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@InProceedings{montgomery:napac2019-moplh11,
author = {E.J. Montgomery and A. Afanasev and C. Jing and R. Kumar and S. Poddar and G.J. Salamo and S. Zhang},
% author = {E.J. Montgomery and A. Afanasev and C. Jing and R. Kumar and S. Poddar and G.J. Salamo and others},
% author = {E.J. Montgomery and others},
title = {{Nanostructured Photocathodes for Spin-Polarized Electron Beams}},
booktitle = {Proc. NAPAC'19},
pages = {196--198},
paper = {MOPLH11},
language = {english},
keywords = {cathode, polarization, lattice, scattering, electron},
venue = {Lansing, MI, USA},
series = {North American Particle Accelerator Conference},
number = {4},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2019},
issn = {2673-7000},
isbn = {978-3-95450-223-3},
doi = {10.18429/JACoW-NAPAC2019-MOPLH11},
url = {http://jacow.org/napac2019/papers/moplh11.pdf},
note = {https://doi.org/10.18429/JACoW-NAPAC2019-MOPLH11},
abstract = {We present progress on incorporation of nanopillar arrays into spin-polarized gallium arsenide photocathodes in pursuit of record high tolerance to ion back-bombardment. Our goal is to exceed the 400 Coulomb record for a high polarization milliampere-class electron source set at Jefferson Laboratory in 2017, while maintaining high quantum efficiency (QE) and spin polarization with a superlattice. Because the Mie effect is resonant, uniformity and careful control over nanostructure geometry is key. We report excellent uniformity and straight sidewall geometry with improved optical absorption using a painstakingly optimized inductively coupled plasma reactive ion etch. We also report the application of Kerker theory to spin-polarized photocathode nanopillar arrays, setting new requirements on nanostructure dimensions to avoid spoiling spin polarization. Finally, we also report initial steps toward re-establishing U.S. production of strained superlattice photocathodes towards integration with nanopillar arrays.},
}