Comparison of micro- and nanocrystalline diamond films for charge exchange injection

Leo Saturday; Leslie Wilson; Philip D. Rack; Nicholas J. Evans

doi:10.1016/j.nima.2022.167173

Comparison of micro- and nanocrystalline diamond films for charge exchange injection

Leo Saturday, Leslie Wilson, Philip D. Rack, Nicholas J. Evans

Nanofabrication Research Laboratory

Research output: Contribution to journal › Article › peer-review

Abstract

Carbon foils are regularly used for charge exchange injection in beamline accelerators. As beamlines increase the beam power, the thermal durability and longevity of the stripper foils become critically important to maintaining longer beamline operating times. In this study we examine the current Spallation Neutron Source nanocrystalline diamond stripper foils and compare them to microcrystalline alternatives. To do this, an electron beam mimic is used to emulate the power dissipation and thermal load of the SNS beam on the test stripper foils. The tested foils are analyzed based on the resultant temperature of the film and the fraction of electron beam collected by the Faraday cup during beam exposure. Additionally, postmortem testing was conducted to determine the emissivity, vibrational structure via Raman spectroscopy, and surface morphology of the foils.

Original language	English
Article number	167173
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	1039
DOIs	https://doi.org/10.1016/j.nima.2022.167173
State	Published - Sep 11 2022

Funding

This work was supported by the DOE office of Science User Facilities . LS, LW, and NE are supported through funding for the Spallation Neutron Source . SNS is managed by UT-Battelle, LLC , under contract DE- AC05-00OR22725 for the U.S. Department of Energy. Foil synthesis, certain post-mortem testing, and modeling were conducted at the Center for Nanophase Materials Sciences, which is also a DOE Office of Science User Facility.

Funders	Funder number
U.S. Department of Energy
Office of Science	DE- AC05-00OR22725

Keywords

Charge Exchange Injection
Polycrystalline Diamond
Spallation neutron source
Stripper foil
Sublimation

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10.1016/j.nima.2022.167173

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title = "Comparison of micro- and nanocrystalline diamond films for charge exchange injection",

abstract = "Carbon foils are regularly used for charge exchange injection in beamline accelerators. As beamlines increase the beam power, the thermal durability and longevity of the stripper foils become critically important to maintaining longer beamline operating times. In this study we examine the current Spallation Neutron Source nanocrystalline diamond stripper foils and compare them to microcrystalline alternatives. To do this, an electron beam mimic is used to emulate the power dissipation and thermal load of the SNS beam on the test stripper foils. The tested foils are analyzed based on the resultant temperature of the film and the fraction of electron beam collected by the Faraday cup during beam exposure. Additionally, postmortem testing was conducted to determine the emissivity, vibrational structure via Raman spectroscopy, and surface morphology of the foils.",

keywords = "Charge Exchange Injection, Polycrystalline Diamond, Spallation neutron source, Stripper foil, Sublimation",

author = "Leo Saturday and Leslie Wilson and Rack, {Philip D.} and Evans, {Nicholas J.}",

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Comparison of micro- and nanocrystalline diamond films for charge exchange injection. / Saturday, Leo; Wilson, Leslie; Rack, Philip D. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1039, 167173, 11.09.2022.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Comparison of micro- and nanocrystalline diamond films for charge exchange injection

AU - Saturday, Leo

AU - Wilson, Leslie

AU - Rack, Philip D.

AU - Evans, Nicholas J.

PY - 2022/9/11

Y1 - 2022/9/11

N2 - Carbon foils are regularly used for charge exchange injection in beamline accelerators. As beamlines increase the beam power, the thermal durability and longevity of the stripper foils become critically important to maintaining longer beamline operating times. In this study we examine the current Spallation Neutron Source nanocrystalline diamond stripper foils and compare them to microcrystalline alternatives. To do this, an electron beam mimic is used to emulate the power dissipation and thermal load of the SNS beam on the test stripper foils. The tested foils are analyzed based on the resultant temperature of the film and the fraction of electron beam collected by the Faraday cup during beam exposure. Additionally, postmortem testing was conducted to determine the emissivity, vibrational structure via Raman spectroscopy, and surface morphology of the foils.

AB - Carbon foils are regularly used for charge exchange injection in beamline accelerators. As beamlines increase the beam power, the thermal durability and longevity of the stripper foils become critically important to maintaining longer beamline operating times. In this study we examine the current Spallation Neutron Source nanocrystalline diamond stripper foils and compare them to microcrystalline alternatives. To do this, an electron beam mimic is used to emulate the power dissipation and thermal load of the SNS beam on the test stripper foils. The tested foils are analyzed based on the resultant temperature of the film and the fraction of electron beam collected by the Faraday cup during beam exposure. Additionally, postmortem testing was conducted to determine the emissivity, vibrational structure via Raman spectroscopy, and surface morphology of the foils.

KW - Charge Exchange Injection

KW - Polycrystalline Diamond

KW - Spallation neutron source

KW - Stripper foil

KW - Sublimation

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DO - 10.1016/j.nima.2022.167173

M3 - Article

AN - SCOPUS:85135189873

SN - 0168-9002

VL - 1039

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

M1 - 167173

ER -

Comparison of micro- and nanocrystalline diamond films for charge exchange injection

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Keywords

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