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Title: Energy loss of 1-50 keV H, He, C, N, O, Ne, and Ar ions transmitted through thin carbon foils

Abstract

Thin foils are used extensively in space plasma spectrometers, for example, for generation of a coincidence measurement via secondary electron emission in time-of-flight mass spectrometers and charge conversion of energetic neutral atoms (ENAs) in ENA imagers. An ion or neutral atom passing through the carbon foil experiences energy loss and straggling that can degrade the energy resolution or mass resolution. These effects need to be quantified in order to permit efficient instrument development and modeling. We present measurements of energy loss and energy loss straggling for H, He, C, N, O, Ne, and Ar ions between 1 and 50 keV passing through carbon foils of different thicknesses (nominally between 0.5 and 3.0 {mu}g/cm{sup 2}). We derive empirical relationships for the energy loss and energy loss straggling as a function of foil thickness, ion species, and ion energy. In particular, below {approx}10 keV the energy loss of hydrogen seems to vary with foil thickness and the energy loss straggling seems to vary with the square root of the thickness. Our results apply equally well to ions and neutral atoms.

Authors:
; ; ; ; ; ; ; ;  [1];  [2];  [3]
  1. Southwest Research Institute, San Antonio, Texas 78228-0510 (United States)
  2. (CETP), 94100 Saint-Maur (France)
  3. (United States)
Publication Date:
OSTI Identifier:
20779206
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 77; Journal Issue: 4; Other Information: DOI: 10.1063/1.2185490; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ARGON; ARGON IONS; ATOMS; CARBON; ELECTRON EMISSION; ENERGY RESOLUTION; FOILS; HELIUM; HYDROGEN; KEV RANGE 10-100; MASS RESOLUTION; NEON; NITROGEN; OXYGEN; THICKNESS; TIME-OF-FLIGHT MASS SPECTROMETERS

Citation Formats

Allegrini, F., McComas, D.J., Young, D.T., Berthelier, J.-J., Covinhes, J., Illiano, J.-M., Riou, J.-F., Funsten, H.O., Harper, R.W., Centre D'Etude Terrestre et Planetaire, and Los Alamos National Laboratory, Los Alamos, New Mexico 87545. Energy loss of 1-50 keV H, He, C, N, O, Ne, and Ar ions transmitted through thin carbon foils. United States: N. p., 2006. Web. doi:10.1063/1.2185490.
Allegrini, F., McComas, D.J., Young, D.T., Berthelier, J.-J., Covinhes, J., Illiano, J.-M., Riou, J.-F., Funsten, H.O., Harper, R.W., Centre D'Etude Terrestre et Planetaire, & Los Alamos National Laboratory, Los Alamos, New Mexico 87545. Energy loss of 1-50 keV H, He, C, N, O, Ne, and Ar ions transmitted through thin carbon foils. United States. doi:10.1063/1.2185490.
Allegrini, F., McComas, D.J., Young, D.T., Berthelier, J.-J., Covinhes, J., Illiano, J.-M., Riou, J.-F., Funsten, H.O., Harper, R.W., Centre D'Etude Terrestre et Planetaire, and Los Alamos National Laboratory, Los Alamos, New Mexico 87545. Sat . "Energy loss of 1-50 keV H, He, C, N, O, Ne, and Ar ions transmitted through thin carbon foils". United States. doi:10.1063/1.2185490.
@article{osti_20779206,
title = {Energy loss of 1-50 keV H, He, C, N, O, Ne, and Ar ions transmitted through thin carbon foils},
author = {Allegrini, F. and McComas, D.J. and Young, D.T. and Berthelier, J.-J. and Covinhes, J. and Illiano, J.-M. and Riou, J.-F. and Funsten, H.O. and Harper, R.W. and Centre D'Etude Terrestre et Planetaire and Los Alamos National Laboratory, Los Alamos, New Mexico 87545},
abstractNote = {Thin foils are used extensively in space plasma spectrometers, for example, for generation of a coincidence measurement via secondary electron emission in time-of-flight mass spectrometers and charge conversion of energetic neutral atoms (ENAs) in ENA imagers. An ion or neutral atom passing through the carbon foil experiences energy loss and straggling that can degrade the energy resolution or mass resolution. These effects need to be quantified in order to permit efficient instrument development and modeling. We present measurements of energy loss and energy loss straggling for H, He, C, N, O, Ne, and Ar ions between 1 and 50 keV passing through carbon foils of different thicknesses (nominally between 0.5 and 3.0 {mu}g/cm{sup 2}). We derive empirical relationships for the energy loss and energy loss straggling as a function of foil thickness, ion species, and ion energy. In particular, below {approx}10 keV the energy loss of hydrogen seems to vary with foil thickness and the energy loss straggling seems to vary with the square root of the thickness. Our results apply equally well to ions and neutral atoms.},
doi = {10.1063/1.2185490},
journal = {Review of Scientific Instruments},
number = 4,
volume = 77,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}