中性束束流品质对偏转系统窗口设计的影响
Effect of neutral beam quality on design of window in bending system
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摘要: 介绍了EAST第一条中性束注入束线内部偏转系统的结构。以参数为80 keV，70 A的氘束作为参考束，分析了经过中性化气体靶后，束流中高能粒子的能量成分；通过计算不同能量离子的偏转半径，说明了束截面在纵向的扩展情况；阐述了束散角的产生原理，分析了束散角对偏转系统窗口设计的影响。结果表明，偏转系统入射窗口和出射窗口尺寸一般和入射束的尺寸一致；偏转系统入射窗口和回转窗口的尺寸和相对位置满足一定条件，可使装置的热负荷相对较小，且各部分热负荷相对均匀。Abstract: The structure of neutral beam injector on EAST is introduced. Neutral beam usually contains three kinds of high-energy ions, which do not lost charge in the neutralizer. Taking a deuterium beam with energy of 80 keV as a reference beam, the paper calculates radius of ions with different energy and explains the section extension. As a result, three dimension relation of window in bending system is given. Then, principle of the cause of divergence angle is described. Effect of divergence angle on design of window in bending system is analyzed. The result and analysis illustrate that dimension of entrance window and return window have the same numerical value as that of beam. When relative position and dimension between entrance window and return window is reasonable, energy deposition at inj
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