Study On The Foundation Characters Of The Neutral Beam Injector Based On The Radio Frequency Ion Source

Neutral beam injection (Neutral beam injector) is one of the most effective ways to improve the fusion temperature of the confined plasma, while NBI is also used to drive the plasma current and control the plasma performance. Based on the study of NBI system, further study of the NBI high-power RF ion source technology, and start a series of experimental work.The Experiments using the form of radio frequency discharge to generate the low-temperature high density plasma. Based on the study of the plasma characteristic parameters such as electron temperature and ion density and ion distribution situation, to further optimize the experimental conditions, and improve the plasma parameters, provide the conditions for the realization of the fusion ignition.Experimental studies the effects of the discharge gas pressure, discharge power and external magnetic field intensity for the plasma electron temperature and ion density and ion distribution within the plasma. Using the self-made planar electrostatic probe array similar to the Langmuir probe measured the electron temperature, and obtained the ion density by the classic discharge model, finally using the probe arrays calculated the distribution of plasma inside the ion source. Also for the high-power radio frequency ignition problem, have some UV-induced initial plasma experiments done. It was found that for the hydrogen discharge under the pressure of about0.4Pa getting the highest density of plasma; By adding the ion source with an axial magnetic field, the study found effects of magnetic field on the plasma parameters have a great relationship with antenna; Compared the changes of the plasma characteristics under low power and high power, found that the plasma density increases with the increase of power, almost a linear growth trend. Finally further optimization of plasma parameters according to the experiment, and make a full preparation for realizing the injection of high power high ion-current.