Experimental investigation on the effect of surface electric field in the growth of tungsten nano-tendril morphology due to low energy helium irradiation

Woller, K. B.; Whyte, D. G.; Wright, G. M.; Brunner, D.

doi:10.1016/j.jnucmat.2016.09.018

Experimental investigation on the effect of surface electric field in the growth of tungsten nano-tendril morphology due to low energy helium irradiation

Journal Article · Mon Sep 19 00:00:00 EDT 2016 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2016.09.018· OSTI ID:1534014

^[1]; Whyte, D. G. ^[2]; Wright, G. M. ^[2]; Brunner, D. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; OSTI
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

The mechanisms responsible for and controlling the growth of tungsten nano-tendrils (or “fuzz”) under low-energy helium plasma exposure remain unclear. For the first time in nano-tendril experiments, the plasma sheath-produced electric field and the helium (He) ion energy have been decoupled, showing that the sheath electric field has little impact on nano-tendril growth, eliminating a possible cause for tendril growth. The well-established necessary growth conditions for W fuzz were maintained with He ion flux density Γ_He > 10²¹ He m^–2 s^–1, surface temperature T_s = 1273 K, He ion energy E_He = 64 eV, and He ion fluence Φ_He > 10²⁴ He m^–2. A grid is situated between the tungsten sample and plasma, with the grid and sample potentials independently controlled in order to control the electric field at the surface of the sample while maintaining the same incident He ion energy to the surface. A calculation of the potential profile in the drift space between the grid and sample was used to account for space charge and calculate the electric field at the surface of the sample. Tungsten fuzz formed at all electric fields tested, even near zero electric field. Also, the depth of the resulting W fuzz layer was unaltered by the electric field when compared to the calculated depth determined from an empirical growth model. The conclusion is that the sheath electric field is not necessary to cause the changes in surface morphology.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)

Grant/Contract Number:: SC0002060

OSTI ID:: 1534014

Alternate ID(s):: OSTI ID: 1434066
OSTI ID: 22648424

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 481; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (28)

