Experimental Reconstruction of Source 4D Phase Space Without Prior Knowledge of Transfer Matrix

Charles Zhang; Elena Echeverria; Abigail Flint; William H Li; Christopher M. Pierce; Alice Galdi; Chad Pennington; Adam Bartnik; Ivan Bazarov; Jared Maxson

Experimental Reconstruction of Source 4D Phase Space Without Prior Knowledge of Transfer Matrix

Accelerator Physics 2025-10-16 v3

Authors: Charles Zhang , Elena Echeverria , Abigail Flint , William H Li , Christopher M. Pierce , Alice Galdi , Chad Pennington , Adam Bartnik , Ivan Bazarov , Jared Maxson

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Abstract

We experimentally demonstrate a method for reconstructing the transverse 4D phase space of an electron beam at the time of emission from downstream diagnostics of the 4D phase space. This method does not rely on detailed knowledge of the beamline transport, besides assuming that linearity and symplecticity are satisfied. We apply this method to measure the transverse position and momentum phase space of electrons emitted from a spatially-structured alkali-antimonide cathode. This method can uncover local correlations between emission location and momentum spread. We formulate this method analytically and investigate resolution limits.

Keywords

phase space reconstruction electron beam symplectic optics 4D phase space beam diagnostics

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@article{arxiv.2510.04768,
  title  = {Experimental Reconstruction of Source 4D Phase Space Without Prior Knowledge of Transfer Matrix},
  author = {Charles Zhang and Elena Echeverria and Abigail Flint and William H Li and Christopher M. Pierce and Alice Galdi and Chad Pennington and Adam Bartnik and Ivan Bazarov and Jared Maxson},
  journal= {arXiv preprint arXiv:2510.04768},
  year   = {2025}
}

Experimental Reconstruction of Source 4D Phase Space Without Prior Knowledge of Transfer Matrix

Abstract

Keywords

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