Status of the high brightness polarized electron source using transmission photocathode
Status of the high brightness polarized electron source using transmission photocathode
复制标题
透射光电阴极高亮度偏振电子源的现状
DOI：
10.1088/1742-6596/298/1/012017
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
他
中科院分区：
文献类型：
--
作者：
X.G.Jin;T.Ujihara;Y.Takeda;他
最近，我们开发了一种传输型极化电子源（PES），用于产生高亮度光束。所研制的PES可在4 mm电极间隙处施加20 kV的提取电压，并能实现几微米的源束半径。作为原型枪实验的结果，亮度为~ 2× 10 7 a cm−2。得到的电荷密度寿命为1.8× 108c . cm−2。采用GaAs-GaAsP应变超晶格层的透射光电阴极，同时获得了最大极化率~ 90%和量子效率0.09%。到目前为止，又制造了两支电子枪，其机械设计与原型机基本相同。原型炮和第二炮已经分别用于光电阴极研发和Spin-LEEM应用。在不久的将来，将使用第三门炮进行进一步的实验。
Recently, we have developed a transmission-type polarized electron sources (PES) s for the generation of a high brightness beam. The developed PES can applied the extraction voltage of 20 kV at 4 mm electrode-gap and enables to realize the source beam radius of a few micro meter. As the results of prototype gun experiments, the brightness of∼ 2× 10 7 A. cm− 2. sr− 1 and a charge density lifetime of 1.8× 10 8 C. cm− 2 were obtained. A maximum polarization of~ 90% and quantum efficiency of 0.09% was achieved simultaneously using the transmission photocathode with GaAs-GaAsP strained superlattice layers. Up to now, another two electron gun was manufactured, and those mechanical designs are almost same as that of the prototype. The prototype gun and the second gun have been already operated for the photocathode R&D and for the Spin-LEEM application, respectively. In the near future, further experiments are prepared by using the third gun.