Nanocrystalline diamond coating of fusion plasma facing components

Porro, Samuele; Temmerman, G. De; Lisgo, S.; John, P.; Villalpando, Isaela; Zimmer, J.; Johnson, Bob; Wilson, J.I.B.

doi:10.1016/j.diamond.2009.01.006

Cited by 33 publications

(13 citation statements)

References 21 publications

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“…Because of outstanding mechanical and thermal properties, diamond is also envisaged as a divertor material. Its behavior under highdensity plasma exposure has been studied, whether in tokamaks or in high-flux experiments specially designed for plasma-surface interaction investigations 32,33,34,35,36,37,38,39 . Negative ion production on materials can affect the heat load received by the divertor through the H -/H + reaction of neutralization and consequent radiation 40 .…”

Section: Introductionmentioning

confidence: 99%

Negative-ion production on carbon materials in hydrogen plasma: influence of the carbon hybridization state and the hydrogen content on H⁻yield

Ahmad¹,

Pardanaud²,

Carrère³

et al. 2014

J. Phys. D: Appl. Phys.

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Highly oriented poly crystalline graphite (HOPG), boron-doped diamond (BDD), nanocrystalline diamond (NCD), ultra-nano-crystalline diamond (uNCD), fullerenes C60 and C70 and Diamond Like Carbon (DLC) surfaces are exposed to low pressure hydrogen plasma in a 13.56 MHz plasma reactor. Relative yields of surface produced Hions due to bombardment of positive ions from the plasma are measured by an energy analyzer cum quadrupole mass spectrometer. Irrespective of plasma conditions (0.2 and 2 Pa), HOPG surfaces show the highest yield at room temperature (RT), while at high temperature (HT), the highest yield (~ 5 times compared to HOPG surface at room temperature) is observed on BDD surfaces. The shapes of ion distribution functions (IDFs) are compared at RT and HT to demonstrate the mechanism of ion generation at the surface. Raman spectroscopy analyses of the plasma exposed samples reveal surface modifications influencing Hproduction yields, while further analyses strongly suggest that the hydrogen content of the material and the sp3/sp2 ratio are the key parameters in driving surface ionization efficiency of carbon materials under the chosen plasma conditions.

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Section: Introductionmentioning

confidence: 99%

Negative-ion production on carbon materials in hydrogen plasma: influence of the carbon hybridization state and the hydrogen content on H⁻yield

Ahmad¹,

Pardanaud²,

Carrère³

et al. 2014

J. Phys. D: Appl. Phys.

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“…The increase in surface roughness was primarily attributed to the chemical pretreatment processes prior to diamond deposition [14]. However, this did not adversely affect the quality of tubes drawn through the NCD coated drawing dies and, in fact, the tubes drawn through the NCD coated dies were smoother when compared to their counterparts drawn through a regular WC-Co die, even though the die surface Fig.…”

Section: Surface Roughness Of Tubesmentioning

confidence: 89%

Nanocrystalline diamond coatings on the interior of WC–Co dies for drawing carbon steel tubes: Enhancement of tube properties

Chandran

Kumaran

Dumpala

et al. 2014

Diamond and Related Materials

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“…The substrate temperature was ∼600 °C. Further details of the UNCD film deposition process were reported elsewhere .…”

Section: Methodsmentioning

confidence: 99%

Characterization of the surface acoustic wave devices based on ZnO/nanocrystalline diamond structures

Pang

Garcia‐Gancedo

et al. 2013

Phys. Status Solidi A

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Nanocrystalline ZnO films with strong (0002) texture and fine grains were deposited onto ultra-nanocrystalline diamond (UNCD) layers on silicon using high target utilization sputtering technology. The unique characteristic of this sputtering technique allows room temperature growth of smooth ZnO films with a low roughness and low stress at high growth rates. Surface acoustic wave (SAW) devices were fabricated on ZnO/UNCD structure and exhibited good transmission signals with a low insertion loss and a strong side-lobe suppression for the Rayleigh mode SAW. Based on the optimization of the layered structure of the SAW device, a good performance with a coupling coefficient of 5.2% has been realized, promising for improving the microfluidic efficiency in droplet transportation comparing with that of the ZnO/Si SAW device. An optimized temperature coefficient of frequency of À23.4 ppm 8C À1 was obtained for the SAW devices with the 2.72 mm-thick ZnO and 1.1 mm-thick UNCD film. Significant thermal effect due to the acoustic heating has been redcued which is related to the temperature stability of the ZnO/UNCD SAW device.

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Nanocrystalline diamond coating of fusion plasma facing components

Cited by 33 publications

References 21 publications

Negative-ion production on carbon materials in hydrogen plasma: influence of the carbon hybridization state and the hydrogen content on H⁻yield

Negative-ion production on carbon materials in hydrogen plasma: influence of the carbon hybridization state and the hydrogen content on H⁻yield

Nanocrystalline diamond coatings on the interior of WC–Co dies for drawing carbon steel tubes: Enhancement of tube properties

Characterization of the surface acoustic wave devices based on ZnO/nanocrystalline diamond structures

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Nanocrystalline diamond coating of fusion plasma facing components

Cited by 33 publications

References 21 publications

Negative-ion production on carbon materials in hydrogen plasma: influence of the carbon hybridization state and the hydrogen content on H−yield

Negative-ion production on carbon materials in hydrogen plasma: influence of the carbon hybridization state and the hydrogen content on H−yield

Nanocrystalline diamond coatings on the interior of WC–Co dies for drawing carbon steel tubes: Enhancement of tube properties

Characterization of the surface acoustic wave devices based on ZnO/nanocrystalline diamond structures

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Negative-ion production on carbon materials in hydrogen plasma: influence of the carbon hybridization state and the hydrogen content on H⁻yield

Negative-ion production on carbon materials in hydrogen plasma: influence of the carbon hybridization state and the hydrogen content on H⁻yield