Rugged spin-polarized electron sources based on negative electron affinity GaAs photocathode with robust Cs2Te coating
Rugged spin-polarized electron sources based on negative electron affinity GaAs photocathode with robust Cs2Te coating
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DOI：
10.1063/1.5026701
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发表时间：
2018-04-09
影响因子：
4
通讯作者：
Bazarov, Ivan
中科院分区：
文献类型：
--
作者：
Bae, Jai Kwan;Cultrera, Luca;Bazarov, Ivan
能够提供高强度、高自旋极化电子束且具有较长使用寿命的光电阴极对于电子离子对撞机等下一代核物理设施非常感兴趣。我们报告了由 Cs2Te 激活的 GaAs 光电阴极，Cs2Te 是一种以其坚固性而闻名的材料。 Cs2Te激活的GaAs形成负电子亲和势，与Cs和O-2激活的GaAs相比，提取电荷的寿命提高了5倍。使用莫特旋光计测量光电子的自旋极化，发现其与激活方法无关，从而改变了采用具有坚固涂层的光电阴极的自旋极化电子源的范例。由 AIP 出版社出版。
Photocathodes capable of providing high intensity and highly spin-polarized electron beams with long operational lifetimes are of great interest for the next generation nuclear physics facilities like Electron Ion Colliders. We report on GaAs photocathodes activated by Cs2Te, a material well known for its robustness. GaAs activated by Cs2Te forms Negative Electron Affinity, and the lifetime for extracted charge is improved by a factor of 5 compared to that of GaAs activated by Cs and O-2. The spin polarization of photoelectrons was measured using a Mott polarimeter and found to be independent from the activation method, thereby shifting the paradigm on spin-polarized electron sources employing photocathodes with robust coatings. Published by AIP Publishing.