自旋滤波极化建立的动力学
Dynamics of polarization buildup by spin filtering
摘要：
在GSI达姆施塔特的PAX（极化反质子实验）项目最近提出的建议的推动下，最近对反质子束的极化进行了许多研究。它计划通过与储存环中极化的内部靶反复相互作用来激发反质子束。通过自旋过滤极化的方法要求许多束粒子在通过电磁和强子相互作用从极化的内部目标散射后保持在环内。我们提出并解决了微分方程组，描述了在许多不同的情况下，感兴趣的项目计划产生高强度的偏振光束的自旋过滤的偏振的积累。这些方案是：1）对完全存储的射束进行自旋过滤，2）在累积射束的同时进行自旋过滤，即，将未偏振的粒子连续地馈送到射束中，3）粒子输入速率等于由于散射超过环接受角而导致粒子损失的速率，射束强度保持恒定，4）通过自旋过滤增加存储射束的初始偏振，5）在一定量的时间之后停止粒子到束中的输入，但是自旋过滤继续。存储的偏振光束通过电子冷却器时的退偏振率也可以忽略不计。
英文摘要：
There has been much recent research into polarizing an antiproton beam, instigated by the recent proposal from the PAX (Polarized Antiproton eXperiment) project at GSI Darmstadt. It plans to polarize an antiproton beam by repeated interaction with a polarized internal target in a storage ring. The method of polarization by spin filtering requires many of the beam particles to remain within the ring after scattering off the polarized internal target via electromagnetic and hadronic interactions. We present and solve sets of differential equations which describe the buildup of polarization by spin filtering in many different scenarios of interest to projects planning to produce high intensity polarized beams. These scenarios are: 1) spin filtering of a fully stored beam, 2) spin filtering while the beam is being accumulated, i.e. unpolarized particles are continuously being fed into the beam, 3) the particle input rate is equal to the rate at which particles are being lost due to scattering beyond ring acceptance angle, the beam intensity remaining constant, 4) increasing the initial polarization of a stored beam by spin filtering, 5) the input of particles into the beam is stopped after a certain amount of time, but spin filtering continues. The rate of depolarization of a stored polarized beam on passing through an electron cooler is also shown to be negligible.
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