Professional Background

Alex Fairchild is a Postdoctoral Researcher at Lawrence Livermore National Laboratory (LLNL) in the Astrophysics and Advanced Diagnostics Group, where he conducts laboratory astrophysics and atomic physics research using the Electron Beam Ion Trap (EBIT-I). His work utilizes high-resolution EUV and X-ray spectroscopy to produce benchmark measurements that support space-based and laboratory plasma diagnostics. 

Research Interests

• High-resolution EUV and X-ray spectroscopy of highly charged ions
• Laboratory astrophysics and benchmark measurements for plasma diagnostics
• Atomic and condensed matter physics
• Positron–matter interactions and positron annihilation spectroscopy

PhD, Physics, University of Texas at Arlington, 2020

N. Hell, G. V. Brown, M. E. Eckart, A. J. Fairchild, , C. A. Kilbourne, M. A. Leutenegger, F. S.
Porter, and M.C. Witthoeft, “Frequently Used References For Atomic Data In X-ray Spectroscopy”,
arXiv, arXiv:2506.17106, 2025

J. K. Lepson, G. V. Brown, J. H. T. Clementson, A. J. Fairchild, M. F. Gu, N. Hell, E. Tr¨abert,
and P. Beiersdorfer, “Lithium-like O5+ Emission near 19 ˚A”, Atoms, 13, 2025

P. Sau, N. Hancock, I. Parmaksiz, A. J. Fairchild, R. W. Gladen, S. Lotfimarangloo, S. Yadgeer,
A. R. Koymen, A. H. Weiss, and V. A. Chirayath, “Monte Carlo Techniques for Analysis of Positron
Annihilation Spectroscopy of Graphene and Graphite”, Nucl. Instrum. Methods A, Submitted in
2025.

H. Mahdy, V. A. Chirayath, S. Lotfimarangloo, R. W. Gladen, M. Chrysler, A. J. Fairchild, P.
Sau, A. R. Koymen, and A. H. Weiss, “Coincidence Doppler Broadening Spectroscopy of Multilayer
Graphene on Copper Surface Using a Variable Energy Positron Beam”, Solid State Phenom., 374,
47-54, 2025

A. J. Fairchild, N. Hell, P. Beiersdorfer, G. V. Brown, M. E. Eckart, M. Hahn, and D. W. Savin,
“High-Resolution Laboratory Measurements of M-shell Fe EUV Line Emission using EBIT-I”, Eur.
J. Phys. D, 78, 99, 2024.

N. A. Pablant, Z. Cheng, M. O’Mullane, L. Gao, R. Barnsley, M. N. Bartlett, M. Bitter, E.
Bourcart, G. V. Brown, M. De Bock, L. F. Delgado-Aparicio, C. Dunn, A. J. Fairchild, N. Hell,
K. W. Hill, J. Klabacha, F. Kraus, D. Lu, P. B. Magesh, S. Mishra, M. S´anchez del R´ıo, R. Tieulent,
and Y. Yakusevich, “Results from a synthetic model of the ITER XRCS-Core diagnostic based on
high-fidelity x-ray ray tracing”, Rev. Sci. Instrum., 95, 083517, 2024

S. Lotfimarangloo, V. A. Chirayath, S. Mukherjee, H. Akafzade, A. J. Fairchild, R. W. Gladen, A.
R. Koymen, and A. H. Weiss, “Monte Carlo analysis of the contributions of long-lived positronium
to the spectra of positron-impact-induced secondary electrons measured using an annihilation-
gamma-triggered time-of-flight spectrometer”, Nucl. Instrum. Methods B, 542, 99-109, 2023.

 E. Trabert, P. Beiersdorfer, G. V. Brown, N. Hell, J. K. Lepson, A. J. Fairchild, M. Hahn, and
D. W. Savin, “Laboratory Search for Fe IX Solar Diagnostic Lines Using an Electron Beam Ion
Trap”, Atoms, 10, 115, 2022.

A. J. Fairchild, V. A. Chirayath, B. Barbiellini, R. W. Gladen, A. R. Koymen, and A. H. Weiss,
“Photoemission spectroscopy using virtual photons emitted by positron sticking: A complementary
probe for top-layer surface electronic structures”, Phys. Rev. Lett., 129, 106801, 2022.

See Google Scholar for a more complete list.