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

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

Research output: Contribution to journalArticlepeer-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.

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.

FundersFunder number
U.S. Department of Energy
Office of ScienceDE- AC05-00OR22725

    Keywords

    • Charge Exchange Injection
    • Polycrystalline Diamond
    • Spallation neutron source
    • Stripper foil
    • Sublimation

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