Murphy JB, Kramer SL
National Synchrotron Light Source, Building 725C, Brookhaven National Laboratory, Upton, New York 11973, USA.
Phys Rev Lett. 2000 Jun 12;84(24):5516-9. doi: 10.1103/PhysRevLett.84.5516.
We present the first experimental evidence confirming the theoretical predictions of alpha buckets in an electron storage ring. By controlling both the first- and second-order momentum compaction factors, we succeeded in storing electrons simultaneously in a pair of alpha buckets or in either bucket alone. The two electron bunches are separated in energy by slightly less than 1% and the energy is tunable over a narrow range. The energy difference was directly measured using synchrotron light from an undulator. Simultaneous two-color light beams from an undulator were generated. By changing the rf voltage, we were able to vary the normally fixed longitudinal bunch separation.
我们展示了首个实验证据，证实了电子储存环中α桶的理论预测。通过控制一阶和二阶动量压缩因子，我们成功地将电子同时存储在一对α桶中，或单独存储在任一桶中。两束电子束在能量上的分离略小于1%，且能量可在窄范围内调节。利用来自波荡器的同步辐射光直接测量了能量差。产生了来自波荡器的同时双色光束。通过改变射频电压，我们能够改变通常固定的纵向束团间距。
