Secondary electron emission yield (SEY) in amorphous and graphitic carbon films prepared by PLD

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Abstract

High secondary emission yield (SEY), and the subsequent build-up of a secondary electron cloud, may severely limit the stability of high-intensity particle beams inside particle accelerators. One of the best candidates of beam pipe coating for reduced SEY has been amorphous carbon (a-C) produced by direct current (D.C.) magnetron sputtering. Here we used pulsed laser deposition (PLD), to prepare a-C films from a pure carbon target at substrate temperatures ranging from 300 K to 773 K. The ablating laser was a Nd:YAG system operating at 1064 nm wavelength. With increasing temperature the optical band gap dropped from about 2.1 eV to 1.0 eV. This trend indicates transition from predominantly a-C films to films with more graphitic content, which was also confirmed by Raman measurements. SEY spectra were taken upto 1732 eV of primary electron energy. The maximum SEY value decreased from 1.9 in a-C films down to 1.4 in highly graphitic films deposited at higher temperatures.
Original languageUnknown
Pages (from-to)1501-1503
JournalPhysica Status Solidi (C) Current Topics In Solid State Physics
Volume9
Issue number6
DOIs
Publication statusPublished - 1 Jan 2012

Cite this

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title = "Secondary electron emission yield (SEY) in amorphous and graphitic carbon films prepared by PLD",
abstract = "High secondary emission yield (SEY), and the subsequent build-up of a secondary electron cloud, may severely limit the stability of high-intensity particle beams inside particle accelerators. One of the best candidates of beam pipe coating for reduced SEY has been amorphous carbon (a-C) produced by direct current (D.C.) magnetron sputtering. Here we used pulsed laser deposition (PLD), to prepare a-C films from a pure carbon target at substrate temperatures ranging from 300 K to 773 K. The ablating laser was a Nd:YAG system operating at 1064 nm wavelength. With increasing temperature the optical band gap dropped from about 2.1 eV to 1.0 eV. This trend indicates transition from predominantly a-C films to films with more graphitic content, which was also confirmed by Raman measurements. SEY spectra were taken upto 1732 eV of primary electron energy. The maximum SEY value decreased from 1.9 in a-C films down to 1.4 in highly graphitic films deposited at higher temperatures.",
author = "Teodoro, {Orlando Manuel Neves Duarte}",
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doi = "10.1002/pssc.201100813",
language = "Unknown",
volume = "9",
pages = "1501--1503",
journal = "Physica Status Solidi (C) Current Topics In Solid State Physics",
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TY - JOUR

T1 - Secondary electron emission yield (SEY) in amorphous and graphitic carbon films prepared by PLD

AU - Teodoro, Orlando Manuel Neves Duarte

N1 - Sem PDF conforme despacho. O docente informou que não tem a versão submetida.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - High secondary emission yield (SEY), and the subsequent build-up of a secondary electron cloud, may severely limit the stability of high-intensity particle beams inside particle accelerators. One of the best candidates of beam pipe coating for reduced SEY has been amorphous carbon (a-C) produced by direct current (D.C.) magnetron sputtering. Here we used pulsed laser deposition (PLD), to prepare a-C films from a pure carbon target at substrate temperatures ranging from 300 K to 773 K. The ablating laser was a Nd:YAG system operating at 1064 nm wavelength. With increasing temperature the optical band gap dropped from about 2.1 eV to 1.0 eV. This trend indicates transition from predominantly a-C films to films with more graphitic content, which was also confirmed by Raman measurements. SEY spectra were taken upto 1732 eV of primary electron energy. The maximum SEY value decreased from 1.9 in a-C films down to 1.4 in highly graphitic films deposited at higher temperatures.

AB - High secondary emission yield (SEY), and the subsequent build-up of a secondary electron cloud, may severely limit the stability of high-intensity particle beams inside particle accelerators. One of the best candidates of beam pipe coating for reduced SEY has been amorphous carbon (a-C) produced by direct current (D.C.) magnetron sputtering. Here we used pulsed laser deposition (PLD), to prepare a-C films from a pure carbon target at substrate temperatures ranging from 300 K to 773 K. The ablating laser was a Nd:YAG system operating at 1064 nm wavelength. With increasing temperature the optical band gap dropped from about 2.1 eV to 1.0 eV. This trend indicates transition from predominantly a-C films to films with more graphitic content, which was also confirmed by Raman measurements. SEY spectra were taken upto 1732 eV of primary electron energy. The maximum SEY value decreased from 1.9 in a-C films down to 1.4 in highly graphitic films deposited at higher temperatures.

U2 - 10.1002/pssc.201100813

DO - 10.1002/pssc.201100813

M3 - Article

VL - 9

SP - 1501

EP - 1503

JO - Physica Status Solidi (C) Current Topics In Solid State Physics

JF - Physica Status Solidi (C) Current Topics In Solid State Physics

SN - 1862-6351

IS - 6

ER -