High-Field Brightness Limits of Alkali-Antimonide Photocathodes

Abstract

Pushing the brightness limit of electron sources requires simultaneously minimizing the intrinsic emittance and maximizing the accelerating field. Alkali-antimonide photocathodes exhibit excellent properties at low fields, yet their high-field photoemission physics remains poorly understood owing to acute vacuum sensitivity. Here, we demonstrate robust photoemission from alkali-antimonide photocathodes in a radio-frequency gun at peak fields exceeding 100 MV/m, with quantum efficiency maintained above 1% for more than two weeks, enabling the first systematic measurements of their high-field brightness limits. The measured field dependence of the intrinsic emittance provides direct insight into photoemission physics at high fields. Near-threshold photoemission further reduces the intrinsic emittance, increasing the attainable brightness, and reveals constraints imposed by surface roughness. This work opens the high-field regime for advanced photocathodes, extending the brightness limits of electron sources.

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BibTeX RIS

BibTeX

@misc{huang2026highfield,
  title = {{High-Field Brightness Limits of Alkali-Antimonide Photocathodes}},
  author = {Peng-Wei Huang and Zhiyuan Wang and Xinlong Cao and Zhuoxuan Liu and Lianmin Zheng and Yingchao Du and Wenhui Huang and Chuanxiang Tang and Renkai Li},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.01398},
  eprint = {2610.01398},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.01398},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - High-Field Brightness Limits of Alkali-Antimonide Photocathodes
AU  - Peng-Wei Huang
AU  - Zhiyuan Wang
AU  - Xinlong Cao
AU  - Zhuoxuan Liu
AU  - Lianmin Zheng
AU  - Yingchao Du
AU  - Wenhui Huang
AU  - Chuanxiang Tang
AU  - Renkai Li
PY  - 2026
DA  - 2026/10/02
PB  - arXiv
DO  - 10.48550/arxiv.2610.01398
UR  - https://arxiv.org/abs/2610.01398
AB  - Pushing the brightness limit of electron sources requires simultaneously minimizing the intrinsic emittance and maximizing the accelerating field. Alkali-antimonide photocathodes exhibit excellent properties at low fields, yet their high-field photoemission physics remains poorly understood owing to acute vacuum sensitivity. Here, we demonstrate robust photoemission from alkali-antimonide photocathodes in a radio-frequency gun at peak fields exceeding 100 MV/m, with quantum efficiency maintained above 1% for more than two weeks, enabling the first systematic measurements of their high-field brightness limits. The measured field dependence of the intrinsic emittance provides direct insight into photoemission physics at high fields. Near-threshold photoemission further reduces the intrinsic emittance, increasing the attainable brightness, and reveals constraints imposed by surface roughness. This work opens the high-field regime for advanced photocathodes, extending the brightness limits of electron sources.
ER  -

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