Determination of electron beam energy in measuring the electron-impact ionization cross section of He-like Fe24+

Published

March 17, 2023

Author(s)

Yuri Ralchenko, Galen O'Neil, Paul Szypryt, Joseph N. Tan, Aung S. Naing, Yang Yang, Dipti Dipti, Amy Gall, Adam Hosier, David Schultz, Randall Smith, Nancy Brickhouse, Endre Takacs

Abstract

In an effort to measure electron-impact ionization (EII) cross sections of He-like $Fe^24+}$ at the electron beam ion trap (EBIT) facility of the National Institute of Standards and Technology (NIST), we have experimentally determined the corrections to the nominal beam energy of the EBIT. High-resolution x-ray spectra were recorded at nominal electron beam energies between 6600 eV and 18000 eV using x-ray microcalorimetry based upon an array of 192 transition-edge sensors (TES). A large-scale collisional-radiative simulation of the non-Maxwellian EBIT plasma using relevant atomic data calculated with Flexible Atomic Code allowed us to determine both the electron beam space charge (and consequently the actual beam energy) and the ionization cross sections. In this paper, we focus on the method for obtaining an accurate determination of the electron beam energy.

Citation

Atoms

Volume

11

Issue

3

Pub Type

Journals

Download Paper

https://doi.org/10.3390/atoms11030044

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Keywords

EBIT, beam energy, ionization cross section, space charge correction, neutralization

Citation

Ralchenko, Y. , O'Neil, G. , Szypryt, P. , Tan, J. , Naing, A. , Yang, Y. , Dipti, D. , Gall, A. , Hosier, A. , Schultz, D. , Smith, R. , Brickhouse, N. and Takacs, E. (2023), Determination of electron beam energy in measuring the electron-impact ionization cross section of He-like Fe24+, Atoms, [online], https://doi.org/10.3390/atoms11030044, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=936027 (Accessed October 20, 2025)