The Study Of Imaging Diagnosis Technology Of Fast Ion D_α

Carrying out the fast ions imaging diagnosis which are the important parameters of the diagnosis of burning plasma fusion product will be a tool of that, to carry out the diagnosis of constraint, transport, assessment of high energy plasma in the burning plasma fusion, which is a physical problems focused by ITER. At the same time, it provides a strong support for the safety operation and steady state experiment of ITER.Fast ions in magnetic confinement fusion devices are produced by neutral beam injection, ion cyclotron resonance heating, and fusion reaction. The fast ions in the fusion device charge exchange with the injected neutral beam particle deuterium atom by the collision. And some of them turn into a neutral particles with excited state, after a period of linear motion, some will transition from the energy level of n=3 to the n=2 with the emission of visible Dα line.At the same time obvious doppler frequency shift will happen. The main purpose of this diagnostic system is to obtain the visible Dαspectrum witch also be called FIDA spectrum in HL-2A device when the neutral beam was injected in.The difficulty is how to separate FIDA spectral from the others in the same spectral range. ‘The others’ mainly include the Dα spectrum of halo neutral particles, the spectrum of injected neutral beam, and the spectrum from visible bremsstrahlung as well as the spectrum from impurities CII.In the diagnostic system, we will get the FIDA spectral by using the spectral curve fitting method, and the spectral analysis of complex charge exchange. And the spectral from injected neutral beam and the impurities CII will be removed.And the background subtraction will help us remove the visible bremsstrahlung. In the research of FIDA imaging diagnosis technology, the main works is as following. 1. Designed the FIDA window optical design and hardware design of diagnosis system. And I finished the detection of weak signal under the strong background. 2. Processed and analysed the data collected for the FIDA diagnosis system of HL-2A. Through the process of fitting spectrum curve, got the required FIDA signals. And then in this paper, I compared the intensity under different injected beam power. And it proved that with the increase of injected beam power, the intensity of the fast-ions and FIDA signal will increase. 3. Studied the FIDA simulation program FIDASIM source code carefully, and then done the research and discussion of program inputs and outputs and extract the outline, after that, I debugged the program to make it work, and wrote the related documentations. At last, used the FIDASIM to simulate the FIDA diagnosis. 4. Done the simulation by using FIDASIM, simulated the relationship between different sight location and injected beam power as well as energy.