| In the study of magnetic confinement fusion,electron cyclotron resonance heating（ECRH）is widely used in heating,current drive,auxiliary start,MHD instability inhibition and other aspects due to its strong locality,high coupling efficiency and launcher away from plasma.Currently,research work on the 105 GHz ECRH system is being carried out on J-TEXT devices.As an important subsystem of the ECRH system,the launcher plays an important role in adjusting the angle of the microwave into the plasma.Based on this requirement,an launcher with independent circumferential and polar adjustments and a unidirectional adjustment angle of 28°in both the circumferential direction and the polar direction is designed.Theoretical calculations show that the launcher can make the deposition radius of the microwave in the plasma center about 20mm.This article consists of four main parts:The first part briefly introduces the ECRH system and combines the antenna of the ECRH system on the ITER device to introduce the antenna structure.The second part introduces the basic theory of launcher design.The condition that the HE11mode can be approximated as Gaussian mode at the waveguide is analyzed.The power of the Gaussian beam is analyzed.Combining Astron-Allis equation and CMA diagram,the problem of wave accessibility is analyzed,and it is confirmed that the X2 mode electron cyclotron wave of J-TEXT device ECRH system satisfies the accessibility conditions.Finally,the resonance conditions of the electron cyclotron wave and the particle are given.The third part starts from the design goal and gives a preliminary plan for launcher design.The dual mirror scheme is determined in conjunction with the specific parameters of the J-TEXT device window.The optical part design is completed by the principle of quasi-optics,and the design of the launcher rotating mechanism is completed and analyzed.In the fourth part,the launcher assembly is introduced.The He-Ne laser is used to complete the calibration work on the optical platform.Finally,Finally,the platform and engineering test are carried out.The fifth part summarizes the whole work and looks forward to the future work. |
