sigma water 中文意思是什麼
sigma water
解釋
水中子俘獲截面-
On the basis of this, we selected rms as feedback variable and constructed the controller g : add this controller to the right of ion radial self - edlctric force equation like equation ( 1 ). we simulated the motion of ion beam by using muti - paticle code ( partice - in - cell ( pic ) code ). the results demonstrated that the beam halo of five different initial distribution is eliminated well under the same controller. the halo intensity of k - v distribution, water - bag distribution and parabolic distribution and be reduced to zero. in the case of 3 - sigma distribution and full gauss distribution, the result is agree with minimum limitation ( 10 " ) of halo intensity of factual high intensity accelerator
在此基礎上，選擇a為控制變量，構造延遲反饋控制器g ： g （ s glrrms （ s ）一rms （ s ） （ 2 ）同（ l ）式一致，將此控制器函數加在粒子徑向所受束自生場力方程的右邊。利用多粒子數值模擬程序（ pic ）進行了控制試驗。模擬結果表明，用同一個控制器和同一個控制參數即可實現五種不同初始分佈情況下的束運一混飩的有效控制。
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