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Title: Angular scattering of protons through ultrathin graphene foils: Application for time-of-flight instrumentation

Abstract

Space plasma instruments often rely on ultrathin carbon foils for incident ion detection, time-of-flight (TOF) mass spectrometry, and ionization of energetic neutral atoms. Angular scattering and energy loss of ions or neutral atoms in the foil can degrade instrument performance, including sensitivity and mass resolution; thus, there is an ongoing effort to manufacture thinner foils. Using new 3-layer graphene foils manufactured at the Los Alamos National Laboratory, we demonstrate that these are the thinnest foils reported to date and discuss future testing required for application in space instrumentation. We characterize the angular scattering distribution for 3–30 keV protons through the foils, which is used as a proxy for the foil thickness. We show that these foils are ~2.5–4.5 times thinner than the state-of-the-art carbon foils and ~1.6 times thinner than other graphene foils described in the literature. We find that the inverse relationship between angular scattering and energy no longer holds, reaffirming that this may indicate a new domain of beam–foil interactions for ultrathin (few-layer) graphene foils.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1616423
Alternate Identifier(s):
OSTI ID: 1602338
Report Number(s):
LA-UR-19-24967
Journal ID: ISSN 0034-6748
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 91; Journal Issue: 3; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Graphene; Mass spectrometry; Microchannel plate detectors; Time-of-flight method; Ion sources; Image processing; Ion scattering

Citation Formats

Vira, Alisha Daya, Fernandes, Philip A., Funsten, Herbert O. III, Morley, Steven Karl, Yamaguchi, Hisato, Liu, Fangze, and Moody, Nathan Andrew. Angular scattering of protons through ultrathin graphene foils: Application for time-of-flight instrumentation. United States: N. p., 2020. Web. doi:10.1063/1.5134768.
Vira, Alisha Daya, Fernandes, Philip A., Funsten, Herbert O. III, Morley, Steven Karl, Yamaguchi, Hisato, Liu, Fangze, & Moody, Nathan Andrew. Angular scattering of protons through ultrathin graphene foils: Application for time-of-flight instrumentation. United States. doi:https://doi.org/10.1063/1.5134768
Vira, Alisha Daya, Fernandes, Philip A., Funsten, Herbert O. III, Morley, Steven Karl, Yamaguchi, Hisato, Liu, Fangze, and Moody, Nathan Andrew. Mon . "Angular scattering of protons through ultrathin graphene foils: Application for time-of-flight instrumentation". United States. doi:https://doi.org/10.1063/1.5134768. https://www.osti.gov/servlets/purl/1616423.
@article{osti_1616423,
title = {Angular scattering of protons through ultrathin graphene foils: Application for time-of-flight instrumentation},
author = {Vira, Alisha Daya and Fernandes, Philip A. and Funsten, Herbert O. III and Morley, Steven Karl and Yamaguchi, Hisato and Liu, Fangze and Moody, Nathan Andrew},
abstractNote = {Space plasma instruments often rely on ultrathin carbon foils for incident ion detection, time-of-flight (TOF) mass spectrometry, and ionization of energetic neutral atoms. Angular scattering and energy loss of ions or neutral atoms in the foil can degrade instrument performance, including sensitivity and mass resolution; thus, there is an ongoing effort to manufacture thinner foils. Using new 3-layer graphene foils manufactured at the Los Alamos National Laboratory, we demonstrate that these are the thinnest foils reported to date and discuss future testing required for application in space instrumentation. We characterize the angular scattering distribution for 3–30 keV protons through the foils, which is used as a proxy for the foil thickness. We show that these foils are ~2.5–4.5 times thinner than the state-of-the-art carbon foils and ~1.6 times thinner than other graphene foils described in the literature. We find that the inverse relationship between angular scattering and energy no longer holds, reaffirming that this may indicate a new domain of beam–foil interactions for ultrathin (few-layer) graphene foils.},
doi = {10.1063/1.5134768},
journal = {Review of Scientific Instruments},
number = 3,
volume = 91,
place = {United States},
year = {2020},
month = {3}
}

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