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Thermionic RF guns are the source of electrons used in many practical applications, such as drivers for synchrotron light sources, preferred for their compactness and efficiency. RadiaBeam Systems has developed a new thermionic RF gun for the Advanced Photon Source at Argonne National Laboratory, which would offer substantial improvements in reliable operations with robust interface between the thermionic cathode and the cavity, as well as better RF performance, compared to existing models. This improvement became possible by incorporating new pi-mode electromagnetic design, robust cavity back plate design, and a cooling system that will allow stable operation for up to 1 A of beam current and 100 Hz rep rate at 3.0 μs RF pulse length, and 70 MV/m peak on axis field in the cavity. In this paper we discuss the electromagnetic and engineering design of the cavity and provide the test results of the new gun.

Los resultados obtenidos indican que un país de América del Sur es el más afectado por los decesos, esto, a pesar de que los países que presentan un mayor número de contagios pertenecen a Europa. El estudio pretende identificar los sitios de mayor contagio con el propósito de guiar estudios ulteriores de patrones indicadores de causas de los valores encontrados en este artículo. The study aims to identify the sites of greatest contagions in order to guide further studies to help decision makers. En (Guo, 2021) se establece un indicador de actividad comunitaria que expresa a mayor valor de este, mayor posibilidad de contagio. Estos datos, se procesan utilizando paquetes del lenguaje Python, en particular Pandas y Mathplotlib, usando computadoras personales con procesador Core i7 3.5 Mhz y DDR4 16 Gb RAM.