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Part 1: Document Description
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Citation |
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Title: |
Impact of Helium Ion Energy Modulation on Tungsten Surface Morphology and Nano-Tendril Growth |
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Identification Number: |
doi:10.7910/DVN/E7WWGM |
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Distributor: |
Harvard Dataverse |
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Date of Distribution: |
2018-10-18 |
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Version: |
1 |
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Bibliographic Citation: |
Kevin Woller, Dennis Whyte, Graham Wright, 2018, "Impact of Helium Ion Energy Modulation on Tungsten Surface Morphology and Nano-Tendril Growth", https://doi.org/10.7910/DVN/E7WWGM, Harvard Dataverse, V1, UNF:6:4OxDafFNq5iFGG7SlvmtRA== [fileUNF] |
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Citation |
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Title: |
Impact of Helium Ion Energy Modulation on Tungsten Surface Morphology and Nano-Tendril Growth |
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Identification Number: |
doi:10.7910/DVN/E7WWGM |
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Authoring Entity: |
Kevin Woller, Dennis Whyte, Graham Wright |
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Distributor: |
Harvard Dataverse |
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Holdings Information: |
https://doi.org/10.7910/DVN/E7WWGM |
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Study Scope |
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Keywords: |
Physics, helium, nano-tendril, plasma material interactionS, radiofrequency sheath, Tungsten fuzz |
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Abstract: |
Time-modulated helium (He) ion energy (e.g. V_Bias = -50 + 25*sin(2*pi*f_RF*t), f_RF = 13.56 MHz) is demonstrated to strongly affect the development of tungsten (W) surface morphology that results from He plasma irradiation in the DIONISOS linear plasma experiment. Nano-tendril bundles (NTBs), which appear as isolated “islands” of nano-tendrils, can rapidly grow on an otherwise smooth W surface. This is in contrast to previously seen full-surface coverage of nano-tendril growth known as “fuzz”. When tall NTBs form, less than 15% of the surface contains nano-tendrils. The NTB surface coverage changes with growth conditions and the total volume of nano-tendrils in the NTBs is observed to be up to a factor of 16 larger than when fuzz is grown. This indicates that long-range W surface transport underlies nano-tendril formation. Surface temperature 870–1220 K, the DC bias potential -30 to -70 V, and the ion flux density 4.4x10^21–1.1x10^22 He*m^-2*s^-1 are varied in the experiments. NTBs form at similar conditions as fuzz with the critical difference being the RF modulation of the ion energy bombarding the W, another indication of the importance of W surface transport. Mass loss measurements indicate net erosion with a yield of 1–8x10^-4 W/He when NTBs form; erosion that is not attributable to chemical or physical sputtering by He or impurities in the plasma. The erosion is correlated to the NTB growth, based on post-exposure inspection by electron microscopy indicating that NTBs are prone to loss from the surface. NTB growth is compared to the empirical growth-erosion model of fuzz, showing NTBs grow up to a factor of 100 times taller than the expected fuzz layer depth under DC bias conditions. Insights into nano-tendril growth provided by this new growth regime are discussed. Strategies to mitigate W fuzz growth may inadvertently result in rapid localized nano-tendril bundle growth with a higher probability of dust production. |
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Notes: |
<a href="http://library.psfc.mit.edu/catalog/reports/2010/16ja/16ja028/16ja028_abs.html">PSFC REPORT PSFC/JA-16-28</a><br /><br />This work is supported by US DOE awards DE-SC00-02060 and DE-FC02-99ER54512. This work made use of the MRSEC Shared Experimental Facilities at MIT, supported by the National Science Foundation under award number DMR-08-19762. |
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Methodology and Processing |
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Sources Statement |
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Data Access |
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Notes: |
This dataset is made available without information on how it can be used. You should communicate with the Contact(s) specified before use. |
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Other Study Description Materials |
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File Description--f3241872 |
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File: 16ja028_fig02_data.tab |
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