钠的大原子数玻色-爱因斯坦凝聚体
Large atom number Bose-Einstein condensate of sodium
摘要：
我们描述了产生一个包含超过120 × 10^6个原子的大型玻色-爱因斯坦凝聚体的装置。在实验中，热光束被塞曼减速器减速，并被暗斑磁光阱（MOT）捕获。在我们的实验中，一个典型的暗斑MOT包含2.0x10^10个原子，温度为320微K，密度约为1.0x10^11个原子/cm ^3。在将原子加载到磁阱中之前，样品在高磁场中自旋极化。与没有自旋极化的实验相比，在高磁场中的自旋极化导致转移效率增加2倍。在磁阱中，云通过蒸发冷却在50 s内被冷却到简并.为了抑制蒸发结束时的三体损耗，磁阱在轴向方向上减压。
英文摘要：
We describe the setup to create a large Bose-Einstein condensate containing more than 120x10^6 atoms. In the experiment a thermal beam is slowed by a Zeeman slower and captured in a dark-spot magneto-optical trap (MOT). A typical dark-spot MOT in our experiments contains 2.0x10^10 atoms with a temperature of 320 microK and a density of about 1.0x10^11 atoms/cm^3. The sample is spin polarized in a high magnetic field, before the atoms are loaded in the magnetic trap. Spin polarizing in a high magnetic field results in an increase in the transfer efficiency by a factor of 2 compared to experiments without spin polarizing. In the magnetic trap the cloud is cooled to degeneracy in 50 s by evaporative cooling. To suppress the 3-body losses at the end of the evaporation the magnetic trap is decompressed in the axial direction.
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