The Research On Non-heater Hollow Cathode

It is necessary for the traditional hollow cathode staring, it needs a electric wireheater. Coupled with an appropriate voltage when the device temperature reaches acertain height, the hollow cathode start working. This experiment said a Non-heaterhollow cathode with the conventional hollow cathode is different in that: Non-heaterhollow cathode starting does not require the electric wire heater to energize and heat, itis possible to reduce energy consumption, to a certain extent, such hollow cathodestructure is more simple than conventional hollow cathode, and it is contribute to reducethe weight of the cathode itself, the optimization of the volume, the improvement inreliability. In the field of aerospace, components reduce weight and volume does notonly mean a huge economic value and improve success rate of space flight, thespacecraft can carry more fuel or other laboratory equipment, so a new, more optimizedhollow cathode has a huge significance in all respects. It is reported that: foreignresearchers have successfully developed a way to start without heating hollow cathode.Against to the above problems, this thesis studied and analyzed on the basis of thetheory of the gas discharge and the hollow cathode discharge, then proposed a coldheater hollow structure with no need heating electric wire, referred to Non-heaterhollow cathode. And gas discharge characteristics of particles, the structure of thedischarge characteristics and the cathode heating efficiency conducted extensivesimulation analysis and experimental tests. Main research content, such as thefollowing:1. Study the Non-heater hollow cathode structure mechanism and productionprocess, proposed a more traditional hollow cathode structure is simpler, more compact,more efficient heating of the hollow cathode structure. The structure using an auxiliaryanode to provide an initial electric field, prompting the plasma gas exist within minoritydirectional migration movement, through continuous collision the heated cathode be acathode the rated thermal emission temperature, which can be self-sustaining discharge.Successfully prepared by the production process of the structure of the hollow cathode without thermal sub hollow cathode devices, can be achieved within a very short timethe effect of the cathode heating.2. Study the internal heater hollow cathode discharge characteristics of the particlesin the structure. Dynamic principle, reasonable assumptions, by numerical simulation,and analysis of the characteristics of the new hollow cathode structure is different fromthe traditional hollow cathode internal particle motion. Monte Carlo particle simulation,a comprehensive analysis of the sheath and particle energy transfer process heaterhollow cathode heating process, the particle density distribution for the next experimenthas laid a theoretical foundation.3. Test the Non-heater hollow cathode discharge characteristics, proposed a threeexperimental system which ignited needs presenting with a touch holding pole, anauxiliary anode. Studied and analyzed the thermal sub-hollow cathode structure, theignition voltage and the heating in different gas flow efficiency, and gas flow rate on thedischarge voltage characteristics. The experiments show that the structure of the hollowcathode,1min cathode is heated to more than16000C, the anode voltage is only75V,the current density can be drawn will be able to achieve20~30A/cm~2.