Analysis Of Temperature Field And High Voltage Electric Field Of Carbon Nanotube Cold Cathode Micro-focus X-ray Tube And Development Of Encapsulating Component

With the continuous advancement of society and the rapid development of science and technology,the requirements for CT performance are getting higher and higher.CT with traditional hot cathode X-ray tube as the radiation source has been difficult to meet the urgent needs of CT systems with high temporal resolution and high spatial resolution in many disciplines such as biology,archaeology,medicine,and materials science and so on.The carbon nanotube field emission X-ray source has the advantages of high power,small volume,programmable control,etc.It can be used in the CT system to greatly improve the high time resolution and high spatial resolution of the CT system and reduce the radiation of the detected object,etc.it is increasingly becoming a hot spot in the field of X-ray source research,and is also one of the important development directions of new X-ray sources in the future.Since the carbon nanotube field emission X-ray tube uses a carbon nanotube(CNT)material as a source of emitted electrons,there are great differences in electric field distribution,temperature field distribution,and thermal power inside and outside the tube compared to the conventional X-ray tubes with hot cathode.Our research is supported by the National Instrument Special(2013YQ030629)And Conducting research on temperature field,high voltage electric field distribution and package structure of carbon nanotube cold cathode microfocus X-ray tube.The temperature experiment is verified and a set of carbon nanotube cold cathode field emission microfocus X-ray tube encapsulating component was designed.The main research works are as follows:1.Theoretical Simulation Calculation of Temperature Field and High Voltage Electric Field of CNT Cold Cathode Micro-focus X-ray Tube.The temperature field distribution of CNT field emission micro-focus X-ray tube encapsulating component under different power operating conditions and the distribution of electric field strength under different anode voltage conditions were modeled and simulated by Comsol Multiphysics software.By analyzing the simulation results,the designed model is improved and optimized and the optimized physical parameters of the encapsulating component are obtained.2.Structural design of CNT cold cathode micro-focus X-ray tube encapsulating component.The Solidworks software was used to design the package envelope,the specific dimensions of each sub-module were planned,the material selection and processing technology were analyzed,and the engineering drawings were finally generated to complete the developed CNT field emission micro-focus X-ray tube encapsulating component.3.The temperature field distribution of CNT cold cathode micro-focus X-ray tube was tested experimentally.Set up an experimental platform.The temperature field distribution of the CNT field emission micro-focus X-ray tube was tested and compared with the temperature data obtained by the corresponding simulation experiment.The credibility of the simulation results was verified.4.Experimental test of CNT cold cathode micro-focus X-ray source encapsulating components.The existing CT experimental platform was used to test the CNT field emission micro-focus X-ray source encapsulating component.Through the experimental test,it was verified that the developed encapsulating component can meet the actual requirements and achieved good results.