Retarding Field Energy Analysis for Ion Temperature Measurement in the Tokamak Edge Pitts, R. A. Contributions to Plasma Physics, Vol. 36, Issue S1 https://doi.org/10.1002/ctpp.19960360114	journal	January 1996
The effects of high fluence mixed-species (deuterium, helium, beryllium) plasma interactions with tungsten Baldwin, M. J.; Doerner, R. P.; Nishijima, D. Journal of Nuclear Materials, Vol. 390-391 https://doi.org/10.1016/j.jnucmat.2009.01.247	journal	June 2009
Nanostructure formation on tungsten exposed to low-pressure rf helium plasmas: A study of ion energy threshold and early stage growth Baldwin, M. J.; Lynch, T. C.; Doerner, R. P. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2010.10.050	journal	August 2011
TEM observation of the growth process of helium nanobubbles on tungsten: Nanostructure formation mechanism Kajita, Shin; Yoshida, Naoaki; Yoshihara, Reiko Journal of Nuclear Materials, Vol. 418, Issue 1-3 https://doi.org/10.1016/j.jnucmat.2011.06.026	journal	November 2011
Comparison of tungsten nano-tendrils grown in Alcator C-Mod and linear plasma devices Wright, G. M.; Brunner, D.; Baldwin, M. J. Journal of Nuclear Materials, Vol. 438 https://doi.org/10.1016/j.jnucmat.2013.01.013	journal	July 2013
Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure Woller, K. B.; Whyte, D. G.; Wright, G. M. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.11.126	journal	August 2015
Quantitative Analysis of Gold Nanorod Alignment after Electric Field-Assisted Deposition Ahmed, Waqqar; Kooij, E. Stefan; van Silfhout, Arend Nano Letters, Vol. 9, Issue 11 https://doi.org/10.1021/nl901968e	journal	November 2009
The epitaxial growth of microprotrusions on field emitter tips Schwoebel, P. R. Journal of Applied Physics, Vol. 64, Issue 5 https://doi.org/10.1063/1.341666	journal	September 1988
Macroscopic variations of surface potentials of conductors Camp, J. B.; Darling, T. W.; Brown, Ronald E. Journal of Applied Physics, Vol. 69, Issue 10 https://doi.org/10.1063/1.347601	journal	May 1991
Nucleation of metals by strong electric fields Nardone, M.; Karpov, V. G. Applied Physics Letters, Vol. 100, Issue 15 https://doi.org/10.1063/1.3703611	journal	April 2012
An experiment on the dynamics of ion implantation and sputtering of surfaces Wright, G. M.; Barnard, H. A.; Kesler, L. A. Review of Scientific Instruments, Vol. 85, Issue 2 https://doi.org/10.1063/1.4861917	journal	February 2014
Helium induced nanoscopic morphology on tungsten under fusion relevant plasma conditions Baldwin, M. J.; Doerner, R. P. Nuclear Fusion, Vol. 48, Issue 3 https://doi.org/10.1088/0029-5515/48/3/035001	journal	January 2008
Formation process of tungsten nanostructure by the exposure to helium plasma under fusion relevant plasma conditions Kajita, Shin; Sakaguchi, Wataru; Ohno, Noriyasu Nuclear Fusion, Vol. 49, Issue 9 https://doi.org/10.1088/0029-5515/49/9/095005	journal	August 2009
Tungsten nano-tendril growth in the Alcator C-Mod divertor Wright, G. M.; Brunner, D.; Baldwin, M. J. Nuclear Fusion, Vol. 52, Issue 4 https://doi.org/10.1088/0029-5515/52/4/042003	journal	March 2012
Viscoelastic model of tungsten ‘fuzz’ growth Krasheninnikov, S. I. Physica Scripta, Vol. T145 https://doi.org/10.1088/0031-8949/2011/T145/014040	journal	December 2011
He-ion and self-atom induced damage and surface-morphology changes of a hot W target Meyer, F. W.; Hijazi, H.; Bannister, M. E. Physica Scripta, Vol. T159 https://doi.org/10.1088/0031-8949/2014/T159/014029	journal	April 2014
Growth of multifractal tungsten nanostructure by He bubble induced directional swelling Kajita, Shin; Yoshida, Naoaki; Ohno, Noriyasu New Journal of Physics, Vol. 17, Issue 4 https://doi.org/10.1088/1367-2630/17/4/043038	journal	April 2015
Determination of the Surface Tension and Surface Migration Constants for Tungsten Barbour, J. P.; Charbonnier, F. M.; Dolan, W. W. Physical Review, Vol. 117, Issue 6 https://doi.org/10.1103/PhysRev.117.1452	journal	March 1960
Activation Energy for the Surface Migration of Tungsten in the Presence of a High-Electric Field Bettler, Philip C.; Charbonnier, Francis M. Physical Review, Vol. 119, Issue 1 https://doi.org/10.1103/PhysRev.119.85	journal	July 1960
On the Currents Carried by Electrons of Uniform Initial Velocity Jaffé, George Physical Review, Vol. 65, Issue 3-4 https://doi.org/10.1103/PhysRev.65.91	journal	February 1944
Electrostatic Theory of Metal Whiskers Karpov, V. G. Physical Review Applied, Vol. 1, Issue 4 https://doi.org/10.1103/PhysRevApplied.1.044001	journal	May 2014
Annotated tin whisker bibliography and anthology Galyon, G. T. IEEE Transactions on Electronics Packaging Manufacturing, Vol. 28, Issue 1 https://doi.org/10.1109/TEPM.2005.847440	journal	January 2005
Nanostructuring of molybdenum and tungsten surfaces by low-energy helium ions De Temmerman, Gregory; Bystrov, Kirill; Zielinski, Jakub J. Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 30, Issue 4 https://doi.org/10.1116/1.4731196	journal	July 2012
Growth and Properties of "Whiskers": Further research is needed to show why crystal filaments are many times as strong as large crystals Brenner, S. S. Science, Vol. 128, Issue 3324 https://doi.org/10.1126/science.128.3324.569	journal	September 1958
Loop punching and bubble rupture causing surface roughening —A model for W fuzz growth Lasa, A.; Tähtinen, S. K.; Nordlund, K. EPL (Europhysics Letters), Vol. 105, Issue 2 https://doi.org/10.1209/0295-5075/105/25002	journal	January 2014
Formation of Nanostructured Tungsten with Arborescent Shape due to Helium Plasma Irradiation Takamura, Shuichi; Ohno, Noriyasu; Nishijima, Dai Plasma and Fusion Research, Vol. 1 https://doi.org/10.1585/pfr.1.051	journal	January 2006
Formation Condition of Fiberform Nanostructured Tungsten by Helium Plasma Exposure Sakaguchi, Wataru; Kajita, Shin; Ohno, Noriyasu Plasma and Fusion Research, Vol. 5 https://doi.org/10.1585/pfr.5.S1023	journal	January 2010
Near Infrared Radiation from Heated Nanostructured Tungsten Kajita, Shin; Yokochi, Takanori; Ohno, Noriyasu Japanese Journal of Applied Physics, Vol. 51, Issue 1S https://doi.org/10.7567/JJAP.51.01AJ03	journal	January 2012

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