Research Of Pulse Source For Space X-ray Communication

With the continuous development of modern science and technology, the use ofmicrowave, infrared, visible light, ultraviolet band as carrier communicationtechnology has been widely used in different environments, as part of theelectromagnetic spectrum, X-ray，between ultraviolet wavelengths and γ-ray, nowcommonly used in medical testing, nondestructive testing and biomedical field as animaging beam, but the application in communications is still a blank. In the modernsociety, the electromagnetic spectrum resources take advantage of commercial andresidential. With the passage of time, the demand for spectrum resources is growingexponentially. This paper studies the pulsed X-ray emission source, its gate controlvoltage, carrier quality, the receiving device, the transmission error rate and theelectronics design will have a significant impact, and it plays a key role in the overallperformance of the communication system.Currently, the methods of producing X-ray include thermionic emission X-raytube, laser plasma, synchrotron radiation X-ray source and X-ray laser. Consideringthe X-ray emission device on the structure size, power consumption, efficiency, andthe modulation frequency requirements, combined with the professional advantagesof this team, we put forward the concept of grid control X-ray emission source,abbreviation for “grid-controlled X-ray source”.This article introduces the computer modeling and simulation technology to thegrid-controlled X-ray source of the design process and build a gate control X-raysource simulation model using Particle Studio software. The results of simulationand analysis include the internal potential distribution, particle trajectory, the actualfocal spot and a grid-controlled characteristic. The simulation results show that:potential distribution within the grid-controlled X-ray source of the gate window inthe most obvious change, the electron beam run to grid window has obviousfocusing effect on the role of electrostatic field in the grid; The cut-off voltage is-10V, conduction voltage is0V, and the actual focal spot size on the anode target is0.4mm×4mm.In the fifth chapter, we produce the grid-controlled X-ray source and test theenergy spectrum of Molybdenum in the experiment. Through the comparison andanalysis on the data, characteristic spectral arise in20-21keV. And the cut off voltageis-10V in the experimental test, it turn out that the test results are well consistent with the simulation results. Finally, the digital signal, frequency10kHz, duty ratio of50%, a high level of0, a low level of-10V, transmitted successfully in thevacuum X-ray experimental system. Experimental test results show that this paperaccording to the results of simulation software design, production of grid-controlledX-ray source of performance parameters meet the requirements of the experimentalsystem. It provides a solid foundation for the next progress of X-ray spacecommunications.