Demonstration of nitrogen-incorporated ultrananocrystalline diamond photocathodes in a RF gun environment

Chen, Gongxiaohui; Spentzouris, Linda; Jing, Chunguang; Conde, Manoel; Ha, Gwanghui; Liu, Wanming; Power, John; Wisniewski, Eric; Sumant, Anirudha V.; Antipov, Sergey; Gomez, Edgar; Kovi, Kiran Kumar; Shao, Jiahang

doi:10.1063/5.0029512

Title: Demonstration of nitrogen-incorporated ultrananocrystalline diamond photocathodes in a RF gun environment

Journal Article · Tue Oct 27 00:00:00 EDT 2020 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0029512· OSTI ID:1765464

Chen, Gongxiaohui ^[1]; Spentzouris, Linda ^[1]; Jing, Chunguang ^[2]; Conde, Manoel ^[3];

^[3]; Liu, Wanming ^[3]; Power, John ^[3];

^[3];

^[4]; Antipov, Sergey ^[2]; Gomez, Edgar ^[2];

^[2];

^[3]

Illinois Institute of Technology, Chicago, IL (United States)
Euclid TechLabs LLC, Bolingbrook, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States). Center for Nanoscale Materials

Quantum efficiency (QE), intrinsic emittance, and robustness are the three most important figures of merit for photocathodes, the first two determine the ultimate achievable brightness of an electron beam, and the third one directly correlates with the complications of a beamline design. Nitrogen-incorporated ultrananocrystalline diamond [(N)UNCD] materials are promising candidates for photocathode applications due to their remarkable electron emission performance as well as the moderate vacuum requirement. Two (N)UNCD photocathodes have been characterized in a realistic RF gun environment with the nicely balanced performance of all three figures of merit. In this work, the QE of the first (N)UNCD cathode (stored in air for two years before the test) was found to be 3.8 x 10^–4 using a 262 nm UV laser and a cathode surface field of 30MV/m. It was found that the QE of the second (N)UNCD sample (grown days before the test) was nearly the same and, therefore, demonstrates the exceptional environmental tolerance of the material. The intrinsic emittance of (N)UNCD was measured to be 1.00 μm/mm.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Engineering & Technology. Office of Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) Programs

Grant/Contract Number:: AC02-06CH11357; PHY-1403952; SC0015479; SC0013145

OSTI ID:: 1765464

Alternate ID(s):: OSTI ID: 1690301

Journal Information:: Applied Physics Letters, Vol. 117, Issue 17; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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