Ultrafast laser triggered electron emission from ultrananocrystalline diamond pyramid tip cathode

Kachwala, A.; Chubenko, O.; Kim, Dongsung; Simakov, Evgenya Ivanovna; Karkare, S.

doi:10.1063/5.0196457

Title: Ultrafast laser triggered electron emission from ultrananocrystalline diamond pyramid tip cathode

Journal Article · Wed Mar 27 00:00:00 EDT 2024 · Journal of Applied Physics

DOI: https://doi.org/10.1063/5.0196457 · OSTI ID:2556825

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Arizona State Univ., Tempe, AZ (United States)
Northern Illinois Univ., DeKalb, IL (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Nitrogen-incorporated ultrananocrystalline diamond [(N)UNCD] pyramid tip cathode has been considered as a next-generation high peak current electron source for dielectric laser accelerators as well as other high peak current particle accelerator applications. In this work, we study non-linear photoemission from an (N)UNCD pyramid tip cathode using an ultrafast laser with the pulse length of 150 fs with the central wavelength of 800 nm in the peak intensity range of 10⁹–10¹⁰W/cm². We demonstrated that as the incident laser intensity increases, the current emitted from the nano-tip first increases as a power function with an exponent of about 5 and then starts to roll over to an exponent of 3. This roll over is attributed to the Coulomb interaction between electrons emitted from the tip also known as the space charge. We also measured the photoemission electron energy spectra that show electrons with energies as high as ~10 eV. Based on the shape of the electron energy spectra, we conclude that the high-energy electrons are thermally emitted electrons due to ultrafast laser heating at the tip of the (N)UNCD pyramid tip cathode.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; SC0021092

OSTI ID:: 2556825

Report Number(s):: LA-UR--25-23464

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 135; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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