Rugged spin-polarized electron sources based on negative electron affinity GaAs photocathode with robust Cs2Te coating

被引：48

作者：

Bae, Jai Kwan ^{[1
]}

Cultrera, Luca ^{[1
]}

DiGiacomo, Philip ^{[1
]}

Bazarov, Ivan ^{[1
]}

机构：

[1] Cornell Univ, Cornell Lab Accelerator Based Sci & Educ, Ithaca, NY 14853 USA

来源：

APPLIED PHYSICS LETTERS | 2018年 / 112卷 / 15期

关键词：

PHOTOEMISSION;

D O I：

10.1063/1.5026701

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：5

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