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首页> 外文期刊>Physica, B. Condensed Matter >Optimised adiabatic fast passage spin flipping for ~3He neutron spin filters
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Optimised adiabatic fast passage spin flipping for ~3He neutron spin filters

机译:为3He中子自旋滤光片优化的绝热快速通道自旋翻转

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摘要

We describe here a method of performing adiabatic fast passage (AFP) spin flipping of polarized ~3He used as a neutron spin filter (NSF) to polarize neutron beams. By reversing the spin states of the ~3He nuclei the polarization of a neutron beam can be efficiently reversed allowing for the transmission of a neutron beam polarized in either spin state. Using an amplitude modulated frequency sweep lasting 500 ms we can spin flip a polarized ~3He neutron spin filter with only 1.8×10~(-5) loss in ~3He polarization. The small magnetic fields (1015 G) used to house neutron spin filters mean the ~3He resonant frequencies are low enough to be generated using a computer with a digital I/O card. The versatility of this systems allows AFP to be performed on any beamline or in any laboratory using ~3He neutron spin filters and polarization losses can be minimised by adjusting sweep parameters.
机译:我们在这里描述一种执行极化的〜3He绝热快速通过(AFP)自旋翻转的方法,该方法用作中子自旋滤波器(NSF)来极化中子束。通过反转〜3He核的自旋态,可以有效地反转中子束的极化,从而允许以任一自旋态极化的中子束的透射。使用持续500 ms的调幅扫频,我们可以自旋翻转极化的〜3He中子自旋滤波器,在〜3He极化中损耗仅为1.8×10〜(-5)。用于容纳中子自旋滤波器的小磁场(1015 G)意味着〜3He共振频率足够低,可以使用带有数字I / O卡的计算机生成。该系统的多功能性允许使用〜3He中子自旋滤波器在任何光束线上或在任何实验室中执行AFP,并且可以通过调整扫描参数将极化损耗最小化。

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