Application of counter Helmholtz’s coils in the magneto optical trap

In this paper, theoretical calculation to related parameter of the counter-Helmholtz's coils is first processed, and experimentalized it later. It was found that time constant T is always fell short of destined target. Think over winding parameter and the correlative theoretical calculation is processed. Additionally, we improved experimental testing set. Here, the measured time constant is accorded with destined target, viz. T<1 ms.