The Analysis And Measurement Of Beam Stream For Neutral Beam Injection System

It is very significant for the research of nucleus fusion in resolving energy sources shortage, and neutral beam injection (NB1) heating is one of the important assistant heating methods in nucleus fusion.The beam loss on the beam line is analyzed after the introducing of principle and structure of NBI system. The beam absorption targets are designed for measuring the lost beam power, and as an emphases, the calorimeter is designed in detail to measure the beam power and the distribution of beam power density. To attain the high-power, well-proportioned and steady high-energy particle beam is the base of analyzing beam loss. The factors that influence the emission performance of the filament are analyzed, and the parameters are calculated. The experiment results proved the correctness of analyses. There is a part of beam loss during the course as the neutralization of high-energy particles dragged from the ion source, the deflexion of charged particle on the beam stream and the scraped beam of exceeding beam waist and low density. It is necessary to analyze the beam loss and bring forward a rational project for absorbing beam stream.To measure the beam power and the distribution of beam power density, as an emphasis, a calorimeter is designed. The characteristics of the measurement methods are introduced and all parts of the calorimeter are designed. The quantity of heat transfer and the factors that effect measuring error are.analyzed.