequency (RF) power coupler including: an inner conductor; an outer conductor sharing a central axis with the inner conductor, the outer conductor being electrically coupled to an outer wall of the microwave cavity; and an insulation layer between the inner conductor and the outer conductor.

Abstract: A method of bunch length compression method for a free electron laser (FEL) that avoids parasitic compressions by 1) applying acceleration on the falling portion of the RF waveform, 2) compressing using a positive momentum compaction (R56>0), and 3) compensating for aberration by using nonlinear magnets in the compressor beam line.

Abstract: A method of bunch length compression method for a free electron laser (FEL) that avoids parasitic compressions by 1) applying acceleration on the falling portion of the RF waveform, 2) compressing using a positive momentum compaction (R56>0), and 3) compensating for aberration by using nonlinear magnets in the compressor beam line.

Abstract: Self-healing photocathode device comprising a photoemissive multi-alkali semiconductor comprising a multi-alkali antimonide having the formula AxBy CzSb, where A, B and C are Group I alkali metals and x+y+z=3; a nanostructured porous membrane, one surface of which is in direct contact with the multi-alkali semiconductor and the opposing surface of which is disposed toward the inside of a sealed reservoir, such that the porous membrane and the sealed reservoir form a volume which is maintained at low pressure; a temperature control means in contact with the porous membrane, wherein the temperature control means regulates the temperature of the porous membrane at 200° C. or less; a source comprising elemental cesium which is releasable into the enclosed volume; and, a current conducting means attached to the source.

Abstract: In a toroidal transmission, wherein power transmission rollers are supported rotatably on pivotable support brackets, the pivot movement of adjacent support brackets is coupled via driver elements which are mounted to the support brackets for pivoting therewith and are arranged axially adjacent to one another and formed by a single component.