Title: High power conditioning and benchmarking of planar nitrogen-incorporated ultrananocrystalline diamond field emission electron source

Abstract

Planar nitrogen-incorporated ultrananocrystalline diamond [(N)UNCD] has emerged as a unique field emission source attractive for accelerator applications because of its capability to generate a high charge beam and handle moderate vacuum conditions. Most importantly, (N)UNCD sources are simple to produce: Conventional high aspect ratio isolated emitters are not required to be formed on the surface, and the actual emitter surface roughness is on the order of only 10–100 nm. A careful reliability assessment of (N)UNCD is required before it may find routine application in accelerator systems. In the present study using an L-band normal conducting single-cell rf gun, a (N)UNCD cathode has been conditioned to ~ 42 MV / m in a well-controlled manner. It reached a maximum output charge of 15 nC corresponding to an average current of 6 mA during an emission period of 2.5 $μ$s . Imaging of the emission current revealed a large number of isolated emitters (density over 100/cm² ) distributed on the cathode, which is consistent with previous tests in dc environments. The performance metrics, the emission imaging, and the systematic study of emission properties during rf conditioning in a wide gradient range assert (N)UNCD as an enabling electron source for rf injector designsmore » serving industrial and scientific applications. These studies also improve the fundamental knowledge of the practical conditioning procedure via a better understanding of the emission mechanisms.« less

Authors:

Shao, Jiahang ;

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Schneider, Mitchell ;

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Chen, Gongxiaohui ;

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Nikhar, Tanvi ;

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Kovi, Kiran Kumar; Spentzouris, Linda ;

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Wisniewski, Eric; Power, John; Conde, Manoel; Liu, Wanming; Baryshev, Sergey V.

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• Search DOE PAGES for ORCID "0000-0002-9126-5658"
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Publication Date:

2019-12-11

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials

Sponsoring Org.:

USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

OSTI Identifier:

1579295

Alternate Identifier(s):

OSTI ID: 1616520

Grant/Contract Number:  

AC02-06CH11357; SC0018362; SC0015479; NSF-1739150; NSF-1535676

Resource Type:

Published Article

Journal Name:

Physical Review Accelerators and Beams

Additional Journal Information:

Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 12; Journal ID: ISSN 2469-9888

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS